AVCaptureDevice Camera Zoom

Question

I have a simple AVCaptureSession running to get a camera feed in my app and take photos. How can I implement the \'pinch to zoom\' functionality using a UIGestureRecognize

Answer 1

I am using iOS SDK 8.3 and the AVfoundation framework and for me using the following method worked for :

nameOfAVCaptureVideoPreviewLayer.affineTransform = CGAffineTransformMakeScale(scaleX, scaleY) 

For saving the picture with the same scale I used the following method:

nameOfAVCaptureConnection.videoScaleAndCropFactor = factorNumber; 

The code bellow is for getting the image in the scale

[stillImageOutput captureStillImageAsynchronouslyFromConnection:videoConnnection completionHandler:^(CMSampleBufferRef imageDataSampleBuffer, NSError *error) {
        if(imageDataSampleBuffer != NULL){

            NSData *imageData = [AVCaptureStillImageOutput  jpegStillImageNSDataRepresentation:imageDataSampleBuffer];
            UIImage *image = [UIImage imageWithData:imageData];
}
}];