iOS圆形图片裁剪，原型图片外面加一个圆环

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/**

 *  在圆形外面加一个圆环

 */

- (void)yuanHuan{

    //0.加载图片

    UIImage *image = [UIImage imageNamed:@"AppIcon1024"];

    //图片的宽度

    CGFloat imageWH = image.size.width;

    //设置圆环的宽度

    CGFloat border = 1;

    //大圆形的宽度高度

    CGFloat ovalWH = imageWH + 2 * border;

    //1、开启位图上下文

    UIGraphicsBeginImageContextWithOptions(CGSizeMake(ovalWH, ovalWH), NO, 0);

    //2、画大圆

    UIBezierPath *path = [UIBezierPath bezierPathWithOvalInRect:CGRectMake(0, 0, ovalWH, ovalWH)];

    [[UIColor redColor] set];

    [path fill];

    //3、设置裁剪区（小圆）

    UIBezierPath *clipPath = [UIBezierPath bezierPathWithOvalInRect:CGRectMake(border, border, imageWH, imageWH)];

    [clipPath addClip];

    //4、绘制图片

    [image drawAtPoint:CGPointMake(border, border)];

    //5、获取图片

    UIImage *clipImage = UIGraphicsGetImageFromCurrentImageContext();

    //6、关闭上下文

    UIGraphicsEndImageContext();

    self.imageView.image = clipImage;

}

/**

 *  裁剪一个原型图片

 */

- (void)yuan{

    //获取图片

    UIImage *image = [UIImage imageNamed:@"AppIcon1024"];

    //1.开启位图上下文，跟图片尺寸大小一样

    //NO:不透明  0：scale不缩放

    UIGraphicsBeginImageContextWithOptions(image.size, NO, 0);

    //2.设置图形裁剪区域，正切图片

    //2.1创建一个圆形路径

    UIBezierPath *path = [UIBezierPath bezierPathWithOvalInRect:CGRectMake(0, 0, image.size.width, image.size.width)];

    //2.2把路径设置裁剪区

    [path addClip];

    //3.绘制图片

    [image drawAtPoint:CGPointMake(0, 0)];

    //4.从上下文中获取图片

    UIImage *clipImage = UIGraphicsGetImageFromCurrentImageContext();

    //5.关闭上下文

    UIGraphicsEndImageContext();

    _imageView.image = clipImage;

}

iOS圆形图片裁剪，原型图片外面加一个圆环

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原文地址：http://www.cnblogs.com/soulDn/p/5626314.html