#import <UIKit/UIKit.h>

typedef void(^DownloadImageSuccessBlock)(UIImage *image);

typedef void(^DownloadImageFailedBlock)(NSError *error);

typedef void(^DownloadImageProgressBlock)(CGFloat progress);

@interface UIImageView (SDWebImage)

/**

 异步加载图片

 @param url 图片地址

 @param imageName 占位图片名

 */

- (void)downloadImage:(NSString *)url placeholder:(NSString *)imageName;

/**

 异步加载图片，可以监听下载进度，成功或失败

 @param url 图片地址

 @param imageName 占位图片名

 @param success 下载成功

 @param failed 下载失败

 @param progress 下载进度

 */

- (void)downloadImage:(NSString *)url

          placeholder:(NSString *)imageName

              success:(DownloadImageSuccessBlock)success

               failed:(DownloadImageFailedBlock)failed

             progress:(DownloadImageProgressBlock)progress;

@end

#import "UIImageView+SDWebImage.h"

#import "UIImageView+WebCache.h"

@implementation UIImageView (SDWebImage)

- (void)downloadImage:(NSString *)url placeholder:(NSString *)imageName {

    [self sd_setImageWithURL:[NSURL URLWithString:url] placeholderImage:[UIImage imageNamed:imageName] options:SDWebImageRetryFailed | SDWebImageLowPriority];

}

- (void)downloadImage:(NSString *)url placeholder:(NSString *)imageName success:(DownloadImageSuccessBlock)success failed:(DownloadImageFailedBlock)failed progress:(DownloadImageProgressBlock)progress {

    [self sd_setImageWithURL:[NSURL URLWithString:url] placeholderImage:[UIImage imageNamed:imageName] options:SDWebImageRetryFailed | SDWebImageLowPriority progress:^(NSInteger receivedSize, NSInteger expectedSize, NSURL * _Nullable targetURL) {

        progress(receivedSize * 1.0 / expectedSize);

    } completed:^(UIImage * _Nullable image, NSError * _Nullable error, SDImageCacheType cacheType, NSURL * _Nullable imageURL) {

        if (error) {

            failed(error);

        } else {

            self.image = image;

            success(image);

        }

    }];

}

@end