ios - iOS 7 中的下拉刷新

Question

我正在尝试让下拉刷新功能在我的 TableView 中在 iOS 7 上正常工作。在 viewDidLoad 上，我有:

self.refreshControl = [[UIRefreshControl alloc] init];

    [self.refreshControl addTarget:self action:@selector(refreshInvoked:forState:) forControlEvents:UIControlEventValueChanged];

然后我运行:

-(void) refreshInvoked:(id)sender forState:(UIControlState)state {
    // Refresh table here...
    [_allEntries removeAllObjects];
    [self.tableView reloadData];
    [self refresh];
}

当刷新方法调用的请求完成时，在 didCompleteRequest 代码中，我有:

[self.refreshControl endRefreshing];

在 iOS 6 上，这意味着当您在 table view 上下拉时，它会显示圆形箭头，当您拉动时它会被拉长，拉得足够远后，它会刷新。不过现在，我看不到圆形箭头，只有一个 UIActivityIndi​​cator。它也有时会工作，有时不会。我错过了什么？

Answer 1

在您的 UITableView 中添加 UIRefreshControl...

1) 在 ViewDidLoad..

- (void)viewDidLoad
{
    [super viewDidLoad];

    //to add the UIRefreshControl to UIView
    UIRefreshControl *refreshControl = [[UIRefreshControl alloc] init];
    refreshControl.attributedTitle = [[NSAttributedString alloc] initWithString:@"Please Wait..."]; //to give the attributedTitle
    [refreshControl addTarget:self action:@selector(refresh:) forControlEvents:UIControlEventValueChanged];
    [tblVideoView addSubview:refreshControl];
}

2) 调用相关方法刷新UITableView数据...

- (void)refresh:(UIRefreshControl *)refreshControl
{
    [self refreshTableData]; //call function you want
    [refreshControl endRefreshing];
}

或用于 Swift

 let refreshControl : UIRefreshControl = UIRefreshControl.init()
 refreshControl.attributedTitle = NSAttributedString.init(string: "Please Wait...")
 refreshControl.addTarget(self, action: #selector(refresh), forControlEvents: UIControlEvents.ValueChanged)
 feedTable.addSubview(refreshControl)

 func refresh(refreshControl:UIRefreshControl){
      self.refreshTableData()//call function you want
      refreshControl.endRefreshing()
 }