在 React Native 中从父组件调用子函数 [英] Call child function from parent component in React Native

问题描述

我正在开发我的第一个 React Native 应用程序.我想要实现的是从父组件执行子函数，情况是这样的:

I'm developing my first React Native app. What I'm trying to achieve is to execute a child function from the parent component, this is the situation:

儿童

export default class Child extends Component {
  ...
  myfunct: function() {
    console.log('Managed!');
  }
  ...
  render(){
    return(
      <Listview
      ...
      />
    );
  }
}

父母

export default class Parent extends Component {
  ...
  execChildFunct: function() {
    ...
    //launch child function "myfunct"
    ...
    //do other stuff
  }

  render(){
    return(
      <View>
        <Button onPress={this.execChildFunct} />
        <Child {...this.props} />
      </View>);
  }
}

在这个例子中，当我按下父类中的按钮时，我想记录 'Managed!'.可行性如何?

In this example, I would like to log 'Managed!' when I press the button in the parent class. How is it feasible?

推荐答案

Nader Dabit 的回答已经过时，因为在 ref 属性中使用字符串文字 已弃用.这是我们截至 2017 年 9 月的做法:

Nader Dabit's answer is outdated, since using String literals in ref attributes has been deprecated. This is how we would do it as of September 2017:

<Child ref={child => {this.child = child}} {...this.props} />
<Button onPress={this.child.myfunc} />

相同的功能，但不是使用字符串来引用组件，而是将其存储在全局变量中.

Same functionality, but instead of using a String to reference the component, we store it in a global variable instead.

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