LifecycleDispatcher class

生命周期分发核心实现类

  • 继承 StateDelegate 接口，监听 State 对应的生命中周期 * widget 生命周期 initState：在整个生命周期中的初始化阶段调用，只会调用一次 didChangeDependencies：当 State 对象依赖发生变动时调用 didUpdateWidget：当 Widget 状态发生改变时调用；实际上每次更新状态时，Flutter 会创建一个新的 Widget，并在该函数中进行新旧 Widget 对比；一般调用该方法之后会调用 build reassemble：只有在 debug 或 热重载 时调用 deactivate：从 Widget Tree 中移除 State 对象时会调用，一般用在 dispose 之前 dispose：用于 Widget 被销毁时，通常会在此方法中移除监听或清理数据等，整个生命周期只会执行一次

  • 混入 LifecycleOwner 提供 lifecycle 实现接口 *

  • 混入 WidgetsBindingObserver 监听 App 生命周期改变，前后台切换监听 * AppLifecycleState resumed：应用程序可见且获取焦点状态，回到用户视野 inactive：应用程序处于非活动状态，可见但是不可交互的状态 paused：应用程序处于用户不可见，不响应用户状态，处于后台运行状态

  • 混入 RouteAware 监听页面 进栈/出栈 相关的监听 * RouteAware didPopNext()：调用时期：顶部路由弹出，当前路由显示 didPushNext()：调用时期：新的路由添加入栈，当前路由不再可见

Inheritance
Mixed in types

Constructors

LifecycleDispatcher(LifecycleOwner _owner, State<StatefulWidget> _state)

Properties

hashCode → int
The hash code for this object.
no setterinherited
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited

Methods

deactivate() → void
从 Widget Tree 中移除 State 对象时会调用，一般用在 dispose 之前
override
didChangeAccessibilityFeatures() → void
Called when the system changes the set of currently active accessibility features.
inherited
didChangeAppLifecycleState(AppLifecycleState state) → void
函数回调时机：1.正常切换前台/后台 2.系统级别弹窗&activity / 自定义开启弹窗&activity 1.正常切换前后台 1.1 切到后台：inactive > paused 1.2 切回前台：resumed 2.系统级别弹窗&activity / 自定义开启弹窗&activity 2.1 非全屏：展示：inactive 消失：resumed 2.1 全屏：展示：inactive > paused 消失：resumed
override
didChangeDependencies() → void
初始化完成之后调用，BuildContext上下文可用时期
override
didChangeLocales(List<Locale>? locales) → void
Called when the system tells the app that the user's locale has changed. For example, if the user changes the system language settings.
inherited
didChangeMetrics() → void
Called when the application's dimensions change. For example, when a phone is rotated.
inherited
didChangePlatformBrightness() → void
Called when the platform brightness changes.
inherited
didChangeTextScaleFactor() → void
Called when the platform's text scale factor changes.
inherited
didHaveMemoryPressure() → void
Called when the system is running low on memory.
inherited
didPop() → void
Called when the current route has been popped off.
inherited
didPopNext() → void
调用时期：顶部路由弹出，当前路由显示
override
didPopRoute() → Future<bool>
Called when the system tells the app to pop the current route, such as after a system back button press or back gesture.
inherited
didPush() → void
Called when the current route has been pushed.
inherited
didPushNext() → void
调用时期：新的路由添加入栈，当前路由不再可见
override
didPushRoute(String route) → Future<bool>
Called when the host tells the application to push a new route onto the navigator.
inherited
didPushRouteInformation(RouteInformation routeInformation) → Future<bool>
Called when the host tells the application to push a new RouteInformation and a restoration state onto the router.
inherited
didRequestAppExit() → Future<AppExitResponse>
Called when a request is received from the system to exit the application.
inherited
dispose() → void
Widget 被销毁时，通常会在此方法中移除监听或清理数据等，整个生命周期只会执行一次
override
getLifecycle() → LifecycleObservable
Lifecycle被观察者
override
getStateful() → State<StatefulWidget>
Lifecycle stateful对象
override
handleCancelBackGesture() → void
Called when a predictive back gesture is canceled, indicating that no navigation should occur.
inherited
handleCommitBackGesture() → void
Called when a predictive back gesture is finished successfully, indicating that the current route should be popped.
inherited
handleStartBackGesture(PredictiveBackEvent backEvent) → bool
Called at the start of a predictive back gesture.
inherited
handleUpdateBackGestureProgress(PredictiveBackEvent backEvent) → void
Called when a predictive back gesture moves.
inherited
initState() → void
初始化状态，只执行一次，BuildContext 不可用 类似于 Android 的 onCreate ，iOS 的 viewDidLoad 备注：此时view并没有渲染，statefulWidget 已经被加载到渲染树中
override
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
toString() → String
A string representation of this object.
inherited

Operators

operator ==(Object other) → bool
The equality operator.
inherited