Question

如何放大活动的输入字段。活动 - 按

后将触发此地点激活的地方

Example image

Answer 1

查看适用于Xamarin Forms 3.0的新Visual State Manager https://docs.microsoft.com/en-us/xamarin/xamarin-forms/user-interface/visual-state-manager 它允许您为不同的状态设置样式。常见状态为Normal，Focused，Disabled。你可以，例如增加FontSize并与其他州做同样的事情。（看一下给定的链接）

您想要的状态是Focused。

<Entry FontSize="18">
<VisualStateManager.VisualStateGroups>
    <VisualStateGroup x:Name="CommonStates">
        <VisualState x:Name="Normal">
            <VisualState.Setters>
                <Setter Property="BackgroundColor" Value="Lime" />
            </VisualState.Setters>
        </VisualState>

        <VisualState x:Name="Focused">
            <VisualState.Setters>
                <Setter Property="FontSize" Value="36" />
            </VisualState.Setters>
        </VisualState>

        <VisualState x:Name="Disabled">
            <VisualState.Setters>
                <Setter Property="BackgroundColor" Value="Pink" />
            </VisualState.Setters>
        </VisualState>
    </VisualStateGroup>
</VisualStateManager.VisualStateGroups>
</Entry>

Answer 2

您可以使用Scale方法来增加Entry的大小。每个视图都有可用于增加大小的属性Scale;

entry.Scale =2;

Answer 3

有很多方法可以实现这一目标。

其中一个是改变位置属性，如Margin：

<ContentPage.Resources>
    <ResourceDictionary>
        <Style TargetType="Entry">
            <Style.Setters>
                <Setter Property="Margin" Value="20,30,30,30"/>
                <Setter Property="HorizontalOptions" Value="FillAndExpand"/>
                <Setter Property="VerticalOptions" Value="Center"/>
                <Setter Property="BackgroundColor" Value="AliceBlue"/>
            </Style.Setters>
        </Style>
        <Style TargetType="Image">
            <Style.Setters>
                <Setter Property="HorizontalOptions" Value="Center"/>
                <Setter Property="VerticalOptions" Value="Center"/>
                <Setter Property="Margin" Value="10"/>
                <Setter Property="Source" Value="icon"/>
            </Style.Setters>
        </Style>
    </ResourceDictionary>
</ContentPage.Resources>
<StackLayout>
    <Grid BackgroundColor="Silver">
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="60"/>
            <ColumnDefinition Width="*"/>
        </Grid.ColumnDefinitions>
        <Image Grid.Column="0" Grid.Row="0"/>
        <Entry Grid.Column="1" Grid.Row="0"
               x:Name="txtName"
               Placeholder="Name"
               Focused="GrowEntry"
               Unfocused="ShrinkEntry"/>

        <Image Grid.Column="0" Grid.Row="1"/>
        <Entry Grid.Column="1" Grid.Row="1"
               x:Name="txtEmail"
               Placeholder="E-mail"
               BackgroundColor="AliceBlue"
               Focused="GrowEntry"
               Unfocused="ShrinkEntry"/>

        <Image Grid.Column="0" Grid.Row="2"/>
        <Entry Grid.Column="1" Grid.Row="2"
               x:Name="txtPassword"
               Placeholder="Password"
               Focused="GrowEntry"
               Unfocused="ShrinkEntry"/>
    </Grid>
    <BoxView Color="White"
             VerticalOptions="FillAndExpand"/>
</StackLayout>

在后面的代码中，GrowEntry和ShrinkEntry：

private void GrowEntry(object sender, EventArgs args)
{
    var entry = (Entry)sender;

    entry.Margin = new Thickness(6, 12, 12, 12);
}

private void ShrinkEntry(object sender, EventArgs args)
{
    var entry = (Entry)sender;

    entry.Margin = new Thickness(20, 30, 30, 30);
}

你会得到类似的东西：

如何放大活动的输入字段（Xamarin）

3 个答案: