iOS缓存文件大小显示功能和一键清理功能的实现方法

#pragma mark - 计算缓存大小- (NSString *)getCacheSize{//定义变量存储总的缓存大小long long sumSize = 0;//01.获取当前图片缓存路径NSString *cacheFilePath = [NSHomeDirectory() stringByAppendingPathComponent:@"Library/Caches"];//02.创建文件管理对象NSFileManager *filemanager = [NSFileManager defaultManager];//获取当前缓存路径下的所有子路径NSArray *subPaths = [filemanager subpathsOfDirectoryAtPath:cacheFilePath error:nil];//遍历所有子文件for (NSString *subPath in subPaths) {//1）.拼接完整路径NSString *filePath = [cacheFilePath stringByAppendingFormat:@"/%@",subPath];//2）.计算文件的大小long long fileSize = [[filemanager attributesOfItemAtPath:filePath error:nil]fileSize];//3）.加载到文件的大小sumSize += fileSize;}float size_m = sumSize/(1000*1000);return [NSString stringWithFormat:@"%.2fM",size_m];}#pragma mark - 清除缓存提示（UITableViewDataSourceDelegate）- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{if (indexPath.row == 0) {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];[alertView show];}}#pragma mark - UIAlertViewDelegate方法实现- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex{NSLog(@"代码执行到此");//判断点击的是确认键if (buttonIndex == 1) {//01......NSFileManager *fileManager = [NSFileManager defaultManager];//02.....NSString *cacheFilePath = [NSHomeDirectory() stringByAppendingPathComponent:@"Library/Caches"];//03......[fileManager removeItemAtPath:cacheFilePath error:nil];//04刷新第一行单元格NSIndexPath *indexPath = [NSIndexPath indexPathForItem:0 inSection:0];[_tableView reloadRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationFade];//05 ：04和05使用其一即可[_tableView reloadData];//刷新表视图}@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- (void)viewWillAppear:(BOOL)animated{[super viewWillAppear:YES];[_tableView reloadData];}