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/(10001000);
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 *)indexPath
30 {
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)buttonIndex
38 {
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)animated
58 {
59 [super viewWillAppear:YES];
60 [_tableView reloadData];
61 }