1 代码示例

class CountController extends GetxController {
  final _count = 0.obs;
  set count(value) => this._count.value = value;
  get count => this._count.value;
  add() => _count.value++;
  @override
  void onInit() {
    super.onInit();
    // 值每变一次都会立刻触发
    ever(_count, (value) {
      print("ever -> $value" );
    });
    // 只有第一次值改变触发
    once(_count, (value) {
      print("once -> $value");
    });
    // 指定时间后触发回调函数, 在该时间段内值多次改变只会生效一次(最新值)
    debounce(
      _count,
      (value) {
        print("debounce -> $value");
      },
      time: Duration(seconds: 2),
    );
    // 指定时间后触发回调函数, 在该时间段内值多次改变只会生效一次(最旧值)
    interval(
      _count,
      (value) {
        print("interval -> $value");
      },
      time: Duration(seconds: 1),
    );
  }
}

class StateWorkersView extends StatelessWidget {
  StateWorkersView({Key? key}) : super(key: key);
  final controller = CountController();
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text("GetBuilder"),
      ),
      body: Center(
        child: Column(
          children: [
            // 这里只能用GetX, 用Obx无法调用OnInit
            GetX<CountController>(
              init: controller,
              initState: (_) {},
              builder: (_) {
                return Text('value -> ${_.count}');
              },
            ),
            // 按钮
            ElevatedButton(
              onPressed: () {
                controller.add();
              },
              child: Text('add'),
            ),
          ],
        ),
      ),
    );
  }
}