相机预览不会填满屏幕

Question

这就是我在iPad3中以横向模式设置相机预览的方法

- (void)viewDidAppear:(BOOL)animated

{

AVCaptureSession *session = [[AVCaptureSession alloc] init];
session.sessionPreset = AVCaptureSessionPreset640x480;

CALayer *viewLayer = self.vImagePreview.layer;

NSLog(@"viewLayer = %@", viewLayer);

AVCaptureVideoPreviewLayer *captureVideoPreviewLayer = [[AVCaptureVideoPreviewLayer alloc] initWithSession:session];

captureVideoPreviewLayer.frame = self.vImagePreview.bounds;
[self.vImagePreview.layer addSublayer:captureVideoPreviewLayer];

AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];

NSError *error = nil;
AVCaptureDeviceInput *input = [AVCaptureDeviceInput deviceInputWithDevice:device error:&error];
if (!input) {
    // Handle the error appropriately.
    NSLog(@"ERROR: trying to open camera: %@", error);
}
[session addInput:input];

stillImageOutput = [[AVCaptureStillImageOutput alloc] init];
NSDictionary *outputSettings = [[NSDictionary alloc] initWithObjectsAndKeys: AVVideoCodecJPEG, AVVideoCodecKey, nil];
[stillImageOutput setOutputSettings:outputSettings];

[session addOutput:stillImageOutput];

[session startRunning];

}

在故事板中，我将视图设置为填满整个屏幕，但最终看起来像这样：

此外，图像也旋转90度。如何更改此设置，以便我可以将相机预览填充整个屏幕？

感谢。

Answer 1

旋转你的图层​​：

    switch (self.interfaceOrientation)
    {
     case UIInterfaceOrientationLandscapeRight:
       [captureVideoPreviewLayer setAffineTransform:CGAffineTransformMakeRotation(-M_PI / 2)];
       break;
     case UIInterfaceOrientationLandscapeLeft:
       [captureVideoPreviewLayer setAffineTransform:CGAffineTransformMakeRotation(M_PI / 2)];
       break;
    }

[self.vImagePreview.layer addSublayer:captureVideoPreviewLayer];