新建一個(gè)image的分類

#import "UIImage+CircleImage.h"

@implementation UIImage (CircleImage)


- (UIImage *)circleImage{
    // no 代表透明
    UIGraphicsBeginImageContextWithOptions(self.size, NO, 0.0);

    // 獲得上下文
    CGContextRef ctx = UIGraphicsGetCurrentContext();
    
    // 添加一個(gè)圓
    CGRect rect = CGRectMake(0, 0, self.size.width, self.size.height);
    CGContextAddEllipseInRect(ctx, rect);
    
    // 裁剪
    CGContextClip(ctx);
    
    // 將圖片畫上去
    [self drawInRect:rect];
    
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();

    UIGraphicsEndImageContext();
    
    return image;
}

調(diào)用

[self.profileImage sd_setImageWithURL:[NSURL URLWithString:model.profile_image] placeholderImage:[UIImage imageNamed:@"defaultUserIcon"]   completed:^(UIImage * _Nullable image, NSError * _Nullable error, SDImageCacheType cacheType, NSURL * _Nullable imageURL) {
        self.profileImage.image = [image circleImage];
    }];