[SOLVED] How to Apply a Scale transform to an AVCaptureVideoPreviewLayer

How to Apply a Scale transform to an AVCaptureVideoPreviewLayer

I have an AVCaptureVideoPreviewLayer named previewlayer that is set to a UIImageView named VideoOut that was implemented using Storyboard

The code I used to connect them was as follows

    previewlayer.frame = VideoOut.bounds

I then wanted to add a "zoom in" button that would scale VideoOut by a factor of 0.25 each time the "Zoom In" button was pressed. The method I tried to use is shown below

    @IBAction func Zooma(_ sender: Any) {
    UIView.animate(withDuration: 0.0, delay: 0.0, options: [], animations: {
        self.VideoOut.transform = CGAffineTransform(scaleX: 1.25, y: 1.25)
    }, completion: nil)

Though this does nothing in terms of scaling the ImageView with the video feed. Although when I use the same code on an Imageview not connected to the AVCaptureVideoPreviewLayer the line of code works as intended.

Any advice or insight would be much appreciated

Solution

If you want a smooth video zoom, try a zoom ramp on the AVCaptureDevice object that the capture layer originates from: ramp(toVideoZoomFactor: 1.25, withRate: 0.25)