相机预览不会填充屏幕

Question

这是我如何在我的iPad3设立在风景模式下，相机预览

- (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，我设置视图来填充整个屏幕，但它看起来像这样：

此外，图像也旋转90º度。我怎样才能改变这个，所以我可以让相机预览填满整个屏幕？

谢谢。

Answer 1

旋转你的层：

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];