ios7 : Pull to refresh does not show up on simulator

Question

我对 iOS 很陌生编程和一个类(class)项目，我试图实现“拉动刷新功能”

我试过了link ，并在我的 MoviesViewController 中实现相同

- (void)viewDidLoad
{
    [super viewDidLoad];
    self.moviesTableView.delegate = self;
    self.moviesTableView.dataSource = self;

    // pull to refresh
    UIRefreshControl *refresh = [[UIRefreshControl alloc] init];
    refresh.attributedTitle = [[NSAttributedString alloc] initWithString:@"Pull to Refresh"];
    [refresh addTarget:self action:@selector(refreshView:) forControlEvents:UIControlEventValueChanged];
    self.refreshControl = refresh;

    // progress bar
    MBProgressHUD *HUD = [self getLoadingController];
    [HUD showWhileExecuting:@selector(generateMovies) onTarget:self withObject:nil animated:YES];

    self.moviesTableView.rowHeight = 100;
    [self.moviesTableView registerNib:[UINib nibWithNibName:@"MovieViewCell" bundle:nil] forCellReuseIdentifier:@"MovieViewCell"];
}

和

-(void)refreshView:(UIRefreshControl *)refresh {
    refresh.attributedTitle = [[NSAttributedString alloc] initWithString:@"Refreshing data..."];

    // custom logic: get data from server
    NSLog(@"refreshing view");


    NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
    [formatter setDateFormat:@"MMM d, h:mm a"];
    NSString *lastUpdated = [NSString stringWithFormat:@"Last updated on %@",[formatter stringFromDate:[NSDate date]]];
    refresh.attributedTitle = [[NSAttributedString alloc] initWithString:lastUpdated];
    [refresh endRefreshing];
}

但是当我在模拟器中运行它时，我在拉下电影表时看不到它。

这里可能是什么问题？

Answer 1

我认为您缺少将 HUD 添加到刷新控件中。根据您的 View 结构，您需要以下内容:

[self.refreshLoadingView addSubview:self.hud];

我们需要查看您的其余代码来调试问题，但这是我写的一个教程，解释了 iOS(包括 Swift)的自定义下拉刷新控件: http://www.jackrabbitmobile.com/design/ios-custom-pull-to-refresh-control/