iOS上不全局支持PushAsync，请使用NavigationPage

问题描述

当我处理ListView项的Tap事件时，一切工作都很好，但是当我在TabbedPage中使用它时，它显示了异常，请提前提供解决此问题的方法.

Everything is working fine when I am handling the Tap event of a ListView item, but when I use this in a TabbedPage it shows the exception please provide a solution to this problem thanks in advance.

这是Xaml代码:

    <?xml version="1.0" encoding="utf-8"?>
    <ContentPage xmlns="http://xamarin.com/schemas/2014/forms" xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml" xmlns:local="clr-namespace:NavTest" x:Class="NavTest.NavTestPage" Title="Home">
        <ContentPage.Content>
            <StackLayout Orientation="Vertical" VerticalOptions="Center">
                <Label Text="Welcome to Xamarin Forms!" VerticalOptions="Center" HorizontalOptions="Center" />
                <!--<Button Text="Go to " BackgroundColor="Lime" VerticalOptions="Center" Clicked="Handle_Clicked" >
            </Button>-->
                <ListView x:Name="myListView" ItemSelected="Handle_ItemSelected">
                    <ListView.ItemTemplate>
                        <DataTemplate>
                            <ViewCell>
                                <Label Text="{Binding}" VerticalOptions="Center" HorizontalOptions="Center" />
                            </ViewCell>
                        </DataTemplate>
                    </ListView.ItemTemplate>
                </ListView>
            </StackLayout>
        </ContentPage.Content>
    </ContentPage>

这是OnClick处理程序:

Here's the OnClick Handler:

    async void Handle_Clicked(object sender, System.EventArgs e)
    {
        await  Navigation.PushAsync(new Page1());
    }

推荐答案

仅在iOS中运行时才会出现此错误.

This error will come while running in iOS only.

在App.cs根页面(开始页)中，如下所示

 public App()
  {
      MainPage=new NavigationPage(new LoginPage());
  }

现在，我们可以在全局范围内使用PushAsyn()

Now, We can use PushAsyn() in Globally

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