如何更改AVCaptureVideoPreviewLayer幀的高度和寬度

Question

請幫我如何更改AVCaptureVideoPreviewLayer幀大小和

我通過Height =100px ; and width = 300px Height =100px ; and width = 300px 。

如果我通過高度大小100比寬度不改變為300px

這是代碼：

    AVCaptureVideoPreviewLayer *previewLayer = [AVCaptureVideoPreviewLayer layerWithSession:session];
    previewLayer.frame = CGRectMake(20, 50, 300, 100);
    self.view.frame=CGRectMake(20, 50, 300, 100);


    CGRect layerRect = [[[self view] layer] bounds];
    [previewLayer setBounds:layerRect];
    [previewLayer setPosition:CGPointMake(CGRectGetMidX(layerRect),CGRectGetMidY(layerRect))];
    [[[self view] layer] addSublayer:previewLayer];
    [previewView.layer addSublayer:previewLayer];

Answer 1

@property (nonatomic, retain) AVCaptureVideoPreviewLayer *prevLayer;

然后：

self.prevLayer = [AVCaptureVideoPreviewLayer layerWithSession: self.captureSession];
    self.prevLayer.frame = yourRect;
[self.view.layer addSublayer: self.prevLayer];

而已。