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由 Dan Field 提交于
* Create FlutterEngine to manage a Shell to support maintaining execution state across instances of FlutterViewControllers * Refactor PlatformViewIOS to support adding or removing a FlutterViewController dynamically * Refactor FlutterDartHeadlessCodeRunner to implement FlutterEngine * Refactor FlutterViewController to accept a FlutterEngine at initialization or to create one for backwards compatibility; any Shell related responsibilities are now passed through to the Engine instance * Remove FlutterNavigationController (unused) * Update all public Objective C doc comments to be consistent and formatable * Add public documentation to all public headers
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