如何解决按钮水平和垂直文本对齐
请帮助我进行VerticalTextAlignment和HorisontalTextAlignment 我使用此网站,但不知道如何添加VerticalTextAlignment
https://forums.xamarin.com/discussion/58774/button-horizontal-text-alignment
这个例子不起作用
How to change Text Alignment of button on Android (Xamarin Forms)?
我使用1个站点,并且可以正常工作,请帮助将VerticalTextAlignment添加到第一个代码中
double num1 = 20.0;
double num2 = 5.0;
if (num1%num2 == 0) {
System.out.println((long) (num1/num2));
} else {
System.out.println(num1/num2);
}
Android
public class ExtendedButton : Xamarin.Forms.Button
{
public static BindableProperty HorizontalTextAlignmentProperty = BindableProperty.Create<ExtendedButton,Xamarin.Forms.TextAlignment>(x => x.HorizontalTextAlignment,Xamarin.Forms.TextAlignment.Center);
public Xamarin.Forms.TextAlignment HorizontalTextAlignment
{
get
{
return (Xamarin.Forms.TextAlignment)GetValue(HorizontalTextAlignmentProperty);
}
set
{
SetValue(HorizontalTextAlignmentProperty,value);
}
}
}
解决方法
您还可以使用这种方法为 ExtendedButton 添加VerticalTextAlignmentProperty
,如下所示:
public class ExtendedButton:Button
{
public static BindableProperty HorizontalTextAlignmentProperty = BindableProperty.Create<ExtendedButton,Xamarin.Forms.TextAlignment>(x => x.HorizontalTextAlignment,Xamarin.Forms.TextAlignment.Center);
public Xamarin.Forms.TextAlignment HorizontalTextAlignment
{
get
{
return (Xamarin.Forms.TextAlignment)GetValue(HorizontalTextAlignmentProperty);
}
set
{
SetValue(HorizontalTextAlignmentProperty,value);
}
}
public static BindableProperty VerticalTextAlignmentProperty = BindableProperty.Create<ExtendedButton,Xamarin.Forms.TextAlignment>(x => x.VerticalTextAlignment,Xamarin.Forms.TextAlignment.Center);
public Xamarin.Forms.TextAlignment VerticalTextAlignment
{
get
{
return (Xamarin.Forms.TextAlignment)GetValue(VerticalTextAlignmentProperty);
}
set
{
SetValue(VerticalTextAlignmentProperty,value);
}
}
}
然后 ExtendedButtonRenderer 修改如下:
[assembly: ExportRenderer(typeof(ExtendedButton),typeof(ExtendedButtonRenderer))]
namespace XamrinTemp.Droid
{
[Obsolete]
public class ExtendedButtonRenderer : ButtonRenderer
{
public new ExtendedButton Element
{
get
{
return (ExtendedButton)base.Element;
}
}
protected override void OnElementChanged(ElementChangedEventArgs<Xamarin.Forms.Button> e)
{
base.OnElementChanged(e);
if (e.NewElement == null)
{
return;
}
SetHorizonalTextAlignment();
SetVerticalTextAlignment();
}
protected override void OnElementPropertyChanged(object sender,PropertyChangedEventArgs e)
{
base.OnElementPropertyChanged(sender,e);
if (e.PropertyName == ExtendedButton.HorizontalTextAlignmentProperty.PropertyName)
{
SetHorizonalTextAlignment();
}
if (e.PropertyName == ExtendedButton.VerticalTextAlignmentProperty.PropertyName)
{
SetVerticalTextAlignment();
}
}
private void SetHorizonalTextAlignment()
{
Control.Gravity = Element.HorizontalTextAlignment.ToHorizontalGravityFlags() | Element.VerticalTextAlignment.ToVerticalGravityFlags();
}
private void SetVerticalTextAlignment()
{
Control.Gravity = Element.VerticalTextAlignment.ToVerticalGravityFlags() | Element.HorizontalTextAlignment.ToHorizontalGravityFlags();
}
}
public static class AlignmentHelper
{
public static GravityFlags ToHorizontalGravityFlags(this Xamarin.Forms.TextAlignment alignment)
{
if (alignment == Xamarin.Forms.TextAlignment.Center)
return GravityFlags.CenterHorizontal;
return alignment == Xamarin.Forms.TextAlignment.End ? GravityFlags.Right : GravityFlags.Left;
}
public static GravityFlags ToVerticalGravityFlags(this Xamarin.Forms.TextAlignment alignment)
{
if (alignment == Xamarin.Forms.TextAlignment.Center)
return GravityFlags.CenterVertical;
return alignment == Xamarin.Forms.TextAlignment.End ? GravityFlags.Top : GravityFlags.Bottom;
}
}
}
现在,如果在 Xaml 中设置属性,如下所示:
<local:ExtendedButton Text="Here is the Text of Extended Button"
WidthRequest="300"
HeightRequest="200"
HorizontalTextAlignment="Start"
VerticalTextAlignment="End"/>
效果将显示:
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