加载数据 设置图片圆角方法

[_iconView sd_setImageWithURL:[NSURL URLWithString:item.image_list] placeholderImage:[UIImage imageNamed:@"defaultUserIcon"] options:SDWebImageCacheMemoryOnly completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType, NSURL *imageURL) {

// 1.开启图形上下文

// 比例因素:当前点与像素比例

UIGraphicsBeginImageContextWithOptions(image.size, NO, 0);

// 2.描述裁剪区域

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

// 3.设置裁剪区域;

[path addClip];

// 4.画图片

[image drawAtPoint:CGPointZero];

// 5.取出图片

image = UIGraphicsGetImageFromCurrentImageContext();

// 6.关闭上下文

UIGraphicsEndImageContext();

_iconView.image = image;

}];