UIImage *image = [UIImage imageNamed:@”KO.png”];
CGImageRef imageRef =image.CGImage;
CGImageRef image = CGImageCreateWithImageInRect （imageRef，rect）；
//rect为imageView的frame
UIImage*newImage = [[UIImage alloc] initWithCGImage:image]；
切割图片
CGImageRef imageRef =image.CGImage;
CGImageRef image = CGImageCreateWithImageInRect （imageRef，rect）；
//rect为imageView的frame
UIImage*newImage = [[UIImage alloc] initWithCGImage:image]；
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