我正在尝试在视图中显示实时摄像头视频，但是当我运行以下代码时，它并没有填满整个屏幕。它仅填充 3.5 英寸屏幕尺寸（在 5.5 英寸屏幕上运行）。我已将autolayout每一侧的视图设置为 0。
session = [[AVCaptureSession alloc] init];
[session setSessionPreset:AVCaptureSessionPresetPhoto];
AVCaptureDevice *inputDevice = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
NSError *error;
AVCaptureDeviceInput *deviceInput = [AVCaptureDeviceInput deviceInputWithDevice:inputDevice error:&error];
if ([session canAddInput:deviceInput]) {
[session addInput:deviceInput];
}
AVCaptureVideoPreviewLayer *previewLayer = [[AVCaptureVideoPreviewLayer alloc] initWithSession:session];
[previewLayer setVideoGravity:AVLayerVideoGravityResizeAspectFill];
CALayer *rootLayer = [[self view] layer];
[rootLayer setMasksToBounds:YES];
CGRect frame = frameForCapture.frame;
[previewLayer setFrame:frame];
[rootLayer insertSublayer:previewLayer atIndex:0];
stillImage = [[AVCaptureStillImageOutput alloc] init];
NSDictionary *outputSettings = [[NSDictionary alloc] initWithObjectsAndKeys:AVVideoCodecJPEG, AVVideoCodecKey, nil];
[stillImage setOutputSettings:outputSettings];
[session addOutput:stillImage];
[session startRunning];
当我将视图控制器的尺寸从 3.5 英寸设置为 5.5 英寸并运行时，它会填满屏幕。当autolayout大小发生变化时它正在工作，但在它运行时不起作用。