iOS清除缓存机制

应用程序中基本上都要有清除缓存功能，下面是自己写的一个清除缓存的事例，有需要的可以看下。大神勿喷，谢谢！

效果图如下

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"TableCell"];if (cell == nil){    cell =[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleValue1 reuseIdentifier:@"TableCell"];    cell.selectionStyle = UITableViewCellSelectionStyleNone;    cell.detailTextLabel.font=[UIFont systemFontOfSize:14];  }if (indexPath.row==0) {    cell.textLabel.text = @"清理缓存";    cell.detailTextLabel.text=[NSString stringWithFormat:@"%.2fM",[self filePath]];}else{    cell.imageView.image = [UIImage imageNamed:@"206040274942060663"];}return cell;}}

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {    [tableView deselectRowAtIndexPath:indexPath animated:YES];if (indexPath.row==0) {    //清除缓存    UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:nil                                                        message:@"是否清理缓存？"                                                       delegate:self                                              cancelButtonTitle:@"取消"                                              otherButtonTitles:@"确定", nil];    [alertView show];        }  }// 显示缓存大小-( float )filePath{NSString * cachPath = [ NSSearchPathForDirectoriesInDomains ( NSCachesDirectory , NSUserDomainMask , YES ) firstObject ];return [ self folderSizeAtPath :cachPath];    }   //1:首先我们计算一下 单个文件的大小 - ( long long ) fileSizeAtPath:( NSString *) filePath{    NSFileManager * manager = [ NSFileManager defaultManager ];     if ([manager fileExistsAtPath :filePath]){      return [[manager attributesOfItemAtPath :filePath error : nil ] fileSize ];   }  return 0 ;}//2: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 );}-(void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex{   if (buttonIndex == 1 ) {    [self clearFile];    }}// 清理缓存- (void)clearFile{ dispatch_async(                     dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0)               , ^{//地址                   NSString * cachPath = [   NSSearchPathForDirectoriesInDomains ( NSCachesDirectory , NSUserDomainMask , YES ) firstObject ];                   NSArray * files = [[ NSFileManager defaultManager ] subpathsAtPath :cachPath];                   NSLog ( @"cachpath = %@" , cachPath);                   for ( NSString * p in files) {                       NSError * error = nil ;                       NSString * path = [cachPath stringByAppendingPathComponent :p];                       if ([[ NSFileManager defaultManager ] fileExistsAtPath :path]) {                           [[ NSFileManager defaultManager ] removeItemAtPath :path error :&error];                       }                   }                   [ self performSelectorOnMainThread : @selector (clearCachSuccess) withObject : nil waitUntilDone : YES ];});   }  -(void)clearCachSuccess{    NSLog ( @" 清理成功 " );    NSIndexPath *index=[NSIndexPath indexPathForRow:0 inSection:0];//刷新某一行数据[_tableView reloadRowsAtIndexPaths:[NSArray arrayWithObjects:index,nil] withRowAnimation:UITableViewRowAnimationNone];}
代码通道：https://github.com/Gang679/GZBase 记得星一下，谢谢！