如何在Android的Xamarin.Forms中的NavigationBar的左侧添加ToolbarItem?

问题描述：

我需要要有关闭按钮(在这种情况下)导航栏的左侧，如下.我仅在弹出窗口中需要它，因此其他元素/导航没有潜在的问题.

I need to have a close button (in this particular case) on the left of Navigation Bar, as below. I need it only for popups, so there is no potential issues with other elements/navigations.

Google对此有一些建议，但我只看到了iOS示例(在iOS custom renderer中处理起来不是一件大事)，但没有任何提示(轻松处理) >)和 Android .

There are a few suggestions in Google regarding this, but I saw only iOS examples (and this is not a big thing to handle in iOS custom renderer), but no hints how to handle it (easily) with Android.

只需清楚一点，Xamarin.Forms需要与此定义类似的代码(或隐藏代码):

Just to be clear, it need it for Xamarin.Forms defining similar to this (or codebehind):

<ContentPage.ToolbarItems>
    <ToolbarItem Text="X" Priority="-1" Command="{Binding GoCancel}"/>
    <ToolbarItem Icon="icon_save" Command="{Binding GoSave}"/>
</ContentPage.ToolbarItems>

有什么想法吗?

答

使用Xamarin Forms 3.2，可以使用NavigationBar来处理更复杂场景的新方法.它叫做TitleView.

With Xamarin Forms 3.2 there is a new way of handling more complex scenario's with the NavigationBar. It's called the TitleView.

使用此按钮，您可以将所需的任何View推入NavigationBar.

With this you can push any View you want unto the NavigationBar.

示例XAML:

<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             x:Class="NavigationPageTitleView.TitleViewPage">
    <NavigationPage.TitleView>
        <Slider HeightRequest="44" WidthRequest="300" />
    </NavigationPage.TitleView>
    ...
</ContentPage>

More info about it here https://docs.microsoft.com/en-us/xamarin/xamarin-forms/app-fundamentals/navigation/hierarchical#displaying-views-in-the-navigation-bar and example project can be found here https://developer.xamarin.com/samples/xamarin-forms/Navigation/TitleView/

如何在Android的Xamarin.Forms中的NavigationBar的左侧添加ToolbarItem?

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