ios 裁剪图片（1裁多）

裁剪图片：（C类库方法）

- (void)viewDidLoad {
    [super viewDidLoad];
    UIImageView *iv = [[UIImageView alloc]initWithFrame:CGRectMake(100, 100, 60, 90)];
    [self.view addSubview:iv];
    
    //得到僵尸的完整图片
    UIImage *zombImage = [UIImage imageNamed:@"zomb_2"];

//    ************截取单张图片
//    截取里面的图片 CG开头
    CGImageRef subImage = CGImageCreateWithImageInRect(zombImage.CGImage, CGRectMake(0, 0, zombImage.size.width/8, zombImage.size.height));

//    把CGImage转成 UIImage
    iv.image = [UIImage imageWithCGImage:subImage];


    //释放用完的CG图片
       CGImageRelease(subImage);

//   *******************截取每一张
    NSMutableArray *images = [NSMutableArray array];

//    0w 1w  2w  3w
    for (int i=0; i<8; i++) {
        CGImageRef imageRef = CGImageCreateWithImageInRect(zombImage.CGImage, CGRectMake(i*(zombImage.size.width/8), 0, zombImage.size.width/8, zombImage.size.height));
        [images addObject:[UIImage imageWithCGImage:imageRef]];

        //把用完的imageRef释放（CG...框架没有自动释放池，需要手动释放）
        CGImageRelease(imageRef);
    }
    //设置动画的代码
    [iv setAnimationImages:images];
    [iv setAnimationDuration:1];
    [iv setAnimationRepeatCount:0];
    [iv startAnimating];
    
}