是什么原因导致iOS中的Subviews无法捕获触摸?

时间:2013-06-24 20:25:41

标签: ios xamarin.ios xamarin

我正在开发Xamarin Studio(MonoTouch),但概念是一样的。

我有一个UIViewController,在UIViewController中,我添加了几个子视图,每个子视图都需要响应tap事件。我将UITapGestureRecognizer附加到我的子视图中,但它们不会触发。查看“AddExploreButton()”和“AddFollowingButton()”。

如果我将手势添加到包含的视图(MyMenu.View),它会捕获轻击手势,但我需要子视图来处理事件。

是什么原因导致我的子视图无法接收手势? (注意我几乎在所有事情上都设置了UserInteractionEnabled = true。)

其次,如果这是不正确的编码模式,我怎么能将子视图连接到触摸事件呢?

public class MyMenu : UIViewController
{
    private UIImageView _settingsButton;
    private TrendingMenuButton _trendingButton;
    private FollowingMenuButton _followingButton;
    private ExploreMenuButton _exploreButton;
    private NotificationsMenuButton _notificationsButton;

    public MyMenu() { }

    public override void ViewDidLoad() {
        base.ViewDidLoad();

        View.Hidden = true;
        View.UserInteractionEnabled = true;
        View.BackgroundColor = UIColor.FromPatternImage(UIImage.FromBundle("images/menu_bg.png"));
        View.Frame = new RectangleF(0, CityTitleBar.NAV_HEIGHT, 320, 349);

        AddSettingsButton();
        AddTrendingButton();
        AddFollowingButton();
        AddExploreButton();
        AddNotificationsButton();
    }

    private void AddSettingsButton() {
        _settingsButton = new UIImageView(UIImage.FromBundle("images/icon_cogwheel.png"));
        _settingsButton.Frame = new RectangleF(new PointF(269, 12), _settingsButton.Frame.Size);
        View.AddSubview(_settingsButton);
    }

    private void AddTrendingButton() {
        _trendingButton = new TrendingMenuButton(42, 33);
        View.AddSubview(_trendingButton);
    }

    private void AddFollowingButton() {
        _followingButton = new FollowingMenuButton(182, 33);
        _followingButton.AddGestureRecognizer(new UITapGestureRecognizer((g) => {
            MenuHelper.HideMenu();
            NavigationHelper.LoadScreen(new FavoritesScreen());
        }));
        View.AddSubview(_followingButton);
    }

    private void AddExploreButton() {
        _exploreButton = new ExploreMenuButton(42, 187);
        _exploreButton.AddGestureRecognizer(new UITapGestureRecognizer((g) => {
            MenuHelper.HideMenu();
            NavigationHelper.LoadScreen(new ExploreScreen());
        }));
        View.AddSubview(_exploreButton);
    }

    private void AddNotificationsButton() {
        _notificationsButton = new NotificationsMenuButton(182, 187);
        View.AddSubview(_notificationsButton);
    }
}

1 个答案:

答案 0 :(得分:2)

我发现了问题。我正在使用UIView.SizeToFit()来生成宽度和高度。

根据这个:Having trouble getting UIView sizeToFit to do anything meaningful但是,UIView.SizeToFit()没有做任何事情。

如果没有适当的帧大小,尽管可见,但子视图无法捕获触摸事件。