向UIScrollView添加UIRefreshControl

Question

我只是想简单地添加一个UIRefreshControl到on滚动视图中--由于某种原因，当我向下拉滚动条时，什么也没有发生。没有ActivityView，就没有动作。它就会反弹回来就像什么都没发生一样。

这就是我到目前为止所知道的：

- (void)viewDidLoad {
[super viewDidLoad];

[scroller setAutoresizesSubviews:YES];

UIRefreshControl *refreshControl = [[UIRefreshControl alloc] init];
[refreshControl addTarget:self action:@selector(handleRefresh:) forControlEvents:UIControlEventValueChanged];
[self.scroller addSubview:refreshControl];

//populate the scroller with data
[self grabData];

}

-(void)handleRefresh:(UIRefreshControl *)refresh {
// Reload my data
[self grabData];
}

Answer 1

这一条应该很有帮助

UIRefreshControl *refreshControl;

- (void)viewDidLoad {
  [super viewDidLoad];

  refreshControl = [[UIRefreshControl alloc]init];
  [self.scrollView addSubview:refreshControl];
  [refreshControl addTarget:self action:@selector(refreshData) forControlEvents:UIControlEventValueChanged]; 

}

- (void)refreshData {
  //TODO: reload your data and end refreshing
  [refreshControl endRefreshing];
}

如果要获取一些数据，则在完成接收数据后，应调用endRefreshing和reloadData

Answer 2

对我来说起作用的是让refreshControl成为类的一个变量，然后使用它。

例如：

class className: UIViewController{
    var refreshControl:UIRefreshControl!
    override func viewDidLoad() {
        super.viewDidLoad()
        self.refreshControl = UIRefreshControl()
        self.refreshControl.addTarget(self, action: Selector("getPrint"), forControlEvents: UIControlEvents.ValueChanged)
        refreshControl.tintColor = UIColor.whiteColor()
        self.refreshControl.backgroundColor = UIColor.clearColor()
        self.refreshControl?.endRefreshing()
        self.scrollView.addSubview(self.refreshControl)
    }
}