如何查找Xamarin.Forms.Platform.Android/iOS.ViewRenderer的完整API文档？

I get exactly where you're coming from—Microsoft's official docs focus heavily on how to build custom renderers but skimp on the full API specs for these foundational platform-specific renderer classes, which is super frustrating when you want to understand all available methods, events, and properties before diving in.

Here are a few reliable ways to access this detailed API info without digging through GitHub source code:

1. Use the .NET API Browser or Visual Studio's Object Browser #

While the main Xamarin.Forms docs don't surface these classes, the .NET API Browser includes their full definitions. You can search directly for Xamarin.Forms.Platform.Android.ViewRenderer or Xamarin.Forms.Platform.iOS.ViewRenderer to see every inherited and native member, including method signatures, event triggers, and property details.

For offline access, fire up Visual Studio's Object Browser (via View > Object Browser). Type the class name into the search bar, and you'll get a structured view of all members, complete with access modifiers, parameter lists, and return types—perfect for exploring what's available.

2. Leverage IDE Go-to-Definition #

Create a quick test custom renderer in your project, like this:

// For Android
using Xamarin.Forms.Platform.Android;

public class TestRenderer : ViewRenderer<Label, Android.Widget.TextView>
{
}

Right-click on ViewRenderer and select Go to Definition. Your IDE will generate a readable, metadata-based view of the class's full structure—this isn't the raw GitHub source, but it includes every method, event, and property you need to know about (like OnElementChanged, OnElementPropertyChanged, Control, and Element).

3. Check NuGet Package XML Comments #

Every Xamarin.Forms NuGet package comes with XML comment files that mirror official API docs. Navigate to your local NuGet cache (usually %userprofile%\.nuget\packages\xamarin.forms on Windows or ~/.nuget/packages/xamarin.forms on macOS), find the version you're using, and look in the platform-specific folders (lib\MonoAndroid10.0 for Android, lib\Xamarin.iOS10 for iOS). The corresponding .xml file next to the platform DLL has detailed comments for all ViewRenderer members.

All these methods let you get the full API specs you need without sifting through source code.

内容的提问来源于stack exchange，提问作者ibocon