Reactnative 如何在 React Native 中检测键盘何时打开或关闭

1. You can use Keyboard class from facebook.

下面是一个示例代码.

import React, { Component } from 'react';
import { Keyboard, TextInput } from 'react-native';

class Example extends Component {
  componentWillMount () {
    this.keyboardDidShowListener = Keyboard.addListener('keyboardDidShow', this._keyboardDidShow);
    this.keyboardDidHideListener = Keyboard.addListener('keyboardDidHide', this._keyboardDidHide);
  }
    
  componentWillUnmount () {
    this.keyboardDidShowListener.remove();
    this.keyboardDidHideListener.remove();
  }
    
  _keyboardDidShow () {
    alert('Keyboard Shown');
  }
    
  _keyboardDidHide () {
    alert('Keyboard Hidden');
  }
    
  render() {
    return (
      <TextInput
        onSubmitEditing={Keyboard.dismiss}
      />
    );
  }
}

###2. 您还可以使用其他一些npm依赖项，比如100.

将组件导入到要使用它的文件中:

import KeyboardListener from 'react-native-keyboard-listener';

直接在代码中使用组件.组件不会渲染任何内容

<View>
  <KeyboardListener
    onWillShow={() => { this.setState({ keyboardOpen: true }); }}
    onWillHide={() => { this.setState({ keyboardOpen: false }); }}
  />
</View>

要安装此依赖项，请运行以下命令.

npm install --save react-native-keyboard-listener

Choose any you feel more convenient.