《React-Native系列》39、 ReactNative之键盘Keyboard

来源：互联网发布：奢侈品复刻1:1淘宝编辑：程序博客网时间：2024/05/17 03:22

今天我们来说下RN对键盘事件的支持。

在react-native 的Component组件中有个Keyboard.

github地址如下：https://github.com/facebook/react-native/tree/770091f3c13f7c1bd77c50f979d89a774001fbf0/Libraries/Components/Keyboard

我们先来看下官方提供的例子，监听键盘的弹出与消失。Demo如下：

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}      />    );  }}

Keyboard支持的监听事件如下：

@param {string} nativeEvent The `nativeEvent` is the string that identifies the event you're listening for.  This can be any of the following:- `keyboardWillShow`- `keyboardDidShow`- `keyboardWillHide`- `keyboardDidHide`- `keyboardWillChangeFrame`- `keyboardDidChangeFrame`

使用的时候需要测试下Android和iOS下监听的事件是否都ok。

踩坑如下：

Android 对keyboardWillShow 监听不到。

同样，我们在源码里可以找到使键盘消失的函数

  /**   * Dismisses the active keyboard and removes focus.   */  dismiss () {    dismissKeyboard();  }

我们如果需要使用时，可以如下：

const dismissKeyboard = require('dismissKeyboard’);dismissKeyboard();

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