initAnimation method

void initAnimation()

Implementation

void initAnimation() {
  controller =
      AnimationController(duration: Duration(milliseconds: 150), vsync: this);

  offsetAnimation = Tween<double>(begin: -1, end: 0)
      .animate(CurvedAnimation(parent: controller, curve: Curves.ease))
    ..addListener(() {
      this.setState(() {});
    });
  // 播放
  controller.forward();
}