Pinch and Zoom UIImage

Question

I would like to edit an UIImage like contacts -> edit profile -> edit image does. I am getting the images originally from the UIImagePickerController and then saving locally. Is this possible using the UIImagePickerController or do I need to go another route?

Answer 1

You can zoom imageview like,

self.scrollView.minimumZoomScale = 0.2;
self.scrollView.maximumZoomScale = 5.0;
self.scrollView.delegate = self;

and you need to implement scrollview delegate like,

 -(UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView
{
    return self.imgView;
}

You should have scrollview contains imageview in your interface builder or say your view controller.

You need to confirm UIScrollViewDelegate !

then you can zoom in or zoom out in your image view!

Swift :

    self.scrollView.minimumZoomScale = 0.2
    self.scrollView.maximumZoomScale = 5.0
    self.scrollView.delegate = self

and

  func viewForZooming(in scrollView: UIScrollView) -> UIView? {

    return self.imgView
   }

Answer 2

You can use this library which saves lot of time.

https://github.com/ruslanskorb/RSKImageCropper