ReactNative之键盘Keyboard的弹出与消失示例

在开发中经常遇到需要输入的地方，所以就学习了一下ReactNative键盘Keyboard的弹出与消失的方法，留个笔记。

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(); 

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。