UIKitView在打开相机后冻结问题临时处理方案

• flutter 1.20.2 版本iOS WKWebView 和 UIImagePickerController 冲突临时解决方案,目前最新的版本1.22.2已经修复了,项目改动小的可以直接升级
• github issue地址: https://github.com/flutter/flutter/issues/65361

frozen image

• 异常情况的视图层级,对比发现开启相机后,再进入UIKitView页面会新增FlutterClippingMaskView,遮罩层
• 正常情况的视图层级

Related views

1. FlutterTouchInterceptingView // A UIView that is used as the parent for embedded UIViews.
//
// This view has 2 roles:
// 1. Delay or prevent touch events from arriving the embedded view.
// 2. Dispatching all events that are hittested to the embedded view to

2. FlutterView

   • bind engine delegate and create surface

3. ChildClippingView

   • filter touch events

4. FlutterClippingMaskView

   • chip the bottom views, (bloc the platform view touch events)

Temp solution

• 如果时再UIKitView所在的页面则不会出现这个问题，临时解决方案
• remove FlutterClippingMaskView on webview loaded

    func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {
        let lastView = webView.superview?.superview?.subviews.last
        if lastView?.description.contains("FlutterClippingMaskView") ?? false {
            lastView?.isUserInteractionEnabled = true;
            lastView?.removeFromSuperview();
        }
        print(#function,#line)
    }

• disable the edge gestures for navigation

  body: WillPopScope(child: UiKitView(
        viewType: VIEW_TYPE,
        hitTestBehavior: PlatformViewHitTestBehavior.opaque,
        creationParams: {'url': 'https://www.baidu.com'},
        onPlatformViewCreated: (viewId) {
          channel = MethodChannel('${VIEW_TYPE}_$viewId');
        },
        creationParamsCodec: StandardMessageCodec(),
      ), onWillPop: () async {
        if (Navigator.of(context).userGestureInProgress) {
          return false;
        } else {
          return true;
        }
      },
      ),