ios - AVCaptureSession 无法在对 beginConfiguration/commitConfiguration 的调用之间开始运行

Question

我正在尝试使用 Zxing 读取QR 码:

self.capture = [[ZXCapture alloc] init];
self.capture.rotation = 90.0f;

// Use the back camera
self.capture.delegate = self;
self.capture.camera = self.capture.back;

self.capture.layer.frame = self.view.bounds;
[self.view.layer addSublayer:self.capture.layer];

我收到这个错误:

* 由于未捕获的异常“NSGenericException”而终止应用程序，原因:“* AVCaptureSession 无法在对 beginConfiguration/commitConfiguration 的调用之间开始运行”

Answer 1

如果可以的话，它可以工作

self.capture = [[ZXCapture alloc] init];
self.capture.rotation = 90.0f;

// Use the back camera

self.capture.camera = self.capture.back;

self.capture.layer.frame = self.view.bounds;
[self.view.layer addSublayer:self.capture.layer];

self.capture.delegate = self; // this must be last.