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Set metadata types after session starts (availableMetadataObjectTypes empty before)

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yumoqing 2026-06-24 19:28:38 +08:00
parent e87921b59f
commit b929b1eb6e
1 changed files with 18 additions and 17 deletions
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35
Sources/QRScannerView.swift
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@ -155,22 +155,6 @@ class QRScannerWindowController: NSObject, AVCaptureMetadataOutputObjectsDelegat
if session.canAddOutput(output) { if session.canAddOutput(output) {
session.addOutput(output) session.addOutput(output)
output.setMetadataObjectsDelegate(self, queue: .main) output.setMetadataObjectsDelegate(self, queue: .main)
// 检查摄像头是否支持 QR 码识别
if output.availableMetadataObjectTypes.contains(.qr) {
output.metadataObjectTypes = [.qr]
output.rectOfInterest = CGRect(x: 0.1, y: 0.1, width: 0.8, height: 0.8)
} else {
// fallback: 支持什么就用什么
let types = output.availableMetadataObjectTypes.filter { $0 == .qr || $0 == .ean13 || $0 == .ean8 || $0 == .code128 }
if !types.isEmpty {
output.metadataObjectTypes = types
} else {
DispatchQueue.main.async { [weak self] in
self?.showError("Camera does not support QR code scanning")
}
return
}
}
} }
let previewLayer = AVCaptureVideoPreviewLayer(session: session) let previewLayer = AVCaptureVideoPreviewLayer(session: session)
@ -181,7 +165,6 @@ class QRScannerWindowController: NSObject, AVCaptureMetadataOutputObjectsDelegat
// 回到主线程更新 UI // 回到主线程更新 UI
DispatchQueue.main.async { [weak self] in DispatchQueue.main.async { [weak self] in
guard let self = self, previewHost.window != nil else { guard let self = self, previewHost.window != nil else {
// 窗口已关闭，停止
session.stopRunning() session.stopRunning()
return return
} }
@ -196,6 +179,24 @@ class QRScannerWindowController: NSObject, AVCaptureMetadataOutputObjectsDelegat
// 启动会话（后台启动避免阻塞） // 启动会话（后台启动避免阻塞）
DispatchQueue.global(qos: .userInitiated).async { DispatchQueue.global(qos: .userInitiated).async {
session.startRunning() session.startRunning()
// session 启动后再设置 metadata types（启动前 availableMetadataObjectTypes 可能为空）
if session.canAddOutput(output) == false,
output.availableMetadataObjectTypes.contains(.qr) {
output.metadataObjectTypes = [.qr]
} else {
// 尝试设置所有支持的类型
let available = output.availableMetadataObjectTypes
if available.contains(.qr) {
output.metadataObjectTypes = [.qr]
} else if !available.isEmpty {
output.metadataObjectTypes = available
} else {
DispatchQueue.main.async { [weak self] in
self?.showError("Camera does not support QR scanning. Check System Settings → Privacy → Camera.")
}
}
}
} }
} }
} }