请教： 如何在图片的指定位置上截图（给出坐标，以及长和宽）

看看这个是不是你想要的：-(UIImage *)getImageFromImage{//大图bigImage//定义myImageRect，截图的区域CGRect myImageRect = CGRectMake(10.0, 10.0, 57.0, 57.0);UIImage* bigImage= [UIImage imageNamed:@"k00030.jpg"];CGImageRef imageRef = bigImage.CGImage;CGImageRef subImageRef = CGImageCreateWithImageInRect(imageRef, myImageRect);CGSize size;size.width = 57.0;size.height = 57.0;UIGraphicsBeginImageContext(size);CGContextRef context = UIGraphicsGetCurrentContext();CGContextDrawImage(context, myImageRect, subImageRef);UIImage* smallImage = [UIImage imageWithCGImage:subImageRef];UIGraphicsEndImageContext();return smallImage;}

截图之后，可以在visio中加坐标