[英]iOS app freeze for ~0.5 second on swipe back gesture
我正在使用 Flutter 來開發我們的移動應用程序。 當我像這樣打開新屏幕時:
Navigator.push(
context,
MaterialPageRoute/CupertinoPageRoute(
builder: (context) => NewScreen(....),
));
我使用滑動手勢向后滑動,用戶界面在 0.5 - 1 秒后不可點擊。 它使應用程序感覺反應遲鈍和緩慢。 是什么導致了這種“凍結”? 有什么東西在吃觸摸事件嗎?
我嘗試使用@edwardez 提供的示例代碼調查此問題,發現這是由於...
文件:routes.dart Class:_ModalScopeState Function:構建(...)行:
AnimatedBuilder(
// !!!!!!!!!!!!!!!!!!!!!!!!! userGestureInProgressNotifier becomes true
animation: widget.route.navigator?.userGestureInProgressNotifier ?? ValueNotifier<bool>(false),
builder: (BuildContext context, Widget child) {
final bool ignoreEvents = _shouldIgnoreFocusRequest;
focusScopeNode.canRequestFocus = !ignoreEvents;
return IgnorePointer(
ignoring: false,//ignoreEvents, // <<<<<<<<<<<<<< Tried setting it to FALSE, resolves the issue.
child: child,
);
},
child: child,
),
將IgnorePointer
的ignoring
屬性設置為 false 會保留第一個屏幕的 animation 並解決問題。
當我嘗試將userGestureInProgressNotifier
設置為始終返回 false 並恢復我在 IgnorePointer 中的更改時...
文件:navigator.dart Function:設置_userGesturesInProgress 行:
set _userGesturesInProgress(int value) {
_userGesturesInProgressCount = value;
//userGestureInProgressNotifier.value = _userGesturesInProgress > 0; // <<<<<< Commented
}
這也解決了問題,但第一個屏幕沒有 animation。 (與在 AppBar 中按下后退按鈕相同)。
我的Flutter博士...
[✓] Flutter (Channel stable, 1.22.5, on macOS 11.1 20C69 darwin-x64, locale en-US)
• Flutter version 1.22.5 at /Users/rickkystiannelim/Documents/sdk/flutter
• Framework revision 7891006299 (5 weeks ago), 2020-12-10 11:54:40 -0800
• Engine revision ae90085a84
• Dart version 2.10.4
[✓] Android toolchain - develop for Android devices (Android SDK version 30.0.2)
• Android SDK at /Users/rickkystiannelim/Library/Android/sdk
• Platform android-30, build-tools 30.0.2
• Java binary at: /Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/bin/java
• Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b3-6915495)
• All Android licenses accepted.
[✓] Xcode - develop for iOS and macOS (Xcode 12.2)
• Xcode at /Applications/Xcode.app/Contents/Developer
• Xcode 12.2, Build version 12B45b
• CocoaPods version 1.9.3
[!] Android Studio (version 4.1)
• Android Studio at /Applications/Android Studio.app/Contents
✗ Flutter plugin not installed; this adds Flutter specific functionality.
✗ Dart plugin not installed; this adds Dart specific functionality.
• Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b3-6915495)
[✓] VS Code (version 1.52.1) // <<<<<<<<<<<<<< IDE used
• VS Code at /Applications/Visual Studio Code.app/Contents
• Flutter extension version 3.18.1
[✓] Connected device (1 available)
• ASUS Z012DA (mobile) • G8AZCY00Z1714K5 • android-arm64 • Android 8.0.0 (API 26) // <<<<<< Device used
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