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由 Amir Hardon 提交于
Adds a FlutterPlatformViewFactory protocol - a simple factory protocol to be implemented by plugins that exposes a UIView for embedding in Flutter apps. * Adds a FlutterPlatformView protocol, which is used to associate a dispose callback with a `UIView` created by a FlutterPlatformViewFactory. * Exposes a registerViewFactory method in FlutterPluginRegistrar. * Implements the `flutter/platform_views` system channel on iOS, allowing Dart code to ask for creation/destruction of UIViews.
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