flutter-animation

问题 I'm using onpressed() to scroll down to bottom of the List view, but i want to achieve that without Pressing the botton, It must autoscroll for every screen opening. I tried to put it inside initState() its not working but if i press the button it wokrks How to make it autoScroll? Working code: floatingActionButton: new FloatingActionButton(child: Icon(Icons.arrow_downward),onPressed:_hola,) _hola(){ print("inti state started successfully"); controller1.animateTo( controller1.position

问题 Is there a way to set the duration of the animation in an AnimatedList? AnimatedList( key: _animList, initialItemCount: _myList.length, itemBuilder: (context, index, animation) { // duration = Duration(seconds: 1); <--- ???????? return SlideTransition( position: animation.drive( Tween(begin: Offset(1, 0), end: Offset(0, 0)) .chain(CurveTween(curve: Curves.bounceIn))), child: Container(color: Colors.red, height: 100, width: 100)); }); 回答1: So...after a short research, I realized that you can

问题 I have used flutter_offline library to display the offline and online message. The problem is that I want to hide the online message after some time. I can't figure out a way to remove a container when the status is connected but after some duration. Below is my code: body: OfflineBuilder( connectivityBuilder: ( BuildContext context, ConnectivityResult connectivity, Widget child, ) { final bool connected = connectivity != ConnectivityResult.none; return SingleChildScrollView( scrollDirection:

问题 body: Container(color: Colors.white, child: SingleChildScrollView( child : Column( children : [ Padding(padding: EdgeInsets.only(left : 23.0, top: 23.0, right: 23.0, bottom: 5.0), child : Text("Title", style: MyTextStyles.textNormal,)), ListView.builder( padding: EdgeInsets.only(left: 13.0, right: 13.0, bottom: 25.0), shrinkWrap: true, physics: NeverScrollableScrollPhysics(), itemCount: PersonModel.icData.length, itemBuilder: (context, index) { PersonModel _model = PersonModel.icData[index];

问题 body: Container(color: Colors.white, child: SingleChildScrollView( child : Column( children : [ Padding(padding: EdgeInsets.only(left : 23.0, top: 23.0, right: 23.0, bottom: 5.0), child : Text("Title", style: MyTextStyles.textNormal,)), ListView.builder( padding: EdgeInsets.only(left: 13.0, right: 13.0, bottom: 25.0), shrinkWrap: true, physics: NeverScrollableScrollPhysics(), itemCount: PersonModel.icData.length, itemBuilder: (context, index) { PersonModel _model = PersonModel.icData[index];

问题 Is it possible to create an animation in flutter that doesn't continously change its value, but only with a given time gaps? I have the following code working right now, but i'm sure there is a better solution out there. int aniValue = 0; bool lock = false; _asyncFunc() async { if(lock) return; else lock = true; await new Future.delayed(const Duration(milliseconds: 50), () { ++aniValue; if (aniValue == 41) { aniValue = 0; } }); lock = false; setState(() {}); _asyncFunc(); } 回答1: It is

问题 Is it possible to create an animation in flutter that doesn't continously change its value, but only with a given time gaps? I have the following code working right now, but i'm sure there is a better solution out there. int aniValue = 0; bool lock = false; _asyncFunc() async { if(lock) return; else lock = true; await new Future.delayed(const Duration(milliseconds: 50), () { ++aniValue; if (aniValue == 41) { aniValue = 0; } }); lock = false; setState(() {}); _asyncFunc(); } 回答1: It is

问题 I am trying to create a fade transition for pushing routes, for that created a custom route like class CustomPageRoute<T> extends MaterialPageRoute<T> { CustomPageRoute({WidgetBuilder builder, RouteSettings settings}) : super(builder: builder, settings: settings); @override Widget buildTransitions(BuildContext context, Animation<double> animation, Animation<double> secondaryAnimation, Widget child) { return FadeTransition(opacity:animation, child: child, ); } } And calling it from a button

问题 I want ot achieve this behavior in Flutter. Do you know if there is a built-in widget in Flutter that provides that fuctionality out of the box? 回答1: try this CustomScrollView : LayoutBuilder( builder: (context, constraints) { return CustomScrollView( slivers: <Widget>[ SliverPersistentHeader( pinned: true, delegate: Delegate(), ), SliverToBoxAdapter( child: Container( decoration: BoxDecoration( borderRadius: BorderRadius.all(Radius.circular(30)), border: Border.all( width: 2.0, color: Colors

问题 I know how to export Rive (Flare) files to use in Flutter apps but how can I import Adobe After Effects files to Rive? I know it is possible to do with Lottie but I am unable to figure out how to exactly do this. 回答1: You can easily import the bodymovin json file. Check the attached image. rive.com online 来源： https://stackoverflow.com/questions/59404997/use-of-after-effects-files-in-flutter