我正在尝试使用mobx和Typescript创建一个React应用程序。但这不起作用。
我希望计时器能计时秒数。而且我看到该事件发生并更新了计数器。但是该组件不会重新渲染。我在做什么错了?
import React from "react";
import { observable, action } from "mobx";
import { observer, inject, Provider } from "mobx-react";
export class TestStore {
@observable timer = 0;
@action timerInc = () => {
this.timer += 1;
};
}
interface IPropsTestComp {
TestStore?: TestStore;
}
@inject("TestStore")
@observer
export class TestComp extends React.Component<IPropsTestComp> {
constructor(props: IPropsTestComp) {
super(props);
setInterval(() => {
this.props.TestStore!.timerInc();
}, 1000);
}
render() {
return <div>{this.props.TestStore!.timer}</div>;
}
}
export class TestApp extends React.Component {
render() {
return <Provider TestStore={new TestStore()}>
<TestComp />
</Provider>
}
}
答案 0 :(得分:4)
您正在使用MobX 6吗?
Decorator API与MobX 5相比有所变化,现在您需要在构造函数中使用makeObservable
方法来实现与以前相同的功能:
import { observable, action, makeObservable } from "mobx";
export class TestStore {
@observable timer = 0;
constructor() {
makeObservable(this);
}
@action timerInc = () => {
this.timer += 1;
};
}
尽管有新事物可能会让您完全放弃装饰器,makeAutoObservable
:
import { makeAutoObservable } from "mobx";
export class TestStore {
timer = 0;
constructor() {
// Don't need decorators now, just this call
makeAutoObservable(this);
}
timerInc = () => {
this.timer += 1;
};
}