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();