我正在使用xamarin表单并面临布局问题。现在,使用fontsize .. 我有两个标签,其中一个是Micro。我需要另一个得到Micro label / 2的大小作为它的大小...我正在阅读相关布局,但我不知道这是否是最好的方法...有人有任何想法帮我? 这是我的标签:
<StackLayout Spacing="0">
<Label x:Name="menu_lbl_promocoes" Text="0000" FontAttributes="Bold" TextColor="Black" HorizontalOptions="Center" Style="{Binding labelsfont}"/>
<Label x:Name="menu_lbl_disponiveis" Text="Disponíveis" TextColor="Black" HorizontalOptions="Center" FontSize="Small" Style="{Binding labelsfont}"/>
</StackLayout>
</StackLayout> //yeah, there is another stacklayout
<Label Text="Promoções" FontSize="Micro" TextColor="White" HorizontalOptions="Center" Style="{Binding labelsfont}"/>
我需要第二个标签获得第三个标签的半尺寸(具有微尺寸)......
答案 0 :(得分:9)
只需将Label
扩展为具有两个可绑定属性 - FontSizeFactor
和NamedFontSize
- 然后让它们为您计算字体大小:
public class MyLabel : Label
{
public static readonly BindableProperty FontSizeFactorProperty =
BindableProperty.Create(
"FontSizeFactor", typeof(double), typeof(MyLabel),
defaultValue: 1.0, propertyChanged: OnFontSizeFactorChanged);
public double FontSizeFactor
{
get { return (double)GetValue(FontSizeFactorProperty); }
set { SetValue(FontSizeFactorProperty, value); }
}
private static void OnFontSizeFactorChanged(BindableObject bindable, object oldValue, object newValue)
{
((MyLabel)bindable).OnFontSizeChangedImpl();
}
public static readonly BindableProperty NamedFontSizeProperty =
BindableProperty.Create(
"NamedFontSize", typeof(NamedSize), typeof(MyLabel),
defaultValue: NamedSize.Small, propertyChanged: OnNamedFontSizeChanged);
public NamedSize NamedFontSize
{
get { return (NamedSize)GetValue(NamedFontSizeProperty); }
set { SetValue(NamedFontSizeProperty, value); }
}
private static void OnNamedFontSizeChanged(BindableObject bindable, object oldValue, object newValue)
{
((MyLabel)bindable).OnFontSizeChangedImpl();
}
protected virtual void OnFontSizeChangedImpl()
{
if (this.FontSizeFactor != 1)
this.FontSize = (this.FontSizeFactor * Device.GetNamedSize(NamedFontSize, typeof(Label)));
}
}
样本使用:
<Label FontSize="Large" Text="Large Size" />
<local:MyLabel NamedFontSize="Large" FontSizeFactor="0.9" Text="90% Large Size" />
<Label FontSize="Medium" Text="Medium Size" />
<local:MyLabel NamedFontSize="Medium" FontSizeFactor="0.75" Text="75% Medium Size" />
<Label FontSize="Micro" Text="Micro Size" />
<local:MyLabel NamedFontSize="Micro" FontSizeFactor="0.5" Text="50% Micro Size" />
答案 1 :(得分:2)