如何更改AVCaptureVideoPreviewLayer帧的高度和宽度

Question

请帮我看看如何更改AVCaptureVideoPreviewLayer帧大小和

我正在通过Height =100px ; and width = 300px。
如果我通过身高100而不是宽度不变为300px

这是代码：

    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];

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