ios - 无法创建Xamarin Forms Picker自定义渲染器

Question

嗨，我很容易为Forms Entry控件创建自定义渲染器，但是当我尝试为Picker创建一个渲染器时，出现此错误:

Error CS0115: `Punteam.iOS.PunteamPickerRederer.OnElementChanged(Xamarin.Forms.Platform.iOS.ElementChangedEventArgs<Xamarin.Forms.Picker>)' is marked as an override but no suitable method found to override (CS0115) (Punteam.iOS)

这是我在Forms项目上的代码:

using System;
using Xamarin.Forms;

namespace Punteam
  {
  public class PunteamPicker : Picker
  {
 }
}

在IOS项目上:

using Xamarin.Forms.Platform.iOS;
using Xamarin.Forms;
using Xamarin.Forms.Platform;
using Punteam;
using Punteam.iOS;
using UIKit;
using EventKitUI;

[assembly: ExportRenderer (typeof(PunteamPicker),      typeof(PunteamPickerRederer))]

namespace Punteam.iOS
{

public class PunteamPickerRederer : PunteamPicker
{
    protected override void OnElementChanged     (ElementChangedEventArgs<Picker> e)
{
/* base.OnElementChanged (e);

    this.Control.TextAlignment = MonoTouch.UIKit.UITextAlignment.Center;

    this.Control.TextColor = UIColor.White;

    this.Control.BackgroundColor = UIColor.Clear;
    this.Control.BorderStyle = UITextBorderStyle.RoundedRect;
    this.Layer.BorderWidth = 1.0f;
    this.Layer.CornerRadius = 4.0f;
    this.Layer.MasksToBounds = true;
    this.Layer.BorderColor = UIColor.White.CGColor;*/
   }
 }
}

任何人都知道为什么我会收到此错误？

Answer 1

public class PunteamPickerRederer : PunteamPicker

应该

public class PunteamPickerRederer : PickerRenderer