///动画构建器 构建指定动画类型 transitionBuilder: (Widget child, Animation<double> animation) { //执行缩放动画 return ScaleTransition(child: child, scale: animation); }, ///执行动画的子 Widget ///只有子 Widget 被切换时才会触发动画 child: Text( '$_count', //显示指定key,不同的key会被认为...
和普通的Switcher用法一样,AnimatedSwitcher也可以切换不同的小部件,但是在AnimatedSwitcher中,这些小部件之间会有一些动画效果,比如淡入淡出效果或者滑动效果等等。你只需要在切换小部件的时候添加一个AnimationController,并且将小部件包裹在一个AnimatedSwitcher小部件之中即可实现动画效果。因此,AnimatedSwitcher是一个方便实现小...
究竟执行何种动画效果则由transitionBuilder参数决定,该参数接受一个AnimatedSwitcherTransitionBuilder类型的 builder,定义如下: typedefAnimatedSwitcherTransitionBuilder=WidgetFunction(Widget child,Animation<double>animation); 该builder在AnimatedSwitcher的child切换时会分别对新、旧child绑定动画: 对旧child,绑定的动画会反向执...
AnimatedSwitcher 当switcher发生变化时会执行过渡动画到新的状态 也可以自己实现隐式动画TweenAnimationBuilder TweenAnimationBuilder(tween:Tween<double>(begin:0,end:_value),duration:Duration(seconds:1),builder:(BuildContextcontext,doublevalue,Widgetchild){returnContainer(width:value,height:value,child:child,);}...
The relevant error-causing widget was: AnimatedSwitcher AnimatedSwitcher:file:///home/jim/Developer/animated_switcher_bug/lib/main.dart:32:15 When the exception was thrown, this was the stack: #0 debugChildrenHaveDuplicateKeys.<anonymous closure> (package:flutter/src/widgets/debug.dart:210:7) #1...
空白处不会触发opaque 不透明模式...forward 状态不一样 reverse 方向启动动画 repeat 重复使动画运行 stop 停止动画 reset 重置动画 大概了解了 AnimationController ,接下来通过一个实际的小例子来加深下印象...那么Flutter也提供了一个部件AnimationWidget 来实现动画部件,就不需要一直监听了,还是实现上面的例子 ...
1.animated_container(放大 缩小github:https://github.com/geeklx/flutter_app2/tree/master/app2/animated_container):AnimationContainer使用要点,必须传入Duration告诉动画的播放时间,当animationContainer接收到一个新的值的时候,会根据老值进行补间动画,例如开始宽高为100,然后给了新值0并setState后,AnimationContaine...
CupertinoNavigationBar (nav_bar.dart) TabBar (tabs.dart) PreferredSize (preferred_size.dart) StatelessWidget (framework.dart) Page (main.dart) AboutListTile (about.dart) AboutDialog (about.dart) Builder (basic.dart) KeyedSubtree (basic.dart) ...
Just wrapping the animation in a RepaintBoundary was the workaround for my case. When I wrapped the child of the AnimatedSwitcher with RepaintBoundary, the error did not occur, but the AnimatedSwitcher did not work. This problem seems to be related to the animated switcher not detecting that ...
1.animated_container(放大 缩小github:https://github.com/geeklx/flutter_app2/tree/master/app2/animated_container):AnimationContainer使用要点,必须传入Duration告诉动画的播放时间,当animationContainer接收到一个新的值的时候,会根据老值进行补间动画,例如开始宽高为100,然后给了新值0并setState后,AnimationContaine...