Xamarin Border Radius AppCompat [英] Xamarin Border Radius AppCompat

问题描述

在项目中包含AppCompat时，似乎BorderRadius属性不起作用.

It seems that the BorderRadius attribute is not working when including AppCompat in the project.

我试图在此处中创建这样的自定义渲染，但是没有这样做.工作:

I tried to create a custom render like this discussed here, but it didn't work:

namespace Xamarin.Forms
{
    public class CustomButton : Button  
    {
        public CustomButton():base()
        {   
        }

        protected override void OnParentSet()
        {
            base.OnParentSet();
        }
    }
}

在Android项目中:

In the Android project:

[assembly: ExportRenderer(typeof(CustomButton), typeof(CustomButtonRenderer))]
namespace CalculateurMadelin.Droid.Renderers
{
        public class CustomButtonRenderer : Xamarin.Forms.Platform.Android.AppCompat.ButtonRenderer
    { }
}

推荐答案

您可以在自定义渲染器中加载Android drawable以在AppCompat.Button上定义背景:

You can load an Android drawable in your custom renderer to define the background on your AppCompat.Button:

[assembly: ExportRenderer(typeof(CustomButton), typeof(CustomButtonRenderer))]
namespace AppCompatRender.Droid
{
    public class CustomButtonRenderer : Xamarin.Forms.Platform.Android.AppCompat.ButtonRenderer
    {
        protected override void OnElementChanged(ElementChangedEventArgs<Button> e)
        {
            base.OnElementChanged(e);
            if (e.OldElement == null)
            {
                Control.SetBackgroundResource(Resource.Drawable.CustomButtonBackground);
            }
        }
    }
}

添加一个与您在SetBackgroundResource中使用的名称(即CustomButtonBackground.axml)匹配的新Resources/Drawable，在此方法中，我将矩形的角半径设置为10dp:

Add a new Resources/Drawable that matches the name you are using in your SetBackgroundResource (i.e.. CustomButtonBackground.axml), in this I am setting a corner radius of the rectangle as 10dp:

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
  android:shape="rectangle">
    <corners android:radius="10dp" />
</shape>

这篇关于Xamarin Border Radius AppCompat的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！