清除缓冲

- (NSString *)clearTmpPics
{
    [[SDImageCache sharedImageCache] clearDisk];
    [[SDImageCache sharedImageCache] clearMemory];//可有可无
    float tmpSize = [[SDImageCache sharedImageCache] getSize]/1024/1024;
    NSString *clearCacheName = tmpSize >= 1 ? [NSString stringWithFormat:@"%.1fMB",tmpSize] : [NSString stringWithFormat:@"%.0fKB",tmpSize * 1024];
    return clearCacheName;
}

- (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex {
    if (actionSheet.tag == 1)
    {  //清理缓存
        if (actionSheet.cancelButtonIndex != buttonIndex) {
            MBProgressHUD *hud = [[MBProgressHUD alloc] initWithView:self.navigationController.view];
            [self.navigationController.view addSubview:hud];
            hud.labelText = @"正在清除缓存....";
            __weak typeof (self)weakSelf = self;
            [hud showAnimated:YES whileExecutingBlock:^{
                // 模拟删除 要时间
                sleep(1.0);
            } completionBlock:^{
                [hud removeFromSuperview];
                NSString *clearCacheName =  [weakSelf clearTmpPics];
                [MBProgressHUD showSuccess:@"清理成功"];
                SliderModel *model = weakSelf.dataSource[1];
                model.content = clearCacheName;
                [weakSelf.tableView reloadRowsAtIndexPaths:[NSArray arrayWithObjects:[NSIndexPath indexPathForRow:1 inSection:0], nil]
                                          withRowAnimation:UITableViewRowAnimationNone];
            }];
            
        }
    }

}