double size = [[SDImageCache sharedImageCache] getSize] / 1000.0 / 1000.0; 

[[SDImageCache sharedImageCache] clearDiskOnCompletion:^{ 
     
  // 清除完毕的处理。 
     
}]; 

- (void)fileSize{ 
 
  NSFileManager *manager = [NSFileManager defaultManager]; 
   
  NSString *cachePath = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject]; 
   
  NSArray *files = [manager subpathsOfDirectoryAtPath:cachePath error:nil]; // 递归所有子路径 
   
  NSInteger totalSize = 0; 
   
  for (NSString *filePath in files) { 
    NSString *path = [cachePath stringByAppendingPathComponent:filePath]; 
    // 判断是否为文件 
    BOOL isDir = NO; 
    [manager fileExistsAtPath:path isDirectory:&isDir]; 
    if (!isDir) { 
      NSDictionary *attrs = [manager attributesOfItemAtPath:path error:nil]; 
      totalSize += [attrs[NSFileSize] integerValue]; 
    } 
  } 
   
  NSLog(@"%d",totalSize); 
   
}