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POHow to crop a UIImageView to a new UIImage in 'aspect fit' mode?
 

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  1. POHow to crop a UIImageView to a new UIImage in 'aspect fit' mode?
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    <p><img src="https://i.stack.imgur.com/6X1L1.png" alt="enter image description here"></p> <p>I would like to create a new UIImage by cropping the image inside a UIImageView. For example in the above pic, I want a new UIImage of the area outlined in green. I found code to do this, normally it looks something like this (as a UIImage category):</p> <pre><code>- (UIImage *)croppedImage:(CGRect)bounds { CGImageRef imageRef = CGImageCreateWithImageInRect([self CGImage], bounds); UIImage *croppedImage = [UIImage imageWithCGImage:imageRef]; CGImageRelease(imageRef); return croppedImage; } </code></pre> <p>Makes perfect sense. HOWEVER, my UIImageView is in contentMode 'aspect fit'. Seems like that complicates the CGRect calculations for CGImageCreateWithImageInRect and I haven't been able to figure out the right solution. </p> <p>I figure I need to apply the same transformations to the green rect as were done to the image? </p> <p>ALSO: I found this other question here (<a href="https://stackoverflow.com/questions/6278876/how-to-know-the-image-size-after-applying-aspect-fit-for-the-image-in-an-uiimage">How to know the image size after applying aspect fit for the image in an UIImageView</a>), which seems to show a brute force way of getting the size, but I am still not sure how that fits into a cropping situation.</p> <p>Any ideas?</p> <p><strong>EDIT</strong>: In my case, I literally have a square as shown above drawn in an overlay view over the UIImageView. So while I realize I am cropping the UIImage (inside the UIImageView), I need to somehow change the green CGRect such that it 'matches' the transformation done when 'aspect fit' is applied. For example, if I leave my UIImageView in 'top left' mode, then everything works fine, because there is a 1:1 mapping between the underlying UIImage and the UIImageView. The problem in 'top left' mode is that the entire image doesn't always display, because it might be bigger than my UIImageView.</p>
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