fix: QR scanner crash - use independent NSWindow instead of SwiftUI sheet

Sources/MiniPlayerApp.swift

@@ -262,9 +262,6 @@ struct BricksAppView: View {
             .sheet(isPresented: $bridge.showPlaylistSheet) {
                 PlaylistWindowView(bridge: bridge)
             }
-            .sheet(isPresented: $bridge.showQRScanner) {
-                QRScannerDialog(bridge: bridge)
-            }
     }
 }
 
@@ -297,7 +294,7 @@ struct ControlToolbar: View {
             HStack(spacing: 4) {
                 TB(icon: "folder") { bridge.openFileDialog(); onTouch() }
                 TB(icon: "link") { bridge.showURLDialog = true; onTouch() }
-                TB(icon: "qrcode.viewfinder") { bridge.showQRScanner = true; onTouch() }
+                TB(icon: "qrcode.viewfinder") { bridge.showQRScannerWindow(); onTouch() }
                 TB(icon: "backward.fill") { bridge.playPrev(); onTouch() }
                 TB(icon: bridge.isPlaying ? "pause.fill" : "play.fill") { bridge.togglePlayPause(); onTouch() }
                 TB(icon: "forward.fill") { bridge.playNext(); onTouch() }

Sources/PlayerBridge.swift

@@ -52,6 +52,7 @@ final class PlayerBridge: ObservableObject {
     @Published var showURLDialog = false
     @Published var showTrackDialog = false
     @Published var showQRScanner = false
+    var qrScannerController: QRScannerWindowController?
     @Published var toastMessage: String?
     @Published var availableTracks: [String] = []
     @Published var currentTrackIndex: Int = 0
@@ -387,6 +388,16 @@ final class PlayerBridge: ObservableObject {
     
     func recordInteraction() { lastInteraction = Date() }
     
+    // MARK: - 扫码窗口
+    func showQRScannerWindow() {
+        #if os(macOS)
+        if qrScannerController == nil {
+            qrScannerController = QRScannerWindowController(bridge: self)
+        }
+        qrScannerController?.show()
+        #endif
+    }
+    
     func togglePlaylistWindow() {
         #if os(macOS)
         if let win = playlistWindow, win.isVisible {

Sources/QRScannerView.swift

@@ -4,26 +4,89 @@ import AVFoundation
 #if os(macOS)
 import AppKit
 
-// MARK: - 二维码扫描器视图
+// MARK: - 扫码窗口（独立 NSWindow，避免 SwiftUI sheet 布局崩溃）
-struct QRScannerView: NSViewRepresentable {
+class QRScannerWindowController: NSObject, AVCaptureMetadataOutputObjectsDelegate {
-    let onCodeDetected: (String) -> Void
+    var window: NSWindow?
+    var session: AVCaptureSession?
+    var previewLayer: AVCaptureVideoPreviewLayer?
+    var hostView: QRScannerHostView?
+    weak var bridge: PlayerBridge?
     
-    func makeCoordinator() -> Coordinator {
+    private var lastDetected: String?
-        Coordinator(onCodeDetected: onCodeDetected)
+    private var lastDetectedTime: Date = .distantPast
+    
+    init(bridge: PlayerBridge) {
+        self.bridge = bridge
+        super.init()
     }
     
-    func makeNSView(context: Context) -> NSView {
+    func show() {
-        let view = QRScannerHostView()
+        if let win = window, win.isVisible {
-        view.coordinator = context.coordinator
+            win.makeKeyAndOrderFront(nil)
-        context.coordinator.previewLayer = view.previewLayer
+            return
+        }
         
-        // 配置捕获会话
+        let win = NSWindow(
+            contentRect: NSRect(x: 0, y: 0, width: 400, height: 380),
+            styleMask: [.titled, .closable],
+            backing: .buffered,
+            defer: false
+        )
+        win.title = L.scanQRCode
+        win.isReleasedWhenClosed = false
+        win.center()
+        
+        // 创建宿主视图
+        let container = NSView(frame: win.contentRect(forFrameRect: win.frame).insetBy(dx: 0, dy: 0))
+        container.wantsLayer = true
+        container.layer?.backgroundColor = NSColor.black.cgColor
+        
+        let hostView = QRScannerHostView(frame: NSRect(x: 20, y: 80, width: 360, height: 240))
+        container.addSubview(hostView)
+        self.hostView = hostView
+        
+        // 提示文字
+        let label = NSTextField(labelWithString: L.scanHint)
+        label.font = NSFont.systemFont(ofSize: 11)
+        label.textColor = .secondaryLabelColor
+        label.frame = NSRect(x: 20, y: 20, width: 360, height: 40)
+        label.alignment = .center
+        label.lineBreakMode = .byWordWrapping
+        container.addSubview(label)
+        
+        // 检测结果文字
+        let resultLabel = NSTextField(labelWithString: "")
+        resultLabel.font = NSFont.monospacedSystemFont(ofSize: 12, weight: .regular)
+        resultLabel.textColor = .labelColor
+        resultLabel.frame = NSRect(x: 20, y: 330, width: 360, height: 30)
+        resultLabel.alignment = .center
+        resultLabel.lineBreakMode = .byTruncatingMiddle
+        resultLabel.tag = 100
+        container.addSubview(resultLabel)
+        
+        win.contentView = container
+        
+        // 配置摄像头
+        setupCapture(hostView: hostView)
+        
+        win.makeKeyAndOrderFront(nil)
+        NSApp.activate(ignoringOtherApps: true)
+        self.window = win
+    }
+    
+    func close() {
+        session?.stopRunning()
+        window?.close()
+    }
+    
+    private func setupCapture(hostView: QRScannerHostView) {
         let session = AVCaptureSession()
-        context.coordinator.session = session
+        self.session = session
         
         guard let device = AVCaptureDevice.default(for: .video),
               let input = try? AVCaptureDeviceInput(device: device) else {
-            return view
+            showError("No camera available")
+            return
         }
         
         if session.canAddInput(input) {
@@ -33,65 +96,74 @@ struct QRScannerView: NSViewRepresentable {
         let output = AVCaptureMetadataOutput()
         if session.canAddOutput(output) {
             session.addOutput(output)
-            output.setMetadataObjectsDelegate(context.coordinator, queue: .main)
+            output.setMetadataObjectsDelegate(self, queue: .main)
             output.metadataObjectTypes = [.qr]
         }
         
-        view.previewLayer.session = session
+        let previewLayer = AVCaptureVideoPreviewLayer(session: session)
-        view.previewLayer.videoGravity = .resizeAspectFill
+        previewLayer.videoGravity = .resizeAspectFill
+        hostView.previewLayer = previewLayer
+        self.previewLayer = previewLayer
         
-        // 后台启动会话
+        // 后台启动
-        DispatchQueue.global(qos: .userInitiated).async {
+        DispatchQueue.global(qos: .userInitiated).async { [weak self] in
             session.startRunning()
+            DispatchQueue.main.async {
+                self?.previewLayer?.frame = hostView.bounds
+            }
         }
-        
-        return view
     }
     
-    func updateNSView(_ nsView: NSView, context: Context) {}
+    private func showError(_ msg: String) {
+        guard let resultLabel = window?.contentView?.viewWithTag(100) as? NSTextField else { return }
+        resultLabel.stringValue = msg
+        resultLabel.textColor = .systemRed
+    }
     
-    // MARK: - Coordinator
+    // MARK: - AVCaptureMetadataOutputObjectsDelegate
-    class Coordinator: NSObject, AVCaptureMetadataOutputObjectsDelegate {
+    func metadataOutput(_ output: AVCaptureMetadataOutput, didOutput metadataObjects: [AVMetadataObject], from connection: AVCaptureConnection) {
-        let onCodeDetected: (String) -> Void
+        guard let metadata = metadataObjects.first as? AVMetadataMachineReadableCodeObject,
-        var session: AVCaptureSession?
+              let code = metadata.stringValue else { return }
-        weak var previewLayer: AVCaptureVideoPreviewLayer?
-        private var lastDetected: String?
-        private var lastDetectedTime: Date = .distantPast
         
-        init(onCodeDetected: @escaping (String) -> Void) {
+        // 防抖 3 秒
-            self.onCodeDetected = onCodeDetected
+        let now = Date()
+        if code == lastDetected, now.timeIntervalSince(lastDetectedTime) < 3 {
+            return
+        }
+        lastDetected = code
+        lastDetectedTime = now
+        
+        // 显示检测结果
+        if let resultLabel = window?.contentView?.viewWithTag(100) as? NSTextField {
+            resultLabel.stringValue = code
+            resultLabel.textColor = .systemGreen
         }
         
-        func metadataOutput(_ output: AVCaptureMetadataOutput, didOutput metadataObjects: [AVMetadataObject], from connection: AVCaptureConnection) {
+        // 检查是否为有效 URL
-            guard let metadata = metadataObjects.first as? AVMetadataMachineReadableCodeObject,
+        if let url = URL(string: code), (url.scheme == "http" || url.scheme == "https") {
-                  let code = metadata.stringValue else { return }
+            DispatchQueue.main.async { [weak self] in
-            
+                self?.bridge?.addURL(code)
-            // 防抖：同一码 3 秒内不重复触发
-            let now = Date()
-            if code == lastDetected, now.timeIntervalSince(lastDetectedTime) < 3 {
-                return
             }
-            lastDetected = code
-            lastDetectedTime = now
             
-            onCodeDetected(code)
+            // 延迟关闭
-        }
+            DispatchQueue.main.asyncAfter(deadline: .now() + 1.5) { [weak self] in
-        
+                self?.close()
-        deinit {
+            }
-            session?.stopRunning()
         }
     }
+    
+    deinit {
+        session?.stopRunning()
+    }
 }
 
 // MARK: - 宿主视图
 class QRScannerHostView: NSView {
-    let previewLayer = AVCaptureVideoPreviewLayer()
+    var previewLayer: AVCaptureVideoPreviewLayer?
-    weak var coordinator: QRScannerView.Coordinator?
     
     override init(frame: CGRect) {
         super.init(frame: frame)
         wantsLayer = true
-        // 不在 init 时设置 layer = previewLayer，等 layout 时再添加为 sublayer
     }
     
     required init?(coder: NSCoder) {
@@ -100,74 +172,7 @@ class QRScannerHostView: NSView {
     
     override func layout() {
         super.layout()
-        if previewLayer.superlayer == nil {
+        previewLayer?.frame = bounds
-            layer?.addSublayer(previewLayer)
-        }
-        previewLayer.frame = bounds
-    }
-}
-
-// MARK: - 扫码弹窗
-struct QRScannerDialog: View {
-    @ObservedObject var bridge: PlayerBridge
-    @Environment(\.dismiss) private var dismiss
-    @State private var detectedCode: String?
-    @State private var isProcessing = false
-    
-    var body: some View {
-        VStack(spacing: 16) {
-            Text(L.scanQRCode)
-                .font(.headline)
-            
-            Text(L.scanHint)
-                .font(.caption)
-                .foregroundColor(.secondary)
-            
-            QRScannerView { code in
-                detectedCode = code
-                handleCode(code)
-            }
-            .frame(width: 320, height: 240)
-            .cornerRadius(8)
-            
-            if let code = detectedCode {
-                VStack(spacing: 8) {
-                    Text(L.detectedCode)
-                        .font(.caption)
-                        .foregroundColor(.secondary)
-                    Text(code)
-                        .font(.system(.body, design: .monospaced))
-                        .lineLimit(2)
-                        .multilineTextAlignment(.center)
-                }
-                .padding(12)
-                .background(Color.secondary.opacity(0.1))
-                .cornerRadius(8)
-            }
-            
-            HStack {
-                Button(L.close) { dismiss() }
-                    .keyboardShortcut(.cancelAction)
-                Spacer()
-            }
-        }
-        .padding(20)
-        .frame(width: 380)
-    }
-    
-    private func handleCode(_ code: String) {
-        guard !isProcessing else { return }
-        
-        // 检查是否为有效 URL
-        if let url = URL(string: code), url.scheme == "http" || url.scheme == "https" {
-            isProcessing = true
-            bridge.addURL(code)
-            
-            // 延迟关闭弹窗
-            DispatchQueue.main.asyncAfter(deadline: .now() + 1.5) {
-                dismiss()
-            }
-        }
     }
 }