xamarin Forms：根据键盘高度向上移动视图

我正在使用 xamarin 表单。我用xaml设计了一个登录表单页面。我想在键盘出现时向上移动登录表单视图，以便文本字段和登录按钮在两个平台上都可见Android and IOS。如何计算键盘高度并通过动态计算键盘高度将登录表单视图向上移动。

下面是我的 xaml 代码：

<ContentPage>
    <ScrollView>
        <AbsoluteLayout HorizontalOptions="FillAndExpand" VerticalOptions="FillAndExpand">
            <Grid Padding="20, 30, 20, 20" RowSpacing="20" AbsoluteLayout.LayoutFlags="All" AbsoluteLayout.LayoutBounds="0,0,1,1">
                <Grid.RowDefinitions>
                    <RowDefinition Height="Auto" />
                    <RowDefinition Height="Auto" />
                    <RowDefinition Height="Auto" />
                    <RowDefinition Height="Auto" />
                    <RowDefinition Height="Auto" />
                    <RowDefinition Height="Auto" />
                </Grid.RowDefinitions>

                <Image Grid.Row="0" Source="login.png" HorizontalOptions="Center" VerticalOptions="Center"/>

                <Entry Grid.Row="2" x:Name="entryUserName" HorizontalOptions="Fill"  Placeholder="Username" PlaceholderColor="#707070" Text="{Binding UserName,Mode=TwoWay}" Margin="5"/>

                <BoxView Grid.Row="2" HeightRequest="1" HorizontalOptions="Fill" BackgroundColor="#707070" VerticalOptions="End"/>

                <Entry Grid.Row="3" x:Name="entryPassword" Text="{Binding Password,Mode=TwoWay}" Placeholder="Password" PlaceholderColor="#707070" Margin="5" HorizontalOptions="Fill" IsPassword="True"/>

                <BoxView Grid.Row="3" HeightRequest="1" HorizontalOptions="Fill" BackgroundColor="#707070" VerticalOptions="End"/>

                <Button Grid.Row="5" HorizontalOptions="Center" VerticalOptions="Center" Text="Login" Command="{Binding doLoginCommand}" CommandParameter="entryUserName,entryPassword" />

            </Grid>         
        </AbsoluteLayout>
    </ScrollView>
</ContentPage>

我不想对页面执行任何类型的自定义渲染。是否有任何资源可以通过它编写依赖服务来计算不同移动视图跨平台的键盘高度。 我经历过this但它有某种我不想要的自定义渲染。

选项1：

安卓： 将其添加到您的清单中：

<activity //Your MainActivity
        android:windowSoftInputMode="stateVisible|adjustResize" ... >
        ...
</activity>

IOS： 添加这个 nuget 包：https://www.nuget.org/packages/Xam.Plugins.Forms.KeyboardOverlap/

并初始化它：

Xamarin.Forms.Init();//platform specific init
KeyboardOverlapRenderer.Init ();

选项2：

将此代码添加到您的 Page 类中：

        protected override void OnAppearing()
        {
            base.OnAppearing();
            entryUserName.Focused += InputFocused;
            entryPassword.Focused += InputFocused;
            entryUserName.Unfocused += InputUnfocused;
            entryPassword.Unfocused += InputUnfocused;
        }

        protected override void OnDisappearing()
        {
            base.OnDisappearing();
            entryUserName.Focused -= InputFocused;
            entryPassword.Focused -= InputFocused;
            entryUserName.Unfocused -= InputUnfocused;
            entryPassword.Unfocused -= InputUnfocused;
        }
        void InputFocused(object sender, EventArgs args){
            Content.LayoutTo(new Rectangle(0,-360, Content.Bounds.Width, Content.Bounds.Height));
        }

        void InputUnfocused(object sender, EventArgs args){
            Content.LayoutTo(new Rectangle(0,0, Content.Bounds.Width, Content.Bounds.Height));
        }