AVcaptureMetadataOutput在ios10中不起作用

Question

我使用AVCaptureMetadataOutputObjectsDelegate作为条形码扫描器，它的工作非常完美。但是从iOS 10开始，它不再工作。当我用它的按钮打开barcodescanner时，我总是得到一个EXC_BAD_ACCESS错误。将输出添加到会话时发生错误。

有人可以帮我吗？我真的尝试了一切，这让我疯狂。

Answer 1

这里是我的Objective-C，这是在iOS的10 IIRC工作正常，我想我有麻烦，如果瓦尔只是局部性的方法。确保你的所有变量都是属性。

- (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 
    } 
} 

Answer 2

这是我现在的作品。

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() 
    } 
}