ioS 计算缓存和清除缓存

来源：互联网发布：手机淘宝助理在哪里找编辑：程序博客网时间：2024/05/22 12:00

转载：http://www.tuicool.com/articles/nuaERjQ

#pragma mark - 计算缓存大小 2 - (NSString *)getCacheSize 3 { 4     //定义变量存储总的缓存大小 5     long long sumSize = 0; 6      7     //01.获取当前图片缓存路径 8     NSString *cacheFilePath = [NSHomeDirectory() stringByAppendingPathComponent:@"Library/Caches"]; 9     10     //02.创建文件管理对象11     NSFileManager *filemanager = [NSFileManager defaultManager];12     13         //获取当前缓存路径下的所有子路径14     NSArray *subPaths = [filemanager subpathsOfDirectoryAtPath:cacheFilePath error:nil];15         //遍历所有子文件16     for (NSString *subPath in subPaths) {17             //1）.拼接完整路径18         NSString *filePath = [cacheFilePath stringByAppendingFormat:@"/%@",subPath];19             //2）.计算文件的大小20         long long fileSize = [[filemanager attributesOfItemAtPath:filePath error:nil]fileSize];21             //3）.加载到文件的大小22         sumSize += fileSize;23     }24     float size_m = sumSize/(1000*1000);25     return [NSString stringWithFormat:@"%.2fM",size_m];26     27 }28 #pragma mark - 清除缓存提示（UITableViewDataSourceDelegate）29 - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath30 {31     if (indexPath.row == 0) {32         UIAlertView *alertView = [[UIAlertView alloc]initWithTitle:@"缓存清除" message:@"确定清除缓存?" delegate:self cancelButtonTitle:@"取消" otherButtonTitles:@"确定",nil];33         [alertView show];34     }35 }36 #pragma mark - UIAlertViewDelegate方法实现37 - (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex38 {39     NSLog(@"代码执行到此");40     //判断点击的是确认键41     if (buttonIndex == 1) {42         //01......43         NSFileManager *fileManager = [NSFileManager defaultManager];44         //02.....45         NSString *cacheFilePath = [NSHomeDirectory() stringByAppendingPathComponent:@"Library/Caches"];46         //03......47         [fileManager removeItemAtPath:cacheFilePath error:nil];48         49         //04刷新第一行单元格50         NSIndexPath *indexPath = [NSIndexPath indexPathForItem:0 inSection:0];51         [_tableView reloadRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationFade];52         53         //05 ：04和05使用其一即可54        [_tableView reloadData];//刷新表视图55     }56 @pragma -mark -放置于.m文件首段较为合适，本DEMO仅做功能性展示，实时监测缓存大小，从其他界面跳转到本页面，也需要刷新下表视图57 - (void)viewWillAppear:(BOOL)animated58 {59     [super viewWillAppear:YES];60     [_tableView reloadData];61 }

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