import 'package:get/get.dart';

class CalcDemo extends GetxController {
  int counter = 0;
  void increment(){
    counter++;
    update(); // GetxController通过update()更新GetBuilder
  }

  @override
  void onInit() {
    print("on init...");
    super.onInit();
  }
  @override
  void onClose() {
    print("on close...");
    super.onClose();
  }
  @override
  void onReady() {
    print("on ready...");
    super.onReady();
  }
}

Performing hot reload...
Syncing files to device iPhone 11...
Reloaded 0 of 618 libraries in 60ms.

[GETX] GOING TO ROUTE /() => Demo3
flutter: on init...
[GETX] Instance "CalcDemo" has been created
[GETX] Instance "CalcDemo" has been initialized
flutter: on ready...
[GETX] CLOSE TO ROUTE /() => Demo3
flutter: currentRoute.isDialog false
flutter: on close...
[GETX] "CalcDemo" onDelete() called
[GETX] "CalcDemo" deleted from memory

// 方式1
var name = 'Taoya'.obs; // 会转化Rx类型

// 方式2
final name = RxString('Taoya'); // Rx{Type}

// 方式3
final name = Rx<String>('Taoya'); // Rx<Type> 指定泛型

// 延展
1. 将我们的类值转换为 obs
class RxUser {
  final name = "Camila".obs;
  final age = 18.obs;
}

2. 将整个类转换为一个可观察的类
class User {
  User({String name, int age});
  var name;
  var age;
}
//实例化时。
final user = User(name: "Camila", age: 18).obs;
转化为可观察的变量后，它的类型不再是原生类型，所以取值不能用变量本身，而是.value

Obx(()=> Text(controller.name));

// controller
final count1 = 0.obs;
final count2 = 0.obs;
int get sum => count1.value + count2.value;

// 视图
GetX<Controller>(
  builder: (controller) {
    print("count 1 rebuild");
    return Text('${controller.count1.value}');
  },
),
GetX<Controller>(
  builder: (controller) {
    print("count 2 rebuild");
    return Text('${controller.count2.value}');
  },
),
GetX<Controller>(
  builder: (controller) {
    print("count 3 rebuild");
    return Text('${controller.sum}');
  },
),