Flutter TickerProvider使用

Flutter TickerProvider使用

• 当需要使用Animation controller时，需要在控制器初始化时传递一个vsync参数，此时需要用到TickerProvider，例如

  class _HomeState extends State<Home> with SingleTickerProviderStateMixin {
    Animation<double> _animation;
    AnimationController _animationController;
  
    GoogleSignIn _googleSignIn;
    GoogleSignInAccount _googleSignInAccount;
    GoogleSignInAuthentication _googleSignInAuthentication;
    FirebaseAuth _auth;
  
    @override
    void initState() {
      super.initState();
      _animationController =
          AnimationController(vsync: this, duration: Duration(seconds: 4));
      _animation = Tween<double>(begin: -1.0, end: 0.0).animate(CurvedAnimation(
          parent: _animationController, curve: Curves.fastOutSlowIn));
  
      _animationController.forward();
    }
  
    @override
    void dispose() {
      _animationController.dispose();
      super.dispose();
    }
    
    @override
    Widget build(BuildContext context) {
  return widget();
  }
  }
  

  然后在vsync参数中将this穿进去即可

• 但是SingleTickerProviderStateMixin只适用于单个AnimationController的情况，如需使用多个AnimationController，请使用TickerProviderStateMixin

参考：https://stackoverflow.com/questions/58280192/animationcontroller-can-we-pass-the-tickerprovider-vsync-to-an-other-class