AVcaptureMetadataOutput 在 ios10 中不起作用
AVcaptureMetadataOutput does not work in ios10
我将 AVCaptureMetadataOutputObjectsDelegate
用于条码扫描仪,效果非常好。但是因为 iOS 10 它不再工作了。当我用它的按钮打开 barcodescanner
时,我总是收到 EXC_BAD_ACCESS 错误。当我向会话添加输出时发生错误。
有人可以帮帮我吗?我真的什么都试过了,这让我发疯。
这是我目前正在使用的线路。
func captureOutput(_ captureOutput: AVCaptureOutput!, didOutputMetadataObjects metadataObjects: [Any]!, from connection: AVCaptureConnection!) {
// Get the first object from the metadataObjects array.
if let barcodeData = metadataObjects.first {
// Turn it into machine readable code
let barcodeReadable = barcodeData as? AVMetadataMachineReadableCodeObject;
if let readableCode = barcodeReadable {
// Send the barcode as a string to barcodeDetected()
barcodeDetected(readableCode.stringValue);
}
// Vibrate the device to give the user some feedback.
AudioServicesPlaySystemSound(SystemSoundID(kSystemSoundID_Vibrate))
// Avoid a very buzzy device.
session.stopRunning()
}
}
这是我的 Objective-C,它在 iOS 10 下运行良好。IIRC 我想如果变量只是方法的本地变量,我会遇到麻烦。确保您所有的变量都是属性。
- (void)initialiseVideoSession {
_session = [[AVCaptureSession alloc] init];
_device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
NSError *error = nil;
_input = [AVCaptureDeviceInput deviceInputWithDevice:_device error:&error];
if (_input) {
[_session addInput:_input];
_output = [[AVCaptureMetadataOutput alloc] init];
[_output setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()];
[_session addOutput:_output];
_output.metadataObjectTypes = [_output availableMetadataObjectTypes];
_prevLayer = [AVCaptureVideoPreviewLayer layerWithSession:_session];
_prevLayer.frame = self.view.bounds;
_prevLayer.videoGravity = AVLayerVideoGravityResizeAspectFill;
[self.view.layer addSublayer:_prevLayer];
[_session startRunning];
} else {
// Error
}
}
我将 AVCaptureMetadataOutputObjectsDelegate
用于条码扫描仪,效果非常好。但是因为 iOS 10 它不再工作了。当我用它的按钮打开 barcodescanner
时,我总是收到 EXC_BAD_ACCESS 错误。当我向会话添加输出时发生错误。
有人可以帮帮我吗?我真的什么都试过了,这让我发疯。
这是我目前正在使用的线路。
func captureOutput(_ captureOutput: AVCaptureOutput!, didOutputMetadataObjects metadataObjects: [Any]!, from connection: AVCaptureConnection!) {
// Get the first object from the metadataObjects array.
if let barcodeData = metadataObjects.first {
// Turn it into machine readable code
let barcodeReadable = barcodeData as? AVMetadataMachineReadableCodeObject;
if let readableCode = barcodeReadable {
// Send the barcode as a string to barcodeDetected()
barcodeDetected(readableCode.stringValue);
}
// Vibrate the device to give the user some feedback.
AudioServicesPlaySystemSound(SystemSoundID(kSystemSoundID_Vibrate))
// Avoid a very buzzy device.
session.stopRunning()
}
}
这是我的 Objective-C,它在 iOS 10 下运行良好。IIRC 我想如果变量只是方法的本地变量,我会遇到麻烦。确保您所有的变量都是属性。
- (void)initialiseVideoSession {
_session = [[AVCaptureSession alloc] init];
_device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
NSError *error = nil;
_input = [AVCaptureDeviceInput deviceInputWithDevice:_device error:&error];
if (_input) {
[_session addInput:_input];
_output = [[AVCaptureMetadataOutput alloc] init];
[_output setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()];
[_session addOutput:_output];
_output.metadataObjectTypes = [_output availableMetadataObjectTypes];
_prevLayer = [AVCaptureVideoPreviewLayer layerWithSession:_session];
_prevLayer.frame = self.view.bounds;
_prevLayer.videoGravity = AVLayerVideoGravityResizeAspectFill;
[self.view.layer addSublayer:_prevLayer];
[_session startRunning];
} else {
// Error
}
}