[xamarin]CustomRenderers

파일구조

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"             
             xmlns:local="clr-namespace:App8CustomRenderers;assembly=App8CustomRenderers"
             x:Class="App8CustomRenderers.MainPage">
 
    <StackLayout VerticalOptions="CenterAndExpand" 
                              HorizontalOptions="CenterAndExpand">
        <Label Text="Hello, Custom Renderer!" />
        <local:MyEntry Text="In Shared Code" />
    </StackLayout>
 
</ContentPage>
 

Forms에 커스텀 할 Entry 적어줌

using System;
using System.Collections.Generic;
using System.Text;
using Xamarin.Forms;
 
namespace App8CustomRenderers
{
    public class MyEntry : Entry
    {
    }
}
 

IOS 

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using App8CustomRenderers;
using App8CustomRenderers.iOS;
using Foundation;
using UIKit;
using Xamarin.Forms;
using Xamarin.Forms.Platform.iOS;
 
[assembly: ExportRenderer(typeof(MyEntry), typeof(MyEntryRenderer))]
namespace App8CustomRenderers.iOS
{
    public class MyEntryRenderer : EntryRenderer
    {
        protected override void OnElementChanged(ElementChangedEventArgs<Entry> e)
        {
            base.OnElementChanged(e);
 
            if (Control != null)
            {
                // do whatever you want to the UITextField here!
                Control.BackgroundColor = UIColor.FromRGB(204, 153, 255);
                Control.BorderStyle = UITextBorderStyle.Line;
            }
        }
    }
}

안드로이드

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
 
using Android.App;
using Android.Content;
using Android.OS;
using Android.Runtime;
using Android.Views;
using Android.Widget;
using App8CustomRenderers;
using App8CustomRenderers.Droid;
using Xamarin.Forms;
using Xamarin.Forms.Platform.Android;
 
[assembly: ExportRenderer(typeof(MyEntry), typeof(MyEntryRenderer))]
namespace App8CustomRenderers.Droid
{
    class MyEntryRenderer : EntryRenderer
    {
        public MyEntryRenderer(Context context) : base(context)
        {
        }
 
        protected override void OnElementChanged(ElementChangedEventArgs<Entry> e)
        {
            base.OnElementChanged(e);
 
            if (Control != null)
            {
                Control.SetBackgroundColor(global::Android.Graphics.Color.LightGreen);
            }
        }
    }
}

각각 플랫폼에 ExportRenderer를 이용하서 각 플렛폼에 해당하는 프로젝트들이 동작한다.

실행

따라한 소스는 https://developer.xamarin.com/samples/xamarin-forms/CustomRenderers/Entry/