目前的XF还是非常简陋的，所以存在大量的自定义工作。一般情况下我们只是要需要派生原生的XF控件，然后在各平台下修改其呈现方法。
所以了解每个XF控件在不同平台上呈现使用的控件类是有所必须要的。以下别人整理的一个参考，很不错。
对于XF 命名空间下的 Button类，该类定义使用按钮的这个界面元素所需要的内容 可以设置的属性（颜色，背景色），能支持的事件等等
当然Button在平台（ios android WP）上最终呈现的样式，是否真的支持设置背景色，是否真的支持某些事件 都是有平台命名空间下各个Render决定的
iOS: Xamarin.Forms.Platform.iOS
Android: Xamarin.Forms.Platform.Android
Windows Phone: Xamarin.Forms.Platform.WinPhone
每个类库下都有一个ButtonRender 类
以下是Android Button Render类的部分代码
public class ButtonRenderer : ViewRenderer<Button, Button>, View.IOnAttachStateChangeListener, IJavaObject, IDisposable
{
//
protected override void OnElementChanged (ElementChangedEventArgs<Button> e)
{
base.OnElementChanged (e);
if (base.Control == null) {
Button button = new Button (base.Context);
button.SetOnClickListener (ButtonRenderer.ButtonClickListener.Instance.get_Value ());
button.Tag = this;
this.buttonDefaulTextColors = button.TextColors;
base.SetNativeControl (button);
button.AddOnAttachStateChangeListener (this);
}
this.UpdateAll ();
}
我们可以从中可以看出端倪，ButtonRender 继承ViewRenderer<Xamarin.Forms.Button, Android.Widget.Button>，两个范型参数 第一个是XF类，第二个在平台上真实的控件类，Button Render 的OnElementChanged 方法实现了具体的显示逻辑。
如何具体实现自定义Render的操作可以参见http://developer.xamarin.com/guides/cross-platform/xamarin-forms/custom-renderer/
-----------
This guide was update using Xamarin.Forms version 1.1.0.6201, which is the latest version at the time of this page's last edit.
Platform Specific renderers can be found in the following namespaces:
iOS: Xamarin.Forms.Platform.iOS
Android: Xamarin.Forms.Platform.Android
Windows Phone: Xamarin.Forms.Platform.WinPhone
With the 6201 release many of the inconsistencies in the controls have been address but some still exist. Sometimes the Windows Phone renderers were creating the native controls by loading an Xaml file or pulling the native control out of Application.CurrentResources. In these cases I was not able to tell exactly what native controls were being created.
Base Renderer
To start with, all renders usually derive from a platform specific base renderer class that in turn inherit from a platform specific control. If you want to create platform specific renderers from scratch you are probably going to be deriving them from the correct platform's base renderer class. These have been substantially standardized in version 6201 with all controls inheriting from a generic version of ViewRenderer. There is also a non-generic version that appears to be used sometimes by navigation controls. The methods on these classes are also more in line with each other than they had been but still not the same. For example the iOS version has a method called ViewOnUnfocusRequested while the Android's version of the same method is called OnUnfocusRequested.
iOS:
Renderer: Xamarin.Forms.Platform.iOS.ViewRenderer<TView, TNavitveView>
Platform Specific Control: types deriving from MonoTouch.UIKit.UIView
Android
Renderer: Xamarin.Forms.Platform.Android.ViewRenderer<TView, TNavitveView>
Platform Specific Control: types deriving from Android.Views.ViewGroup
Windows Phone
Renderer: Xamarin.Forms.Platform.WinPhone.ViewRenderer<TModel, TElement>
Platform Specific Control: types deriving from System.Windows.FrameworkElement
Layout Renderers
ContentPage
iOS
Renderer: Xamarin.Forms.Platform.iOS.PageRenderer
Platform Specific Control: MonoTouch.UIKit.UIView
Android
Renderer: Xamarin.Forms.Platform.Android.PageRenderer
Platform Specific Control: Android.Views.ViewGroup
Windows Phone
Renderer: Xamarin.Forms.Platform.WinPhone.PageRenderer
Platform Specific Control: System.Windows.Controls.Panel
MasterDetailPage
iOS
Renderer: Xamarin.Forms.Platform.iOS.PhoneMasterDetailRenderer for iPhone and Xamarin.Forms.Platform.iOS.TabletMasterDetailRenderer for iPad
Platform Specific Control: custom flyout on iPhone and MonoTouch.UIKit.UISplitViewController for iPad
Android
Renderer: Xamarin.Forms.Platform.Android.MasterDetailRenderer
Platform Specific Control: Android.Support.V4.Widget.DrawerLayout
Windows Phone
Renderer: Xamarin.Forms.Platform.WinPhone.MasterDetailRenderer
Platform Specific Control: System.Windows.Controls.Panel
NavigationPage
iOS
Renderer: Xamarin.Forms.Platform.iOS.NavigationRenderer
Platform Specific Control: MonoTouch.UIKit.UIToolbar and derives from MonoTouch.UIKit.UINavigationController
Android
Renderer: Xamarin.Forms.Platform.Android.NavigationRenderer
Platform Specific Control: No View of its own, deals with switching content derived from Android.Views.View
Windows Phone
Renderer: Xamarin.Forms.Platform.WinPhone.NavigationPageRenderer
Platform Specific Control: No View of its own, deals with switching content derived from System.Windows.FrameworkElements
TabbedPage
iOS
Renderer: Xamarin.Forms.Platform.iOS.TabbedRenderer
Platform Specific Control: MonoTouch.UIKit.UIViewController with contained MonoTouch.UIKit.UIView
Android
Renderer: Xamarin.Forms.Platform.Android.TabbedRenderer
Platform Specific Control: No View of its own, deals with switching content derived from Android.Views.View
Windows Phone
Renderer: Xamarin.Forms.Platform.WinPhone.TabbedPageRenderer
Platform Specific Control: inherits from Microsoft.Phone.Controls.Pivot
CarouselPage
iOS
Renderer: Xamarin.Forms.Platform.iOS.CarouselPageRenderer
Platform Specific Control: MonoTouch.UIKit.UIScrollView
Android
Renderer: Xamarin.Forms.Platform.Android.CarouselPageRenderer
Platform Specific Control: Android.Views.View
Windows Phone
Renderer: Xamarin.Forms.Platform.WinPhone.CarouselPageRenderer
Platform Specific Control: Microsoft.Phone.Controls.PanoramaItem
Frame
iOS
Renderer: Xamarin.Forms.Platform.iOS.FrameRenderer
Platform Specific Control: MonoTouch.UIKit.UIView
Android
Renderer: Xamarin.Forms.Platform.Android.FrameRenderer
Platform Specific Control: Android.Graphics.Drawables.Drawable
Windows Phone
Renderer: Xamarin.Forms.Platform.WinPhone.FrameRenderer
Platform Specific Control: System.Windows.UIElement
ScrollView
iOS
Renderer: Xamarin.Forms.Platform.iOS.ScrollViewRenderer
Platform Specific Control: MonoTouch.UIKit.UIScrollView
Android
Renderer: Xamarin.Forms.Platform.Android.ScrollViewRenderer
Platform Specific Control: Android.Widget.ScrollView
Windows Phone
Renderer: Xamarin.Forms.Platform.WinPhone.ScrollViewRenderer
Platform Specific Control: System.Windows.Controls.ScrollViewer
AbsoluteLayout
iOS
Renderer: Unsure
Platform Specific Control: Unsure
Android
Renderer: Unsure
Platform Specific Control: Unsure
Windows Phone
Renderer: Unsure
Platform Specific Control: Unsure
Grid
iOS
Renderer: Unsure
Platform Specific Control: Unsure
Android
Renderer: Unsure
Platform Specific Control: Unsure
Windows Phone
Renderer: Unsure
Platform Specific Control: Unsure
RelativeLayout
iOS
Renderer: Unsure
Platform Specific Control: Unsure
Android
Renderer: Unsure
Platform Specific Control: Unsure
Windows Phone
Renderer: Unsure
Platform Specific Control: Unsure
StackLayout
iOS
Renderer: Unsure
Platform Specific Control: Unsure
Android
Renderer: Unsure
Platform Specific Control: Unsure
Windows Phone
Renderer:
Platform Specific Control: Unsure
TableView
iOS
Renderer: Xamarin.Forms.Platform.iOS.TableViewRenderer
Platform Specific Control: MonoTouch.UIKit.UITableView
Android
Renderer: Xamarin.Forms.Platform.Android.TableViewRenderer (Table), Xamarin.Forms.Platform.Android.TableViewModelRenderer (Rows)
Platform Specific Control: Android.Widget.ListView (Table), Android.Views.View (Row)
Windows Phone
Renderer: Xamarin.Forms.Platform.WinPhone.TableViewRenderer
Platform Specific Control: Microsoft.Phone.Controls.LongListSelector
Control Renderers
ActivityIndicator
iOS
Renderer: Xamarin.Forms.Platform.iOS.ActivityIndicatorRenderer
Platform Specific Control: MonoTouch.UIKit.UIActivityIndicatorView
Android
Renderer: Xamarin.Forms.Platform.Android.ActivityIndicatorRenderer
Platform Specific Control: Android.Widget.ProgressBar
Windows Phone
Renderer: Xamarin.Forms.Platform.WinPhone.ActivityIndicatorRenderer
Platform Specific Control: System.Windows.Controls.ProgressBar
BoxView
iOS
Renderer: Xamarin.Forms.Platform.iOS.BoxRenderer
Platform Specific Control: MonoTouch.CoreGrahics.CGContext
Android
Renderer: Xamarin.Forms.Platform.Android.BoxRenderer
Platform Specific Control: Android.Views.ViewGroup
Windows Phone
Renderer: Xamarin.Forms.Platform.WinPhone.BoxViewRenderer
Platform Specific Control: System.Windows.Shapes.Rectangle
Button
iOS
Renderer: Xamarin.Forms.Platform.iOS.ButtonRenderer
Platform Specific Control: MonoTouch.UIKit.UIButton
Android
Renderer: Xamarin.Forms.Platform.Android.ButtonRenderer
Platform Specific Control: Android.Widget.Button
Windows Phone
Renderer: Xamarin.Forms.Platform.WinPhone.ButtonRenderer
Platform Specific Control: System.Windows.Controls.Button
DatePicker
iOS
Renderer: Xamarin.Forms.Platform.iOS.DatePickerRenderer
Platform Specific Control: MonoTouch.UIKit.UIToolbar with MonoTouch.UIKit.UIBarButtonItems
Android
Renderer: Xamarin.Forms.Platform.Android.DatePickerRenderer
Platform Specific Control: Android.App.DatePickerDialog
Windows Phone
Renderer: Xamarin.Forms.Platform.WinPhone.DatePickerRenderer
Platform Specific Control: Microsoft.Phone.Controls.DateTimePickerBase
Editor
iOS
Renderer: Xamarin.Forms.Platform.iOS.EditorRenderer
Platform Specific Control: MonoTouch.UIKit.UITextView
Android
Renderer: Xamarin.Forms.Platform.Android.EditorRenderer
Platform Specific Control: Android.Widget.EditText
Windows Phone
Renderer: Xamarin.Forms.Platform.WinPhone.EditorRenderer
Platform Specific Control: System.Windows.Controls.TextBox
Entry
iOS
Renderer: Xamarin.Forms.Platform.iOS.EntryRenderer
Platform Specific Control: MonoTouch.UIKit.UITextField
Android
Renderer: Xamarin.Forms.Platform.Android.EntryRenderer
Platform Specific Control: Android.Widget.EditText
Windows Phone
Renderer: Xamarin.Forms.Platform.WinPhone.EntryRenderer
Platform Specific Control: Microsoft.Phone.Controls.PhoneTextBox or System.Windows.Controls.PasswordBox
Image
iOS
Renderer: Xamarin.Forms.Platform.iOS.ImageRenderer
Platform Specific Control: MonoTouch.UIKit.UIImageView
Android
Renderer: Xamarin.Forms.Platform.Android.ImageRenderer
Platform Specific Control: Android.Widget.ImageView
Windows Phone
Renderer: Xamarin.Forms.Platform.WinPhone.ImageRenderer
Platform Specific Control: System.Windows.Controls.Image
Label
iOS
Renderer: Xamarin.Forms.Platform.iOS.LabelRenderer
Platform Specific Control: MonoTouch.UIKit.UILabel
Android
Renderer: Xamarin.Forms.Platform.Android.LabelRenderer
Platform Specific Control: Android.Widget.TextView
Windows Phone
Renderer: Xamarin.Forms.Platform.WinPhone.LabelRenderer
Platform Specific Control: System.Windows.Controls.TextBlock
ListView
iOS
Renderer: Xamarin.Forms.Platform.iOS.ListViewRenderer
Platform Specific Control: MonoTouch.UIKit.UITableView
Android
Renderer: Xamarin.Forms.Platform.Android.ListViewRenderer (currently internal in scope and not derivable)
Platform Specific Control: Android.Widget.ListView
Windows Phone
Renderer: Xamarin.Forms.Platform.WinPhone.ListViewRenderer
Platform Specific Control: Microsoft.Phone.Controls.LongListSelector
OpenGLView
iOS
Renderer: Xamarin.Forms.Platform.iOS.OpenGLViewRenderer
Platform Specific Control: MonoTouch.GLKit.GLKView
Android
Renderer: Xamarin.Forms.Platform.Android.OpenGLRenderer (currently internal in scope and not derivable)
Platform Specific Control: Android.Opengl.GLSurfaceView
Windows Phone
Renderer: Unsure
Platform Specific Control: Unsure
Picker
iOS
Renderer: Xamarin.Forms.Platform.iOS.PickerRenderer
Platform Specific Control: MonoTouch.UIKit.UIPickerView, MonoTouch.UIKit.UIPickerViewModel, MonoTouch.UIKit.UIToolBar, Two MonoTouch.UIKit.UIBarButtonItems, MonoTouch.UIKit.UITextField
Android
Renderer: Xamarin.Forms.Platform.Android.PickerRenderer
Platform Specific Control: Android.Widget.TextView, Android.App.AlertDialog and Android.Widget.NumberPicker
Windows Phone
Renderer: Xamarin.Forms.Platform.WinPhone.PickerRenderer
Platform Specific Control: Microsoft.Phone.Controls.ListPicker
ProgressBar
iOS
Renderer: Xamarin.Forms.Platform.iOS.ProgressBarRenderer
Platform Specific Control: MonoTouch.UIKit.UIProgressView
Android
Renderer: Xamarin.Forms.Platform.Android.ProgressBarRenderer
Platform Specific Control: Android.Widget.ProgressBar
Windows Phone
Renderer: Xamarin.Forms.Platform.WinPhone.ProgressBarRenderer
Platform Specific Control: System.Windows.Controls.ProgressBar
SearchBar
iOS
Renderer: Xamarin.Forms.Platform.iOS.SearchBarRenderer
Platform Specific Control: MonoTouch.UIKit.UISearchBar
Android
Renderer: Xamarin.Forms.Platform.Android.SearchBarRenderer
Platform Specific Control: Android.Widget.SearchView
Windows Phone
Renderer: Xamarin.Forms.Platform.WinPhone.SearchBarRenderer
Platform Specific Control: Microsoft.Phone.Controls.PhoneTextBox
Slider
iOS
Renderer: Xamarin.Forms.Platform.iOS.SliderRenderer
Platform Specific Control: MonoTouch.UIKit.UISlider
Android
Renderer: Xamarin.Forms.Platform.Android.SliderRenderer
Platform Specific Control: Android.Widget.SeekBar
Windows Phone
Renderer: Xamarin.Forms.Platform.WinPhone.SliderRenderer
Platform Specific Control: System.Windows.Controls.Slider
Stepper
iOS
Renderer: Xamarin.Forms.Platform.iOS.StepperRenderer
Platform Specific Control: MonoTouch.UIKit.UIStepper
Android
Renderer: Xamarin.Forms.Platform.Android.StepperRenderer
Platform Specific Control: Android.Widget.LinearLayout with four Android.Widget.Buttons
Windows Phone
Renderer: Xamarin.Forms.Platform.WinPhone.StepperRenderer
Platform Specific Control: System.Windows.Controls.Border with four System.Windows.Controls.Buttons
Switch
iOS
Renderer: Xamarin.Forms.Platform.iOS.SwitchRenderer
Platform Specific Control: MonoTouch.UIKit.UISwitch
Android
Renderer: Xamarin.Forms.Platform.Android.SwitchRenderer
Platform Specific Control: Android.Widget.Switch
Windows Phone
Renderer: Xamarin.Forms.Platform.WinPhone.SwitchRenderer
Platform Specific Control: System.Windows.Controls.Primitives.ToggleButton
TimePicker
iOS
Renderer: Xamarin.Forms.Platform.iOS.TimePickerRenderer
Platform Specific Control: MonoTouch.UIKit.UIDatePicker, MonoTouch.UIKit.UITextField, MonoTouch.UIKit.UIToolbar, MonoTouch.UIKit.UIBarButtonItems
Android
Renderer: Xamarin.Forms.Platform.Android.TimePickerRenderer
Platform Specific Control: Two Android.Widget.TextViews and a Android.App.AlertDialog
Windows Phone
Renderer: Xamarin.Forms.Platform.WinPhone.TimePickerRenderer
Platform Specific Control: Microsoft.Phone.Controls.DateTimePickerBase
WebView
iOS
Renderer: Xamarin.Forms.Platform.iOS.WebViewRenderer
Platform Specific Control: MonoTouch.UIKit.UIWebView
Android
Renderer: Xamarin.Forms.Platform.Android.WebRenderer
Platform Specific Control: Android.Webkit.WebView
Windows Phone
Renderer: Xamarin.Forms.Platform.WinPhone.WebViewRenderer
Platform Specific Control: Microsoft.Phone.Controls.WebBrowser
Cell Controls
EntryCell
iOS
Renderer: Xamarin.Forms.Platform.iOS.EntryCellRenderer
Platform Specific Control: MonoTouch.UIKit.UITableViewCell with a MonoTouch.UIKit.UITextField
Android
Renderer: Xamarin.Forms.Platform.Android.EntryCellRenderer
Platform Specific Control: Android.Widget.LinearLayout contianing Android.Widget.TextView and Android.Widget.EditText
Windows Phone
Renderer: Xamarin.Forms.Platform.WinPhone.EntryCellRenderer
Platform Specific Control: Pulls from Application.Current.Resources for name "EntryCell" of type System.Windows.DataTemplate
SwitchCell
iOS
Renderer: Xamarin.Forms.Platform.iOS.SwitchCellRenderer
Platform Specific Control: MonoTouch.UIKit.UITableViewCell with a MonoTouch.UIKit.UISwitch
Android
Renderer: Xamarin.Forms.Platform.Android.SwitchCellRenderer
Platform Specific Control: Android.Widget.Switch
Windows Phone
Renderer: Xamarin.Forms.Platform.WinPhone.SwitchCellRenderer
Platform Specific Control: Pulls from Application.Current.Resources for name "SwitchCell" of type System.Windows.DataTemplate
TextCell
iOS
Renderer: Xamarin.Forms.Platform.iOS.TextCellRenderer
Platform Specific Control: MonoTouch.UIKit.UITableViewCel
Android
Renderer: Xamarin.Forms.Platform.Android.TextCellRenderer
Platform Specific Control: Android.Widget.LinearLayout contianing two Android.Widget.TextViews and Android.Widget.ImageView
Windows Phone
Renderer: Xamarin.Forms.Platform.WinPhone.TextCellRenderer
Platform Specific Control: Pulls from Application.Current.Resources for name "TextCell", or "ListViewHeaderTextCell" or "ListViewTextCell" of type System.Windows.DataTemplate depending on parent/context of the cell.
ImageCell
iOS
Renderer: Xamarin.Forms.Platform.iOS.ImageCellRenderer
Platform Specific Control: MonoTouch.UIKit.UITableViewCell with a MonoTouch.UIKit.UIImage
Android
Renderer: Xamarin.Forms.Platform.Android.ImageCellRenderer
Platform Specific Control: Android.Widget.LinearLayout contianing two Android.Widget.TextViews and Android.Widget.ImageView
Windows Phone
Renderer: Xamarin.Forms.Platform.WinPhone.ImageCellRenderer
Platform Specific Control: Pulls from Application.Current.Resources for name "ListImageCell", or "ImageCell" of type System.Windows.DataTemplate depending on parent/context of the cell.
I hope this helps people trying to understand what these renderers are creating on the native platforms and gives a hint at how they can be extended.
- See more at: http://magenic.com/Blog/PostId/31/xamarin-xamarinforms-renderer-reference#sthash.gfQllYrJ.dpuf
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