切片在IOS

Question

圖像目前我正在尋找切片的圖像的方法（一個來自照片庫抓起，例如）成多個不同的長方形片的。任何人都可以指出我正確的方向嗎？

Answer 1

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

UIImage *topLeftImage = [UIImage imageWithCGImage:topLeftImageRef];