React Native - 在状态内的对象上设置状态 [英] React Native - setState on object inside state

问题描述

我在模态屏幕上有两个文本输入，当我填充第一个输入时 - 状态已更新，当我跳转到第二个输入并开始输入时 - 第一个输入的值为空.

I have two text inputs on modal screen, when I'm filling first input - state is updated, and when I jump on second input and start typing - value of the first input is empty.

代码如下:

constructor(){
    super()
    this.state={
    Modal: {
        EduModalVisible: false,
        ProTitleModalVisible: false,
        PsychoModalityModalVisible: false,
    },

    User: { 
        NameOfFaculty: '',
        YearOfGraduate: '',
    }
}

}

文本输入如下所示:

<TextField label={'Faculty'} highlightColor={'#76a6ef'}
        value={this.state.User.NameOfFaculty} onChangeText={(faculty) => this.setState({User: { NameOfFaculty: faculty }})} />
<TextField label={'Year Of Graduation'} highlightColor={'#76a6ef'}
        value={this.state.User.YearOfGraduate} onChangeText={(year) => this.setState({User: { YearOfGraduate: year }})} />

我认为问题在于更新状态内对象的状态，但我不确定如何解决.

I think that problem is in updating state of object inside state, but I'm not sure how to solve this.

推荐答案

举个例子:https://snack.expo.io/rkeQ7cxWb

您需要为现有对象分配属性以保留其内容:

You need to assign the property for the existing object in order to preserve it contents:

onChangeText={(faculty) => {
  const User = Object.assign({}, this.state.User, { NameOfFaculty: faculty });
  this.setState({ User });
}}

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