Question

My application have an function that allow user to move and scale the image just like setting allowsEditing = YES with UIImagePickerController.

My approach is having a scrollview which allow user to zoom with level 1-4
There is only a image view on the scrollview.

At the end, I want to crop the image as the screen size. How can I do it?

Answer 1

The trick is to capture the layer of the view containing the scaled / rotated image. In this case you need to capture the scrollview layer NOT the image itself.

I have a UIImage capture category for this…check out my article and download the source code.

UPDATE: to crop part of the image as per the comment below…

First capture the whole view then crop the image to the specified rect using the following method in the UIImage+Resize category (also in the article…)

- (UIImage *)croppedImage:(CGRect)bounds;