React Native - 模态
在本章中,我们将向您展示如何在 React Native 中使用模态组件。
现在让我们创建一个新文件:ModalExample.js
我们将逻辑放入 ModalExample 中。我们可以通过运行 toggleModal 来更新初始状态。
通过运行 toggleModal 更新初始状态后,我们将为模态设置 visible 属性。当状态改变时,此属性将被更新。
Android 设备需要 onRequestClose。
App.js
import React, { Component } from 'react'
import WebViewExample from './modal_example.js'
const Home = () => {
return (
<WebViewExample/>
)
}
export default Home;
modal_example.js
import React, { Component } from 'react';
import { Modal, Text, TouchableHighlight, View, StyleSheet}
from 'react-native'
class ModalExample extends Component {
state = {
modalVisible: false,
}
toggleModal(visible) {
this.setState({ modalVisible: visible });
}
render() {
return (
<View style = {styles.container}>
<Modal animationType = {"slide"} transparent = {false}
visible = {this.state.modalVisible}
onRequestClose = {() => { console.log("Modal has been closed.") } }>
<View style = {styles.modal}>
<Text style = {styles.text}>Modal is open!</Text>
<TouchableHighlight onPress = {() => {
this.toggleModal(!this.state.modalVisible)}}>
<Text style = {styles.text}>Close Modal</Text>
</TouchableHighlight>
</View>
</Modal>
<TouchableHighlight onPress = {() => {this.toggleModal(true)}}>
<Text style = {styles.text}>Open Modal</Text>
</TouchableHighlight>
</View>
)
}
}
export default ModalExample
const styles = StyleSheet.create ({
container: {
alignItems: 'center',
backgroundColor: '#ede3f2',
padding: 100
},
modal: {
flex: 1,
alignItems: 'center',
backgroundColor: '#f7021a',
padding: 100
},
text: {
color: '#3f2949',
marginTop: 10
}
})
我们的起始屏幕将如下所示 −
如果我们单击按钮,模态框将打开。

