对象的setState - React Native

Question

我有这样的例子：

this.state = {
      lang1: { name: 'Anglais', code: "en" },
      lang2: { name: 'Français', code: "fr" }
};

我如何设置lang1.name的状态？当我这样做时，它不起作用：

this.setState({ lang1.name: "myExample" });

我是React Native的新人，我对此并不清楚

Answer 1

this.setState({
  lang1: {
    name: "myExample",
    code: this.state.lang1.code
  }
});

Answer 2

You can just do this. ... just adds exiting keys and then adds/overwrites new ones

this.setState({
	lang1:{
		...this.state.lang1,
		name: "myExample"
	}
})

Answer 3

你可以这样做：

this.setState((previousState) => {
  const lang1 = previousState.lang1
  return {...lang1, name: 'myExample'}
})

Answer 4

值是参数...

let data = this.state.objectState
data[prop] = value
this.setState({objectState: data})