fix pip screen bugs

iosApp/iosApp.xcodeproj/project.pbxproj

@@ -7,10 +7,8 @@
 	objects = {
 
 /* Begin PBXBuildFile section */
-		02E790E4779E846963D3DC78 /* PipScreenView.swift in Sources */ = {isa = PBXBuildFile; fileRef = 0480DE3601E8C37A2D4745EA /* PipScreenView.swift */; };
 		22EA1CB33A17DCC6FC82406D /* Assets.xcassets in Resources */ = {isa = PBXBuildFile; fileRef = F543015C899423D4B01CEB2E /* Assets.xcassets */; };
 		2D0291E964949C7C8D4DF324 /* Assets.xcassets in Resources */ = {isa = PBXBuildFile; fileRef = 88A292AA7607F14E8C66291E /* Assets.xcassets */; };
-		4701F6E8155C8E093C8CF81B /* GradientView.swift in Sources */ = {isa = PBXBuildFile; fileRef = 4B8F846972E53BC33C1001D3 /* GradientView.swift */; };
 		56B0305B5D3847FC6B326502 /* ContentView.swift in Sources */ = {isa = PBXBuildFile; fileRef = CE8509E5A49E4A5CAAEB3ADB /* ContentView.swift */; };
 		5A902F589276392B4CBC0015 /* HomeWidgetExampleBundle.swift in Sources */ = {isa = PBXBuildFile; fileRef = 30942AA1A2E3A1AB832DD959 /* HomeWidgetExampleBundle.swift */; };
 		76ED3117C0B97CD5572EB808 /* HomeWidgetExample.swift in Sources */ = {isa = PBXBuildFile; fileRef = B8B1CCBD46108D407DF0C9A3 /* HomeWidgetExample.swift */; };
@@ -22,7 +20,6 @@
 		93FF51B22016695CB74F0AD6 /* HostBridge.swift in Sources */ = {isa = PBXBuildFile; fileRef = 7B6B3C131D45A3E52B69B531 /* HostBridge.swift */; };
 		A59815941DC5A1C2B9F349CB /* PipScreenManager.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2016716493FA6F4B6E30EB17 /* PipScreenManager.swift */; };
 		C8353E6C8BE98C27FD768A59 /* WidgetExtension.appex in Embed Foundation Extensions */ = {isa = PBXBuildFile; fileRef = E6AF7C77765E074EE1C7E597 /* WidgetExtension.appex */; settings = {ATTRIBUTES = (RemoveHeadersOnCopy, ); }; };
-		EAC4398962E17AAE02F2DB68 /* black.mp4 in Resources */ = {isa = PBXBuildFile; fileRef = E2D6A135D7E87F67C8285D07 /* black.mp4 */; };
 		F9A23E2F5F7514E5D6A3D9C0 /* BackgroundIntent.swift in Sources */ = {isa = PBXBuildFile; fileRef = 59CDB1C6A666078B3272B409 /* BackgroundIntent.swift */; };
 		FA6C12E55F9D41237B4BDAF1 /* CarPlaySceneDelegate.swift in Sources */ = {isa = PBXBuildFile; fileRef = 310E847101B97B7A36776025 /* CarPlaySceneDelegate.swift */; };
 		FDE52B8D57A097A60A4CF366 /* AppDelegate.swift in Sources */ = {isa = PBXBuildFile; fileRef = 8B6C1F485E0CF8BB70C9DDD2 /* AppDelegate.swift */; };
@@ -60,12 +57,10 @@
 		0142951DE661E55DC3207327 /* WidgetAppUtils.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = WidgetAppUtils.swift; sourceTree = "<group>"; };
 		A1B2C3D4E5F6789012345678 /* InAppWebViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = InAppWebViewController.swift; sourceTree = "<group>"; };
 		B2C3D4E5F67890123456789 /* WebViewContentBlocker.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = WebViewContentBlocker.swift; sourceTree = "<group>"; };
-		0480DE3601E8C37A2D4745EA /* PipScreenView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = PipScreenView.swift; sourceTree = "<group>"; };
 		1285E8A7B7E7359EA11B9591 /* SceneDelegate.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SceneDelegate.swift; sourceTree = "<group>"; };
 		2016716493FA6F4B6E30EB17 /* PipScreenManager.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = PipScreenManager.swift; sourceTree = "<group>"; };
 		30942AA1A2E3A1AB832DD959 /* HomeWidgetExampleBundle.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = HomeWidgetExampleBundle.swift; sourceTree = "<group>"; };
 		310E847101B97B7A36776025 /* CarPlaySceneDelegate.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = CarPlaySceneDelegate.swift; sourceTree = "<group>"; };
-		4B8F846972E53BC33C1001D3 /* GradientView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = GradientView.swift; sourceTree = "<group>"; };
 		59CDB1C6A666078B3272B409 /* BackgroundIntent.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = BackgroundIntent.swift; sourceTree = "<group>"; };
 		7B6B3C131D45A3E52B69B531 /* HostBridge.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = HostBridge.swift; sourceTree = "<group>"; };
 		86038AE1032E284E79B32AD6 /* iosApp.app */ = {isa = PBXFileReference; includeInIndex = 0; lastKnownFileType = wrapper.application; path = iosApp.app; sourceTree = BUILT_PRODUCTS_DIR; };
@@ -73,7 +68,6 @@
 		8B6C1F485E0CF8BB70C9DDD2 /* AppDelegate.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AppDelegate.swift; sourceTree = "<group>"; };
 		B8B1CCBD46108D407DF0C9A3 /* HomeWidgetExample.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = HomeWidgetExample.swift; sourceTree = "<group>"; };
 		CE8509E5A49E4A5CAAEB3ADB /* ContentView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ContentView.swift; sourceTree = "<group>"; };
-		E2D6A135D7E87F67C8285D07 /* black.mp4 */ = {isa = PBXFileReference; path = black.mp4; sourceTree = "<group>"; };
 		E6AF7C77765E074EE1C7E597 /* WidgetExtension.appex */ = {isa = PBXFileReference; includeInIndex = 0; lastKnownFileType = "wrapper.app-extension"; path = WidgetExtension.appex; sourceTree = BUILT_PRODUCTS_DIR; };
 		F543015C899423D4B01CEB2E /* Assets.xcassets */ = {isa = PBXFileReference; lastKnownFileType = folder.assetcatalog; path = Assets.xcassets; sourceTree = "<group>"; };
 		D1E2F3A4B5C60718293A4B01 /* QqShareHost.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = QqShareHost.swift; sourceTree = "<group>"; };
@@ -137,10 +131,7 @@
 		5B4BD3733F8124940306FE19 /* pip */ = {
 			isa = PBXGroup;
 			children = (
-				E2D6A135D7E87F67C8285D07 /* black.mp4 */,
-				4B8F846972E53BC33C1001D3 /* GradientView.swift */,
 				2016716493FA6F4B6E30EB17 /* PipScreenManager.swift */,
-				0480DE3601E8C37A2D4745EA /* PipScreenView.swift */,
 			);
 			path = pip;
 			sourceTree = "<group>";
@@ -265,7 +256,6 @@
 			buildActionMask = 2147483647;
 			files = (
 				22EA1CB33A17DCC6FC82406D /* Assets.xcassets in Resources */,
-				EAC4398962E17AAE02F2DB68 /* black.mp4 in Resources */,
 				D1E2F3A4B5C60718293A4B06 /* TencentOpenApi_IOS_Bundle.bundle in Resources */,
 				I18N0PLIST0BUILD0FILE001 /* InfoPlist.strings in Resources */,
 			);
@@ -344,10 +334,8 @@
 				FDE52B8D57A097A60A4CF366 /* AppDelegate.swift in Sources */,
 				FA6C12E55F9D41237B4BDAF1 /* CarPlaySceneDelegate.swift in Sources */,
 				56B0305B5D3847FC6B326502 /* ContentView.swift in Sources */,
-				4701F6E8155C8E093C8CF81B /* GradientView.swift in Sources */,
 				93FF51B22016695CB74F0AD6 /* HostBridge.swift in Sources */,
 				A59815941DC5A1C2B9F349CB /* PipScreenManager.swift in Sources */,
-				02E790E4779E846963D3DC78 /* PipScreenView.swift in Sources */,
 				88ABACE0259DE83261737B99 /* SceneDelegate.swift in Sources */,
 				8070A4B4DD1D3DD823A8F923 /* WidgetAppUtils.swift in Sources */,
 				B7C8D9E0F1A234567890ABCD /* InAppWebViewController.swift in Sources */,

iosApp/iosApp.xcodeproj/xcshareddata/xcodecloud/manifest.json

@@ -0,0 +1,9 @@
+{
+  "id" : "97ba7140-7c52-4fdd-9ed8-e5a5fd628d17",
+  "targets" : [
+    {
+      "id" : "DD6B14F5-41C7-48A4-AA91-5E72470E1514",
+      "name" : "LLMP"
+    }
+  ]
+}

iosApp/iosApp/AppDelegate.swift

@@ -1,3 +1,4 @@
+import AVFoundation
 import UIKit
 import WidgetKit
 
@@ -93,9 +94,39 @@ class AppDelegate: UIResponder, UIApplicationDelegate {
             guard let message = notification.userInfo?["message"] as? String else { return }
             HostBridge.shared.showToast(message)
         }
+        NotificationCenter.default.addObserver(
+            forName: Notification.Name("llmpPrepareAudioSession"),
+            object: nil,
+            queue: .main
+        ) { [weak self] _ in
+            self?.activatePlaybackSession()
+        }
         QqShareHost.shared.prepare()
     }
 
+    /// iOS 27 起主线程同步 setActive 会报 Hang Risk，改走异步激活。
+    private func activatePlaybackSession() {
+        let session = AVAudioSession.sharedInstance()
+        try? session.setCategory(.playback)
+        if #available(iOS 27.0, *) {
+            session.activate(options: []) { activated, error in
+                DispatchQueue.main.async {
+                    NotificationCenter.default.post(
+                        name: Notification.Name("llmpAudioSessionReady"),
+                        object: nil,
+                        userInfo: ["ok": activated && error == nil]
+                    )
+                }
+            }
+        } else {
+            try? session.setActive(true)
+            NotificationCenter.default.post(
+                name: Notification.Name("llmpAudioSessionReady"),
+                object: nil
+            )
+        }
+    }
+
     func application(
         _ app: UIApplication,
         open url: URL,

iosApp/iosApp/SceneDelegate.swift

@@ -27,8 +27,19 @@ class SceneDelegate: UIResponder, UIWindowSceneDelegate {
         }
     }
 
+    func sceneWillResignActive(_ scene: UIScene) {
+        // 键盘还在时，系统会把键盘场景挂到画中画上；连接一旦被拆掉就会报 scene 不存在。
+        window?.endEditing(true)
+        let defaults = UserDefaults(suiteName: "group.com.zhushenwudi.lovelivemusicplayer")
+        let playing = defaults?.bool(forKey: "pipIsPlaying") ?? false
+        let enabled = defaults?.bool(forKey: "desktopLyricEnabled") ?? false
+        if playing && enabled {
+            pipManager.manualChangePicInPic(needStart: true)
+        }
+    }
+
     func sceneDidBecomeActive(_ scene: UIScene) {
-        // 前台不显示桌面歌词：关掉 PiP，但播放中仍保持 dummy，方便下次进后台自动弹出。
+        // 前台不显示桌面歌词。开关仍开着时，下次进后台再弹出。
         pipManager.stopPictureInPictureOnly()
         let defaults = UserDefaults(suiteName: "group.com.zhushenwudi.lovelivemusicplayer")
         let playing = defaults?.bool(forKey: "pipIsPlaying") ?? false
@@ -86,7 +97,6 @@ class SceneDelegate: UIResponder, UIWindowSceneDelegate {
                     self.pipManager.manualChangePicInPic(needStart: false)
                 }
             case "show":
-                self.pipManager.picInPicAutoOpen(nil)
                 self.pipManager.manualChangePicInPic(needStart: true)
             case "hide":
                 self.pipManager.stopPictureInPictureOnly()

iosApp/iosApp/pip/GradientView.swift

@@ -1,55 +0,0 @@
-import UIKit
-
-class GradientLayer: CAGradientLayer {
-    private static let animationKey = "moveAnimation"
-
-    let colorOne = UIColor(red: 0.24, green: 0.67, blue: 0.97, alpha: 1).cgColor
-    let colorTwo = UIColor(red: 0.81, green: 0.03, blue: 0.33, alpha: 1).cgColor
-    let colorThree = UIColor(red: 0.96, green: 0.71, blue: 0.20, alpha: 1).cgColor
-
-    var currentGradient = 0
-    var gradientSet = [[CGColor]]()
-
-    func animateGradient() {
-        guard !gradientSet.isEmpty else { return }
-        guard animation(forKey: Self.animationKey) == nil else { return }
-
-        colors = gradientSet[currentGradient]
-        let keyframes = CAKeyframeAnimation(keyPath: "colors")
-        keyframes.values = gradientSet + [gradientSet[0]]
-        keyframes.keyTimes = [
-            NSNumber(value: 0),
-            NSNumber(value: 1.0 / 3.0),
-            NSNumber(value: 2.0 / 3.0),
-            NSNumber(value: 1),
-        ]
-        keyframes.duration = 15
-        keyframes.repeatCount = .infinity
-        keyframes.calculationMode = .linear
-        keyframes.isRemovedOnCompletion = false
-        add(keyframes, forKey: Self.animationKey)
-    }
-
-    func createGradientView() {
-        gradientSet = [
-            [colorOne, colorTwo],
-            [colorTwo, colorThree],
-            [colorThree, colorOne],
-        ]
-        currentGradient = 0
-        colors = gradientSet[currentGradient]
-        startPoint = CGPoint(x: 0, y: 0)
-        endPoint = CGPoint(x: 1, y: 1)
-        drawsAsynchronously = true
-    }
-
-    func removeAnimation() {
-        removeAnimation(forKey: Self.animationKey)
-    }
-
-    /// Core Animation 在锁屏时可能丢弃动画，解锁后显式重建。
-    func restartAnimation() {
-        removeAnimation()
-        animateGradient()
-    }
-}

iosApp/iosApp/pip/PipScreenManager.swift

@@ -1,211 +1,83 @@
+import AVFoundation
 import AVKit
+import CoreMedia
+import CoreVideo
 import UIKit
 
 @MainActor
-class PipScreenManager: NSObject, @preconcurrency AVPictureInPictureControllerDelegate {
+class PipScreenManager: NSObject, @preconcurrency AVPictureInPictureControllerDelegate, AVPictureInPictureSampleBufferPlaybackDelegate {
-    // 4:1 能保持最大宽度，同时比 5:1 的歌词条更接近原来的高度。
+    private static let renderSize = CGSize(width: 800, height: 200)
-    private static let pipAspectRatio: CGFloat = 2000.0 / 500.0
 
-    private var firstWindow: UIWindow?
     private var pipController: AVPictureInPictureController?
     private let sourceView = UIView()
-    private var sourceHeightConstraint: NSLayoutConstraint?
+    private let sampleHost = SampleBufferHostView()
-    private var picInPicView = PipScreenView()
-    private var isOpenPicInPic = false
-    private var suspectedWindows: [UIWindow] = []
     private var didPrepare = false
-
+    private var wantsPip = false
-    override init() {
+    private var isOpenPicInPic = false
-        super.init()
+    private var isStartingPip = false
-        isOpenPicInPic = false
+    private var timebase: CMTimebase?
-    }
+    private var line1 = ""
-
+    private var line2 = ""
-    deinit {
+    private var currentLine = -1
-        NotificationCenter.default.removeObserver(self)
-    }
 
     func addScreenView(on view: UIView) {
-        if sourceView.superview !== view {
+        guard sourceView.superview !== view else {
+            if !didPrepare { preparePicInPic() }
+            return
+        }
         sourceView.removeFromSuperview()
         sourceView.backgroundColor = .clear
         sourceView.isUserInteractionEnabled = false
         sourceView.clipsToBounds = true
         sourceView.translatesAutoresizingMaskIntoConstraints = false
-            // 放在 UIWindow 最底层：仍处于可视区域，可触发自动 PiP，但不会盖住 App。
+        view.addSubview(sourceView)
-            view.insertSubview(sourceView, at: 0)
+        sampleHost.translatesAutoresizingMaskIntoConstraints = false
-            let height = sourceView.heightAnchor.constraint(
+        sampleHost.isUserInteractionEnabled = false
-                equalTo: sourceView.widthAnchor,
+        sourceView.addSubview(sampleHost)
-                multiplier: 1.0 / Self.pipAspectRatio
-            )
-            sourceHeightConstraint = height
         NSLayoutConstraint.activate([
             sourceView.leadingAnchor.constraint(equalTo: view.leadingAnchor),
             sourceView.trailingAnchor.constraint(equalTo: view.trailingAnchor),
             sourceView.bottomAnchor.constraint(equalTo: view.bottomAnchor),
-                height,
+            sourceView.heightAnchor.constraint(equalToConstant: 1),
+            sampleHost.leadingAnchor.constraint(equalTo: sourceView.leadingAnchor),
+            sampleHost.trailingAnchor.constraint(equalTo: sourceView.trailingAnchor),
+            sampleHost.topAnchor.constraint(equalTo: sourceView.topAnchor),
+            sampleHost.bottomAnchor.constraint(equalTo: sourceView.bottomAnchor),
         ])
-        }
         view.layoutIfNeeded()
-        if !didPrepare {
+        if !didPrepare { preparePicInPic() }
-            preparePicInPic(on: sourceView)
-        } else {
-            pipController?.playerLayer.frame = sourceView.bounds
-        }
     }
 
     func removeScreenView() {
+        wantsPip = false
         sourceView.removeFromSuperview()
-        sourceHeightConstraint = nil
-        NotificationCenter.default.removeObserver(self)
-        suspectedWindows.removeAll()
-    }
-
-    private func preparePicInPic(on view: UIView) {
-        do {
-            try AVAudioSession.sharedInstance().setCategory(.playback)
-            try AVAudioSession.sharedInstance().setActive(true)
-        } catch {
-            print("Error setting up audio session: \(error)")
-        }
-
-        guard let url = Bundle.main.url(forResource: "black", withExtension: "mp4") else {
-            print("Missing black.mp4 in app bundle — add from Flutter ios/Runner or create a 1-frame black video.")
-            return
-        }
-
-        let item = AVPlayerItem(asset: AVAsset(url: url))
-        let player = AVPlayer(playerItem: item)
-        let playerLayer = AVPlayerLayer(player: player)
-        view.layoutIfNeeded()
-        playerLayer.frame = view.bounds
-        playerLayer.backgroundColor = UIColor.black.cgColor
-        playerLayer.videoGravity = .resizeAspectFill
-        view.layer.insertSublayer(playerLayer, at: 0)
-
-        pipController = AVPictureInPictureController(playerLayer: playerLayer)
-        if #available(iOS 14.0, *) {
-            pipController?.requiresLinearPlayback = true
-        }
-        pipController?.setValue(1, forKey: "controlsStyle")
-        pipController?.delegate = self
-        if #available(iOS 14.2, *) {
-            pipController?.canStartPictureInPictureAutomaticallyFromInline = true
-        }
-        didPrepare = true
-
-        NotificationCenter.default.addObserver(
-            self,
-            selector: #selector(playerItemDidReachEnd),
-            name: .AVPlayerItemDidPlayToEndTime,
-            object: nil
-        )
-        NotificationCenter.default.addObserver(
-            self,
-            selector: #selector(windowDidBecomeVisible),
-            name: UIWindow.didBecomeVisibleNotification,
-            object: nil
-        )
-        for name in [
-            UIApplication.didEnterBackgroundNotification,
-            UIApplication.willEnterForegroundNotification,
-            UIApplication.didBecomeActiveNotification,
-            UIApplication.protectedDataDidBecomeAvailableNotification,
-            UIApplication.significantTimeChangeNotification,
-        ] {
-            NotificationCenter.default.addObserver(
-                self,
-                selector: #selector(applicationLifecycleDidChange),
-                name: name,
-                object: nil
-            )
-        }
     }
 
     func picInPicAutoOpen(_ isOpen: Bool?) {
         if let isOpen { isOpenPicInPic = isOpen }
-        let isPlayingNow = pipController?.playerLayer.player?.timeControlStatus == .playing
+        if isOpenPicInPic { enqueueCurrentFrame() }
-        if isOpenPicInPic {
-            if !isPlayingNow { pipController?.playerLayer.player?.play() }
-        } else if isPlayingNow {
-            pipController?.playerLayer.player?.pause()
-        }
     }
 
     @objc func updatePipScreenView(lyricLine1: String?, lyricLine2: String?, currentLine: Int) {
-        picInPicView.updateContent(lyricLine1: lyricLine1, lyricLine2: lyricLine2, currentLine: currentLine)
+        if let lyricLine1 { line1 = lyricLine1 }
-    }
+        if let lyricLine2 { line2 = lyricLine2 }
-
+        self.currentLine = currentLine
-    @objc private func windowDidBecomeVisible(notification: Notification) {
+        enqueueCurrentFrame()
-        guard let object = notification.object else { return }
-        if String(describing: type(of: object)) == "PGHostedWindow" {
-            firstWindow = notification.object as? UIWindow
-            NotificationCenter.default.removeObserver(self, name: UIWindow.didBecomeVisibleNotification, object: nil)
-            restartPipRendering()
-        } else if let targetWindow = object as? UIWindow {
-            suspectedWindows.append(targetWindow)
-        }
-    }
-
-    @objc private func applicationLifecycleDidChange(_ notification: Notification) {
-        restartPipRendering()
-    }
-
-    private func restartPipRendering() {
-        if isOpenPicInPic,
-            pipController?.playerLayer.player?.timeControlStatus != .playing
-        {
-            pipController?.playerLayer.player?.play()
-        }
-
-        picInPicView.setNeedsLayout()
-        picInPicView.layoutIfNeeded()
-        picInPicView.gradientLayer.restartAnimation()
-
-        // 解锁后 PGHostedWindow 会异步恢复，再补一次以避开系统重建窗口的时序。
-        Task { @MainActor [weak self] in
-            try? await Task.sleep(nanoseconds: 300_000_000)
-            guard let self else { return }
-            self.picInPicView.setNeedsLayout()
-            self.picInPicView.layoutIfNeeded()
-            self.picInPicView.gradientLayer.restartAnimation()
-        }
-    }
-
-    private func filterTargetWindow() -> UIWindow? {
-        for window in suspectedWindows where String(describing: type(of: window)) == "PGHostedWindow" {
-            return window
-        }
-        for window in suspectedWindows where window.windowLevel == UIWindow.Level(rawValue: -10_000_000) {
-            return window
-        }
-        for window in suspectedWindows where window.frame.size.height < 300 {
-            return window
-        }
-        return suspectedWindows.first
-    }
-
-    @objc private func playerItemDidReachEnd(notification: Notification) {
-        guard let item = notification.object as? AVPlayerItem,
-            item === pipController?.playerLayer.player?.currentItem
-        else { return }
-        pipController?.playerLayer.player?.seek(to: .zero)
-        pipController?.playerLayer.player?.play()
     }
 
     func manualChangePicInPic(needStart: Bool) {
         if needStart {
-            pipController?.playerLayer.player?.play()
+            wantsPip = true
-            if pipController?.isPictureInPictureActive == false {
+            isOpenPicInPic = true
-                pipController?.startPictureInPicture()
+            pipController?.invalidatePlaybackState()
-            }
+            startPipIfPossible(retries: 8)
         } else {
             stopPictureInPictureOnly()
-            pipController?.playerLayer.player?.pause()
         }
     }
 
-    /// 只关 PiP，dummy player 继续播，方便下次进后台自动弹出。
     func stopPictureInPictureOnly() {
+        wantsPip = false
         if pipController?.isPictureInPictureActive == true {
             pipController?.stopPictureInPicture()
         }
@@ -214,20 +86,250 @@ class PipScreenManager: NSObject, @preconcurrency AVPictureInPictureControllerDe
     func pictureInPictureControllerDidStartPictureInPicture(
         _ pictureInPictureController: AVPictureInPictureController
     ) {
-        if firstWindow == nil {
+        isStartingPip = false
-            firstWindow = filterTargetWindow()
+        if !wantsPip {
-            suspectedWindows.removeAll()
+            pictureInPictureController.stopPictureInPicture()
+            return
         }
-        if let firstWindow {
+        enqueueCurrentFrame()
-            firstWindow.addSubview(picInPicView)
-            picInPicView.translatesAutoresizingMaskIntoConstraints = false
-            NSLayoutConstraint.activate([
-                picInPicView.topAnchor.constraint(equalTo: firstWindow.topAnchor),
-                picInPicView.leadingAnchor.constraint(equalTo: firstWindow.leadingAnchor),
-                picInPicView.trailingAnchor.constraint(equalTo: firstWindow.trailingAnchor),
-                picInPicView.bottomAnchor.constraint(equalTo: firstWindow.bottomAnchor),
-            ])
     }
-        restartPipRendering()
+
+    func pictureInPictureController(
+        _ pictureInPictureController: AVPictureInPictureController,
+        failedToStartPictureInPictureWithError error: Error
+    ) {
+        isStartingPip = false
+        print("PiP failed to start: \(error)")
+    }
+
+    func pictureInPictureController(
+        _ pictureInPictureController: AVPictureInPictureController,
+        setPlaying playing: Bool
+    ) {
+        if playing { enqueueCurrentFrame() }
+    }
+
+    func pictureInPictureControllerTimeRangeForPlayback(
+        _ pictureInPictureController: AVPictureInPictureController
+    ) -> CMTimeRange {
+        CMTimeRange(start: .zero, duration: .positiveInfinity)
+    }
+
+    func pictureInPictureControllerIsPlaybackPaused(
+        _ pictureInPictureController: AVPictureInPictureController
+    ) -> Bool {
+        !isOpenPicInPic
+    }
+
+    func pictureInPictureController(
+        _ pictureInPictureController: AVPictureInPictureController,
+        didTransitionToRenderSize newRenderSize: CMVideoDimensions
+    ) {
+        enqueueCurrentFrame()
+    }
+
+    func pictureInPictureController(
+        _ pictureInPictureController: AVPictureInPictureController,
+        skipByInterval skipInterval: CMTime,
+        completion completionHandler: @escaping () -> Void
+    ) {
+        completionHandler()
+    }
+
+    private func preparePicInPic() {
+        let layer = sampleHost.sampleLayer
+        layer.videoGravity = .resizeAspect
+        layer.backgroundColor = UIColor.black.cgColor
+        if let timebase = makeHostTimebase() {
+            self.timebase = timebase
+            layer.controlTimebase = timebase
+        }
+        enqueueCurrentFrame()
+
+        let controller = AVPictureInPictureController(contentSource: AVPictureInPictureController.ContentSource(
+            sampleBufferDisplayLayer: layer,
+            playbackDelegate: self
+        ))
+        controller.requiresLinearPlayback = true
+        controller.setValue(1, forKey: "controlsStyle")
+        controller.delegate = self
+        // 自动开启会和 sceneWillResignActive 里的手动开启抢同一次系统连接，快速上滑时连接会被拆掉。
+        controller.canStartPictureInPictureAutomaticallyFromInline = false
+        pipController = controller
+        didPrepare = true
+    }
+
+    /// 必须在还没进后台时同步调用。启动过程中再调一次会拆掉系统连接。
+    private func startPipIfPossible(retries: Int) {
+        guard wantsPip, let pip = pipController else { return }
+        if pip.isPictureInPictureActive || isStartingPip { return }
+        guard UIApplication.shared.applicationState != .background else { return }
+        guard pip.isPictureInPicturePossible else {
+            if retries > 0 {
+                DispatchQueue.main.async { [weak self] in
+                    self?.startPipIfPossible(retries: retries - 1)
+                }
+            } else {
+                print("PiP not possible after retries")
+            }
+            return
+        }
+        isStartingPip = true
+        pip.startPictureInPicture()
+    }
+
+    private func enqueueCurrentFrame() {
+        if isStartingPip { return }
+        guard didPrepare || sampleHost.superview != nil else { return }
+        guard let pixelBuffer = makePixelBuffer(size: Self.renderSize) else { return }
+        CVPixelBufferLockBaseAddress(pixelBuffer, [])
+        if let context = CGContext(
+            data: CVPixelBufferGetBaseAddress(pixelBuffer),
+            width: CVPixelBufferGetWidth(pixelBuffer),
+            height: CVPixelBufferGetHeight(pixelBuffer),
+            bitsPerComponent: 8,
+            bytesPerRow: CVPixelBufferGetBytesPerRow(pixelBuffer),
+            space: CGColorSpaceCreateDeviceRGB(),
+            bitmapInfo: CGImageAlphaInfo.premultipliedFirst.rawValue | CGBitmapInfo.byteOrder32Little.rawValue
+        ) {
+            let height = CGFloat(CVPixelBufferGetHeight(pixelBuffer))
+            let width = CGFloat(CVPixelBufferGetWidth(pixelBuffer))
+            context.translateBy(x: 0, y: height)
+            context.scaleBy(x: 1, y: -1)
+            context.scaleBy(x: width / Self.renderSize.width, y: height / Self.renderSize.height)
+            drawLyrics(in: context, size: Self.renderSize)
+        }
+        CVPixelBufferUnlockBaseAddress(pixelBuffer, [])
+
+        let pts = timebase.map { CMTimebaseGetTime($0) } ?? .zero
+        guard let sample = makeSampleBuffer(from: pixelBuffer, pts: pts) else { return }
+        markDisplayImmediately(sample)
+        let layer = sampleHost.sampleLayer
+        if layer.status == .failed {
+            layer.flush()
+        }
+        guard layer.isReadyForMoreMediaData else { return }
+        layer.enqueue(sample)
+    }
+
+    private func drawLyrics(in context: CGContext, size: CGSize) {
+        UIGraphicsPushContext(context)
+        UIColor.black.setFill()
+        UIRectFill(CGRect(origin: .zero, size: size))
+        let font = UIFont.boldSystemFont(ofSize: 34)
+        let style = NSMutableParagraphStyle()
+        style.lineBreakMode = .byTruncatingTail
+        let primary = UIColor.white
+        let dim = UIColor.white.withAlphaComponent(0.45)
+        let textWidth = size.width - 48
+        if currentLine == -1 {
+            let shown = line1.isEmpty ? " " : line1
+            (shown as NSString).draw(
+                in: CGRect(x: 24, y: (size.height - 48) / 2, width: textWidth, height: 48),
+                withAttributes: [.font: font, .foregroundColor: primary, .paragraphStyle: style]
+            )
+        } else {
+            (line1 as NSString).draw(
+                in: CGRect(x: 24, y: 36, width: textWidth, height: 56),
+                withAttributes: [
+                    .font: font,
+                    .foregroundColor: currentLine == 2 ? dim : primary,
+                    .paragraphStyle: style,
+                ]
+            )
+            (line2 as NSString).draw(
+                in: CGRect(x: 24, y: 108, width: textWidth, height: 56),
+                withAttributes: [
+                    .font: font,
+                    .foregroundColor: currentLine == 1 ? dim : primary,
+                    .paragraphStyle: style,
+                ]
+            )
+        }
+        UIGraphicsPopContext()
+    }
+
+    private func markDisplayImmediately(_ sample: CMSampleBuffer) {
+        guard let attachments = CMSampleBufferGetSampleAttachmentsArray(sample, createIfNecessary: true),
+              CFArrayGetCount(attachments) > 0 else { return }
+        let dict = unsafeBitCast(CFArrayGetValueAtIndex(attachments, 0), to: CFMutableDictionary.self)
+        CFDictionarySetValue(
+            dict,
+            Unmanaged.passUnretained(kCMSampleAttachmentKey_DisplayImmediately as NSString).toOpaque(),
+            Unmanaged.passUnretained(kCFBooleanTrue).toOpaque()
+        )
+    }
+
+    private func makeHostTimebase() -> CMTimebase? {
+        var timebase: CMTimebase?
+        let status = CMTimebaseCreateWithSourceClock(
+            allocator: kCFAllocatorDefault,
+            sourceClock: CMClockGetHostTimeClock(),
+            timebaseOut: &timebase
+        )
+        guard status == noErr, let timebase else { return nil }
+        CMTimebaseSetTime(timebase, time: .zero)
+        CMTimebaseSetRate(timebase, rate: 1)
+        return timebase
+    }
+
+    private func makePixelBuffer(size: CGSize) -> CVPixelBuffer? {
+        let width = evenPixel(size.width)
+        let height = evenPixel(size.height)
+        guard width > 0, height > 0 else { return nil }
+        let attrs: [CFString: Any] = [
+            kCVPixelBufferCGImageCompatibilityKey: true,
+            kCVPixelBufferCGBitmapContextCompatibilityKey: true,
+            kCVPixelBufferIOSurfacePropertiesKey: [:] as CFDictionary,
+        ]
+        var pixelBuffer: CVPixelBuffer?
+        let status = CVPixelBufferCreate(
+            kCFAllocatorDefault,
+            width,
+            height,
+            kCVPixelFormatType_32BGRA,
+            attrs as CFDictionary,
+            &pixelBuffer
+        )
+        guard status == kCVReturnSuccess else { return nil }
+        return pixelBuffer
+    }
+
+    private func makeSampleBuffer(from pixelBuffer: CVPixelBuffer, pts: CMTime) -> CMSampleBuffer? {
+        var format: CMVideoFormatDescription?
+        let formatStatus = CMVideoFormatDescriptionCreateForImageBuffer(
+            allocator: kCFAllocatorDefault,
+            imageBuffer: pixelBuffer,
+            formatDescriptionOut: &format
+        )
+        guard formatStatus == noErr, let format else { return nil }
+        var timing = CMSampleTimingInfo(
+            duration: CMTime(value: 1, timescale: 30),
+            presentationTimeStamp: pts,
+            decodeTimeStamp: .invalid
+        )
+        var sample: CMSampleBuffer?
+        let status = CMSampleBufferCreateReadyWithImageBuffer(
+            allocator: kCFAllocatorDefault,
+            imageBuffer: pixelBuffer,
+            formatDescription: format,
+            sampleTiming: &timing,
+            sampleBufferOut: &sample
+        )
+        guard status == noErr else { return nil }
+        return sample
+    }
+
+    private func evenPixel(_ value: CGFloat) -> Int {
+        let rounded = max(Int(value.rounded()), 2)
+        return rounded.isMultiple(of: 2) ? rounded : rounded - 1
+    }
+}
+
+private final class SampleBufferHostView: UIView {
+    override class var layerClass: AnyClass { AVSampleBufferDisplayLayer.self }
+
+    var sampleLayer: AVSampleBufferDisplayLayer {
+        layer as! AVSampleBufferDisplayLayer
     }
 }

iosApp/iosApp/pip/PipScreenView.swift

@@ -1,110 +0,0 @@
-import UIKit
-
-class PipScreenView: UIView {
-    private let bgView = UIView()
-    private var lyricLine1 = UITextView()
-    private var lyricLine2 = UITextView()
-    private var noLyricLine = UITextView()
-    private var icon = UIImageView(image: UIImage(named: "AppIcon"))
-
-    let gradientLayer = GradientLayer()
-
-    override init(frame: CGRect) {
-        super.init(frame: frame)
-        setupView()
-    }
-
-    required init?(coder: NSCoder) {
-        super.init(coder: coder)
-        setupView()
-    }
-
-    private func setupView() {
-        backgroundColor = .clear
-        layer.cornerRadius = 8
-        layer.masksToBounds = true
-        translatesAutoresizingMaskIntoConstraints = false
-
-        bgView.translatesAutoresizingMaskIntoConstraints = false
-        addSubview(bgView)
-
-        gradientLayer.createGradientView()
-        layer.insertSublayer(gradientLayer, at: 0)
-
-        for line in [lyricLine1, lyricLine2, noLyricLine] {
-            line.backgroundColor = .clear
-            line.textColor = .white
-            line.translatesAutoresizingMaskIntoConstraints = false
-            line.isScrollEnabled = false
-            line.isEditable = false
-        }
-        noLyricLine.textAlignment = .center
-        noLyricLine.isHidden = true
-
-        let font = UIFont.boldSystemFont(ofSize: 18)
-        lyricLine1.font = font
-        lyricLine2.font = font
-        noLyricLine.font = font
-
-        bgView.addSubview(lyricLine1)
-        bgView.addSubview(lyricLine2)
-        bgView.addSubview(noLyricLine)
-
-        icon.contentMode = .scaleAspectFit
-        icon.translatesAutoresizingMaskIntoConstraints = false
-        bgView.addSubview(icon)
-
-        NSLayoutConstraint.activate([
-            bgView.topAnchor.constraint(equalTo: topAnchor),
-            bgView.leadingAnchor.constraint(equalTo: leadingAnchor),
-            bgView.trailingAnchor.constraint(equalTo: trailingAnchor),
-            bgView.bottomAnchor.constraint(equalTo: bottomAnchor),
-
-            lyricLine1.topAnchor.constraint(equalTo: bgView.topAnchor, constant: 2),
-            lyricLine1.leadingAnchor.constraint(equalTo: bgView.leadingAnchor, constant: 10),
-            lyricLine1.trailingAnchor.constraint(equalTo: bgView.trailingAnchor, constant: -10),
-            lyricLine1.heightAnchor.constraint(equalToConstant: 55),
-
-            lyricLine2.topAnchor.constraint(equalTo: lyricLine1.bottomAnchor, constant: 2),
-            lyricLine2.leadingAnchor.constraint(equalTo: bgView.leadingAnchor, constant: 10),
-            lyricLine2.trailingAnchor.constraint(equalTo: bgView.trailingAnchor, constant: -10),
-            lyricLine2.heightAnchor.constraint(equalToConstant: 55),
-
-            noLyricLine.centerYAnchor.constraint(equalTo: bgView.centerYAnchor),
-            noLyricLine.leadingAnchor.constraint(equalTo: bgView.leadingAnchor),
-            noLyricLine.trailingAnchor.constraint(equalTo: bgView.trailingAnchor),
-            noLyricLine.heightAnchor.constraint(equalToConstant: 38),
-
-            icon.bottomAnchor.constraint(equalTo: bgView.bottomAnchor, constant: -10),
-            icon.trailingAnchor.constraint(equalTo: bgView.trailingAnchor, constant: -10),
-            icon.widthAnchor.constraint(equalToConstant: 30),
-            icon.heightAnchor.constraint(equalToConstant: 30),
-        ])
-    }
-
-    @objc func updateContent(lyricLine1: String?, lyricLine2: String?, currentLine: Int) {
-        if let lyricLine1 { self.lyricLine1.text = lyricLine1 }
-        if let lyricLine2 { self.lyricLine2.text = lyricLine2 }
-        self.lyricLine1.textColor = currentLine == 2
-            ? UIColor.white.withAlphaComponent(0.4) : .white
-        self.lyricLine2.textColor = currentLine == 1
-            ? UIColor.white.withAlphaComponent(0.4) : .white
-
-        if currentLine == -1 {
-            noLyricLine.text = lyricLine1
-            self.lyricLine1.isHidden = true
-            self.lyricLine2.isHidden = true
-            noLyricLine.isHidden = false
-        } else {
-            self.lyricLine1.isHidden = false
-            self.lyricLine2.isHidden = false
-            noLyricLine.isHidden = true
-        }
-    }
-
-    override func layoutSubviews() {
-        super.layoutSubviews()
-        gradientLayer.frame = bounds
-        gradientLayer.animateGradient()
-    }
-}

shared/src/iosMain/kotlin/com/zhushenwudi/lovelivemusicplayer/player/PlayerController.ios.kt

@@ -14,7 +14,6 @@ import kotlinx.coroutines.flow.update
 import kotlinx.coroutines.isActive
 import kotlinx.coroutines.launch
 import platform.AVFAudio.AVAudioSession
-import platform.AVFAudio.AVAudioSessionCategoryPlayback
 import platform.AVFAudio.AVAudioSessionInterruptionNotification
 import platform.AVFAudio.AVAudioSessionInterruptionOptionKey
 import platform.AVFAudio.AVAudioSessionInterruptionOptionShouldResume
@@ -24,7 +23,6 @@ import platform.AVFAudio.AVAudioSessionInterruptionTypeKey
 import platform.AVFAudio.AVAudioSessionRouteChangeNotification
 import platform.AVFAudio.AVAudioSessionRouteChangeReasonKey
 import platform.AVFAudio.AVAudioSessionRouteChangeReasonOldDeviceUnavailable
-import platform.AVFAudio.setActive
 import platform.AVFoundation.AVPlayer
 import platform.AVFoundation.AVPlayerItem
 import platform.AVFoundation.AVPlayerItemDidPlayToEndTimeNotification
@@ -131,6 +129,9 @@ actual class PlayerController {
     private var lastEndMark: TimeSource.Monotonic.ValueTimeMark? = null
 
     private var audioReady = false
+    private var audioActive = false
+    private var playWhenReady = false
+    private var audioSessionReadyObserver: Any? = null
 
     /** CarPlay / 锁屏 Now Playing 标题用的当前歌词；null 表示显示歌名。 */
     private var nowPlayingLyric: String? = null
@@ -143,18 +144,50 @@ actual class PlayerController {
         observePlaybackFailed()
         observeAudioRouteChanges()
         observeAudioInterruptions()
+        observeAudioSessionReady()
     }
 
     private fun ensureAudioReady() {
-        if (audioReady) return
+        if (audioActive || audioReady) return
         audioReady = true
-        runCatching {
-            val session = AVAudioSession.sharedInstance()
-            session.setCategory(AVAudioSessionCategoryPlayback, error = null)
-            session.setActive(true, error = null)
-        }.onFailure { AppLog.e(TAG, "ensureAudioReady session fail", it) }
         runCatching { setupRemoteCommands() }
             .onFailure { AppLog.e(TAG, "ensureAudioReady remoteCommands fail", it) }
+        NSNotificationCenter.defaultCenter.postNotificationName(
+            aName = "llmpPrepareAudioSession",
+            `object` = null,
+            userInfo = null,
+        )
+    }
+
+    private fun observeAudioSessionReady() {
+        audioSessionReadyObserver = NSNotificationCenter.defaultCenter.addObserverForName(
+            name = "llmpAudioSessionReady",
+            `object` = null,
+            queue = null,
+        ) { notification: NSNotification? ->
+            val ok = (notification?.userInfo?.get("ok") as? NSNumber)?.boolValue ?: true
+            dispatch_async(dispatch_get_main_queue()) {
+                if (!ok) {
+                    audioReady = false
+                    playWhenReady = false
+                    AppLog.e(TAG, "audio session activate failed")
+                    if (_state.value.isPlaying) {
+                        player.pause()
+                        _state.update { it.copy(isPlaying = false) }
+                    }
+                    return@dispatch_async
+                }
+                audioActive = true
+                if (playWhenReady && _state.value.isPlaying) {
+                    playWhenReady = false
+                    player.play()
+                    startPositionUpdates()
+                    updateNowPlayingInfo()
+                } else {
+                    playWhenReady = false
+                }
+            }
+        }
     }
 
     private fun setupRemoteCommands() {
@@ -270,7 +303,7 @@ actual class PlayerController {
             queue = null,
         ) { notification: NSNotification? ->
             val ended = notification?.`object` as? AVPlayerItem
-            // 桌面歌词 dummy black.mp4 也会发 DidPlayToEnd；只处理本控制器的音乐 item。
+            // 只处理本控制器的音乐 item。
             // Kotlin/Native 的 === 对 ObjC 对象包装器不可靠，须用 isEqual 比较指针。
             if (ended == null || !isMusicItem(ended)) {
                 return@addObserverForName
@@ -614,17 +647,24 @@ actual class PlayerController {
         ensureAudioReady()
         val current = _state.value.current
         if (loadedUri.isNullOrBlank() && current != null) {
+            playWhenReady = false
             AppLog.e(TAG, "play() abort reason=noLoadedUri id=${current.musicId}")
             _state.update { it.copy(isPlaying = false, error = "No playable URI") }
             return
         }
-        player.play()
         _state.update { it.copy(isPlaying = true, error = null) }
+        if (audioActive) {
+            player.play()
             startPositionUpdates()
             updateNowPlayingInfo()
+        } else {
+            playWhenReady = true
+            updateNowPlayingInfo()
+        }
     }
 
     actual fun pause() {
+        playWhenReady = false
         resumeAfterInterruption = false
         endScrub()
         player.pause()
@@ -908,8 +948,12 @@ actual class PlayerController {
         watchItemStatus(item, path, music)
         if (autoPlay) {
             ensureAudioReady()
+            if (audioActive) {
                 player.play()
                 startPositionUpdates()
+            } else {
+                playWhenReady = true
+            }
         } else {
             player.pause()
             positionJob?.cancel()