IOS头像圆环效果

- (void)drawRect:(CGRect)rect {
    // 1.加载图片
    UIImage *image = [UIImage imageNamed:@"456"];
    // 2.开启图形上下文
    CGSize size = CGSizeMake(image.size.width + 20 , image.size.height + 20);
    
    UIGraphicsBeginImageContextWithOptions(size, NO, 0);
    
    // 绘制大圆 圆环效果
    UIBezierPath *path = [UIBezierPath bezierPathWithOvalInRect:CGRectMake(0, 0, size.width, size.height)];
    [[UIColor grayColor] set];
    [path fill];
    
    // 裁剪区域
    UIBezierPath *clipPath = [UIBezierPath bezierPathWithOvalInRect:CGRectMake(10, 10, image.size.width, image.size.height)];
    [clipPath addClip];
    
    // 3.把图片绘制到上下文当中
    [image drawAtPoint:CGPointMake(10, 10)];
    // 4.从图形上下文中取出图片
    UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
    // 5.关闭上下文
    UIGraphicsEndPDFContext();

    self.imageView.image = newImage;
}

效果图

Simulator Screen Shot 2016年10月14日 上午9.09.42.png