SDWebImage -- 判断缓存图片的大小（所占字节数）、手動清除緩存的方法

1.找到SDImageCache类

2.添加如下方法：

- (float)checkTmpSize{    float totalSize = 0;    NSDirectoryEnumerator *fileEnumerator = [[NSFileManager defaultManager] enumeratorAtPath:diskCachePath];    for (NSString *fileName in fileEnumerator)    {        NSString *filePath = [diskCachePath stringByAppendingPathComponent:fileName];        NSDictionary *attrs = [[NSFileManager defaultManager] attributesOfItemAtPath:filePath error:nil];        unsigned long long length = [attrs fileSize];        totalSize += length / 1024.0 / 1024.0;    }//    NSLog(@"tmp size is %.2f",totalSize);    return totalSize;}

新版的SDImageCache类，已增加此方法

[objc] view plaincopy

1. [[SDImageCache sharedImageCache] getSize];  

3.在设置里这样使用

[objc] view plaincopy

1. #pragma 清理缓存图片  
2.   
3. - (void)clearTmpPics  
4. {  
5.     [[SDImageCache sharedImageCache] clearDisk];  
6.   
7. //    [[SDImageCache sharedImageCache] clearMemory];//可有可无  
8.   
9.     DLog(@"clear disk");      
10.   
11.     float tmpSize = [[SDImageCache sharedImageCache] checkTmpSize];  
12.   
13.     NSString *clearCacheName = tmpSize >= 1 ? [NSString stringWithFormat:@"清理缓存(%.2fM)",tmpSize] : [NSString stringWithFormat:@"清理缓存(%.2fK)",tmpSize * 1024];  
14.   
15.     [configDataArray replaceObjectAtIndex:2 withObject:clearCacheName];  
16.   
17.     [configTableView reloadData];  
18. }