封装缓存的类方法

// 获取磁盘大小

//获取硬盘大小
+ (CGFloat)getDiskSize
{
    NSString *libPath = [NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES) objectAtIndex:0];
    NSLog(@"%@", libPath);
    // 初始化文件管理者
    NSFileManager *manager = [NSFileManager defaultManager];
    // 获取lib下所有路径
    NSArray *libAllPath = [manager subpathsAtPath:libPath];
    NSInteger size = 0;
    for (NSString *path in libAllPath) {
        if (![path containsString:@"Preferences"]) {
            //把路径拼接全
            NSString *pathA = [libPath stringByAppendingPathComponent:path];
            //获取文件的所有信息
            NSDictionary *fileAttri = [manager attributesOfItemAtPath:pathA error:nil];
            //获取文件大小
            size += [fileAttri[@"NSFileSize"] integerValue];
        }
    }
    return size/1024.0/1024.0;
}

清除缓存的方法

//清除缓存
+ (void)clearDisk
{
    NSString *libPath = NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES)[0];
    //初始化文件管理者
    NSFileManager *mgr = [NSFileManager defaultManager];
    //获取lib下所有路径
    NSArray *libAllPath = [mgr subpathsAtPath:libPath];

    for (NSString *path in libAllPath) {
        if (![path containsString:@"Preferences"]) {
            //把路径拼接全
            NSString *pathA = [libPath stringByAppendingPathComponent:path];
            //移除文件
            [mgr removeItemAtPath:pathA error:nil];
        }
    }
}

调用时  在清除缓存的cell中显示垃圾大小

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{

    static NSString *CellIdentifier = @"Cell";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"cell"];
    if (cell == nil) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleValue1 reuseIdentifier:CellIdentifier];
    }
    switch (indexPath.row) {
        case 0:
            cell.textLabel.text = @"活动收藏";
            break;
        case 1:
            cell.textLabel.text = @"电影收藏";
            break;
        case 2:
        {
            cell.textLabel.text = @"清除缓存";
            NSString *size = [NSString stringWithFormat:@"%.2fM",[ClearDiskManager getDiskSize]];
            cell.detailTextLabel.text = size;
            break;
        }
        default:
            break;
    }

    cell.backgroundColor = [UIColor cyanColor];

    return cell;
}

//  点击cell时清理缓存

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    switch (indexPath.row) {
        case 1:
        {
            ListTableViewController *listVC = [[ListTableViewController alloc] init];
            [self.navigationController pushViewController:listVC animated:YES];
        break;
        }
        case 0:
        {
           ActivityTableViewController *activityVC = [[ActivityTableViewController alloc] init];
            [self.navigationController pushViewController:activityVC animated:YES];
            break;
        }
        case 2:
        {
            UIAlertController *alerController = [UIAlertController alertControllerWithTitle:@"提示" message:@"清除缓存之后可能耗费一点你的流量" preferredStyle:UIAlertControllerStyleAlert];
            UIAlertAction *action = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
                [self dismissViewControllerAnimated:YES completion:nil];
            }];
            UIAlertAction *action1 = [UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
                [ClearDiskManager clearDisk];
                [self.tableView reloadData];
            }];
            [alerController addAction:action];
            [alerController addAction:action1];
            [self presentViewController:alerController animated:YES completion:nil];
        }
        default:
            break;
    }
}