//获取缓存文件路径
-(NSString *)getCachesPath{// 获取Caches目录路径NSArray *paths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);NSString *cachesDir = [paths objectAtIndex:0];//指定文件名// NSString *filePath = [cachesDir stringByAppendingPathComponent:@"com.nickcheng.NCMusicEngine"];return cachesDir;
}

//计算缓存文件的大小
- (long long) fileSizeAtPath:(NSString*) filePath{NSFileManager* manager = [NSFileManager defaultManager];if ([manager fileExistsAtPath:filePath]){//        //取得一个目录下得所有文件名
//        NSArray *files = [manager subpathsAtPath:filePath];
//        NSLog(@"files1111111%@ == %ld",files,files.count);
//
//        // 从路径中获得完整的文件名（带后缀）
//        NSString *exe = [filePath lastPathComponent];
//        NSLog(@"exeexe ====%@",exe);
//
//        // 获得文件名（不带后缀）
//        exe = [exe stringByDeletingPathExtension];
//
//        // 获得文件名（不带后缀）
//        NSString *exestr = [[files objectAtIndex:1] stringByDeletingPathExtension];
//        NSLog(@"files2222222%@  ==== %@",[files objectAtIndex:1],exestr);return [[manager attributesOfItemAtPath:filePath error:nil] fileSize];}return 0;
}

dispatch_async(
dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0)
, ^{NSString *cachPath = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory,NSUserDomainMask, YES) objectAtIndex:0];NSArray *files = [[NSFileManager defaultManager] subpathsAtPath:cachPath];NSLog(@"files :%d",[files count]);for (NSString *p in files) {NSError *error;NSString *path = [cachPath stringByAppendingPathComponent:p];if ([[NSFileManager defaultManager] fileExistsAtPath:path]) {[[NSFileManager defaultManager] removeItemAtPath:path error:&error];}}[self performSelectorOnMainThread:@selector(clearCacheSuccess) withObject:nilwaitUntilDone:YES];});-(void)clearCacheSuccess
{NSLog(@"清理成功");
}

dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{//获取缓存目录NSString *cachPath = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory,NSUserDomainMask, YES) objectAtIndex:0];NSError *error;if ([[NSFileManager defaultManager] fileExistsAtPath:cachPath]) {//如果存在就删除[[NSFileManager defaultManager] removeItemAtPath:cachPath error:&error];}[self performSelectorOnMainThread:@selector(clearCacheSuccess) withObject:nil waitUntilDone:YES];});//计算缓存文件的大小，多少M
- (NSString *) fileSizeAtPath:(NSString*)cachPath{NSFileManager* manager = [NSFileManager defaultManager];if ([manager fileExistsAtPath:cachPath]){unsigned long long length  = [[manager attributesOfItemAtPath:cachPath error:nil] fileSize];float ff = length/1024.0/1024.0; //换算成多少MNSString *size = [NSString stringWithFormat:@"%0.2fM",ff];return size;}return 0;
}//清理缓存后刷新
-(void)clearCacheSuccess
{NSString *cachPath = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory,NSUserDomainMask, YES) objectAtIndex:0];NSString *size = [self fileSizeAtPath:cachPath];_setting.cache = size;[self.tableView reloadData];UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"清理成功" message:nil delegate:nil cancelButtonTitle:@"确定" otherButtonTitles:nil];[alertView show];
}