c# - Xamarin - Customrenderer 出现 2 个错误

Question

因此，我在位于 SalesKicker.Droid 中的 CustomSwitchRenderer 类中遇到了这些错误。以下是错误:

OnElementCHanged(ElementChangedEventArgs e): no suitable method found to override

和

Android.Widget.Switch cannot be used as typ parameter 'TElement' in the genericc type or method ElementChangedEventArgs' There is no implicit referencee conversion from Widget.Switch to Forms.Element

我很困惑，因为这以前有效，但我不知道我在这里做错了什么。这是我的类(class):

public class CustomSwitchRenderer : SwitchRenderer
{
    protected override void OnElementChanged(ElementChangedEventArgs<Switch> e)
    {
        base.OnElementChanged(e);

        if (Control != null)
        {
            Control.TextOn = "AAN";
            Control.TextOff = "UIT";

            Color colorON = Color.Green;
            Color colorOFF = Color.Red;

            Control.SetTextColor(Color.Black);

            StateListDrawable drawable = new StateListDrawable();

            drawable.AddState(new int[] 
                {
                    Android.Resource.Attribute.StateChecked
                }, new ColorDrawable(colorON));
            drawable.AddState(new int[]
                {

                }, new ColorDrawable(colorOFF));

            Control.ThumbDrawable = drawable; 
        }
    }
}

是的，我还添加了这一行:

using Switch = Android.Widget.Switch

当然还有这个:

[assembly:ExportRenderer(typeof(Switch), typeof(CustomSwitchRenderer))]

谁能告诉我我做错了什么？

Answer 1

您需要using Switch = Xamarin.Forms.Switch 而不是using Switch = Android.Widget.Switch