适用于iOS6之后的苹果提供的下拉刷新

一：iOS6.0及以后：

• 下拉刷新控件UIRefreshControl
• TableView属性：refreshControl

二：使用

- (void)colseTheTB
{
    [self dismissViewControllerAnimated:YES completion:nil];
}

- (void)viewDidLoad
{
    [super viewDidLoad];

    self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonItemStylePlain target:self action:@selector(colseTheTB)];
    
    //数据源
    self.dataArray = [[NSMutableArray alloc]initWithCapacity:10];
    for (int i = 0; i < 10; i ++) {
        [_dataArray addObject:[NSString stringWithFormat:@"%d",i]];
    }
    
    
    //适用于 iOS6 之后，系统自带的下拉刷新控件 UIRefreshControl
    UIRefreshControl *osRefresh = [[UIRefreshControl alloc]init];
    osRefresh.tintColor = [UIColor lightGrayColor];
    osRefresh.attributedTitle = [[NSAttributedString alloc]initWithString:@"下拉刷新"];
    [osRefresh addTarget:self action:@selector(doPullRefresh:) forControlEvents:UIControlEventValueChanged];
    self.refreshControl = osRefresh;

}

- (void)doPullRefresh:(UIRefreshControl *)refresh
{
    if (refresh.refreshing) {
        refresh.attributedTitle = [[NSAttributedString alloc]initWithString:@"正在刷新"];
        [self performSelector:@selector(handleTheRefresh) withObject:nil afterDelay:2];
    }
    
    else
    {
        refresh.attributedTitle = [[NSAttributedString alloc]initWithString:@"释放刷新"];

    }
}

- (void)handleTheRefresh
{
    NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
    [formatter setDateFormat:@"MMM d, h:mm:ss a"];
    NSString *lastUpdated = [NSString stringWithFormat:@"时间:%@", [formatter stringFromDate:[NSDate date]]];
    self.refreshControl.attributedTitle = [[NSAttributedString alloc] initWithString:lastUpdated] ;
    
    static int num = 0;
    num--;
    [_dataArray insertObject:[NSString stringWithFormat:@"%d",num] atIndex:0];
    
    [self.refreshControl endRefreshing];
    [self.tableView reloadData];
}

 三：显示情况

• 在iOS6上显示情况，请参见 qq for iPhone版本 app
• 在iOS7 显示情况，是菊花动画，一片一片的铺满