清理app应用程序的缓存

#define CacheDirectory [NSSearchPathForDirectoriesInDomains(NSCachesDirectory,NSUserDomainMask,YES) objectAtIndex:0]//程序缓存目录

#pragma mark - 清理缓存

- (void)clearCache{

    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{

        NSArray * files=[[NSFileManager defaultManager] subpathsAtPath:CacheDirectory];

        for (NSString * p in files) {

            NSError * error;

            NSString * path=[CacheDirectory stringByAppendingPathComponent:p];

            if ([[NSFileManager defaultManager] fileExistsAtPath:path]) {

                [[NSFileManager defaultManager] removeItemAtPath:path error:&error];

            }

        }

        [self performSelectorOnMainThread:@selector(clearCacheSuccess) withObject:nil waitUntilDone:YES];

    });

}

//返回多少M

 float m=[self folderSizeAtPath:CacheDirectory];

        cell.textLabel.text=[NSString stringWithFormat:@"     %@                                        %.2fM",[moreArray objectAtIndex:indexPath.row],m];

#pragma mark - 遍历文件夹获得文件夹大小 返回多少M

- (float)folderSizeAtPath:(NSString *)folderPath{

    NSFileManager * manager=[NSFileManager defaultManager];

    if (![manager fileExistsAtPath:folderPath]) {

        return 0;

    }

    NSEnumerator * childFilesEnumerator=[[manager subpathsAtPath:folderPath]objectEnumerator];

    NSString * fileName;

    long long folderSize=0;

    while ((fileName =[childFilesEnumerator nextObject])!=nil) {

        NSString * fileAbsolutePath=[folderPath stringByAppendingPathComponent:fileName];

        folderSize +=[self fileSizeAtPath:fileAbsolutePath];

    }

    return folderSize/(1024.0 * 1024.0);

}