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
我们先来看下官方提供的例子,监听键盘的弹出与消失。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 (); } }
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();