多次按下按钮会加载多个页面(Android)

Question

我想解决这个问题,当我按下按钮几次 - 提供许多相同的页面.我在这里找到了这样的代码

var stack = Navigation.NavigationStack;
if (stack[stack.Count - 1].GetType() != typeof(DetailsPage))
await Navigation.PushAsync (new DetailsPage ());

Navigation.NavigationStack - 工作正常.Navigation.ModalStack - 没有Navigation.NavigationStack获得名称.

请帮我解决这个问题.

Answer 1

关于这个常见问题有不同的线索,我可以在论坛上看到你已经评论过它,还有NavigationExtensions类:

public static class NavigationExtensions
{
    public static async Task PushModalAsyncSingle(this INavigation nav, Page page, bool animated = false)
    {
        if (App.Navigation.ModalStack.Count == 0 || 
            App.Navigation.ModalStack.Last().GetType() != page.GetType())
        {
            await nav.PushModalAsync(page, animated);
        }
    }

    public static async Task PushAsyncSingle(this INavigation nav, Page page, bool animated = false)
    {
        if (App.Navigation.NavigationStack.Count == 0 ||
            App.Navigation.NavigationStack.Last().GetType() != page.GetType())
        {
            await nav.PushAsync(page, animated);
        }
    }
}

以下是讨论:https: //forums.xamarin.com/discussion/29787/double-tapping-in-xamarin-forms-on-android