切片在IOS

Question

图像目前我正在寻找切片的图像的方法（一个来自照片库抓起，例如）成多个不同的长方形片的。任何人都可以指出我正确的方向吗？

Answer 1

CGImageRef topLeftImageRef = CGImageCreateWithImageInRect(originalImage.CGImage, CGRectMake(0,0,originalImage.size.width/2,originalImage.size.height/2)); 

UIImage *topLeftImage = [UIImage imageWithCGImage:topLeftImageRef];