Is there a way to crop images in a non-rectangular shape on iOS? What I need is for a person to be able to draw a circle (or what ever closing shape) with their finger inside an image and select "Crop". This will make the content inside the shape stay, and the outside be "removed". Not black, but a transparent save. If I then have two UIImageView's ontop of eachother in one view, and place the customly cropped image on the top, I need the image in back to be visible outside the shape.
Yes, you would use a CGImageMask.