Rotate and Crop UIImage

Question

Imagine I have an UIImage. I need to rotate and then crop it in the global coordinate system (not UIImage coordinate system). So the resulted image will be cropped and rotated.

How can I do this? CGImageCreateWithImageInRect will crop image only in the image-relative coordinates.

PS Answer in comments. You should use CIImage.

Answer 1

Maybe this can help

//init
CIImage *image = [CIImage imageWithCGImage:CGImageRef];
//rotation
CIImage *rotatedImage = [image imageByApplyingTransform:someTransform];
//crop
CIImage *croppedImage = [rotatedImage imageByCroppingToRect:someRect];