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iosswiftlayoutsublayout

Sublayer resizing to UIView bounds in Swift

I'm trying to put an AVCaptureVideoPreviewLayer as a sublayer in a UIView element. I tried to set its frame to the UIView bounds by using:

cameraPreviewLayer = AVCaptureVideoPreviewLayer(session: captureSession)
cameraPreviewLayer?.videoGravity = AVLayerVideoGravity.resizeAspectFill
cameraPreviewLayer?.connection?.videoOrientation = AVCaptureVideoOrientation.portrait
cameraPreviewLayer?.frame = PreviewController.bounds
PreviewController.layer.addSublayer(cameraPreviewLayer!)

When I tried to print the values of the frame and the bounds it gives me this:

print(PreviewController.bounds)
print(cameraPreviewLayer!.frame)

(0.0, 0.0, 375.0, 500.0)
(0.0, 0.0, 375.0, 500.0)

In the actual application, it results in the sublayer not filling up the whole UIView element:

Error

Does anyone know how to resolve this?

Solution

  • You need to

    override func viewDidLayoutSubviews() {
  super.viewDidLayoutSubviews()
  cameraPreviewLayer?.frame = PreviewController.bounds
}