我正在尝试在应用中滑动透明叠加层,这里非常类似(全部/过滤器):
到目前为止,我发现了react-native-slider和react-native-overlay。我将滑块修改为从上到下工作,但它总是沿着ListView向下移动。如果使用react-native-overlay,叠加层是静态的,我无法移动它。
我在原始反应原生教程in this gist中添加了一些演示代码。单击按钮时,内容应该粘住,菜单应叠加。透明度现在并不重要,但会很棒。
最聪明的解决方案是什么?
答案 0 :(得分:57)
ListView不向下移动的关键是将叠加层的位置设置为absolute
。通过这样做,您可以手动设置视图的位置和宽度/高度,它不再遵循flexbox布局。看看下面的简短示例。叠加层的高度固定为360,但您可以轻松地为其设置动画或使其动态化。
'use strict';
var React = require('react-native');
var Dimensions = require('Dimensions');
// We can use this to make the overlay fill the entire width
var { width, height } = Dimensions.get('window');
var {
AppRegistry,
StyleSheet,
Text,
View,
} = React;
var SampleApp = React.createClass({
render: function() {
return (
<View style={styles.container}>
<Text style={styles.welcome}>
Welcome to the React Native Playground!
</Text>
<View style={[styles.overlay, { height: 360}]} />
</View>
);
}
});
var styles = StyleSheet.create({
container: {
flex: 1,
justifyContent: 'center',
alignItems: 'center',
backgroundColor: '#F5FCFF',
},
welcome: {
fontSize: 20,
textAlign: 'center',
margin: 10,
},
// Flex to fill, position absolute,
// Fixed left/top, and the width set to the window width
overlay: {
flex: 1,
position: 'absolute',
left: 0,
top: 0,
opacity: 0.5,
backgroundColor: 'black',
width: width
}
});
AppRegistry.registerComponent('SampleApp', () => SampleApp);
module.exports = SampleApp;
答案 1 :(得分:12)
import React, { Component } from 'react';
import { Image, StyleSheet, View } from 'react-native';
export default class App extends Component {
render() {
return (
<Image source={{uri: 'http://i.imgur.com/IGlBYaC.jpg'}} style={s.backgroundImage}>
<View style={s.overlay}/>
</Image>
);
}
}
const s = StyleSheet.create({
backgroundImage: {
flex: 1,
width: null,
height: null,
},
overlay: {
position: 'absolute',
top: 0,
right: 0,
bottom: 0,
left: 0,
backgroundColor: 'red',
opacity: 0.3
}
});
答案 2 :(得分:2)
您可以使用此示例来创建叠加层。可以将状态更改为可见,将不可见状态更改为叠加。
import React, { Component } from "react";
import { View, Text, StyleSheet } from "react-native";
class Popup extends Component {
constructor(props) {
super(props);
this.state = {
isPopupTrue: true
};
}
render() {
return (
<View style={styles.container}>
{ this.state.isPopupTrue &&
(<View style={styles.overlay}>
<View style={styles.popup}>
<Text style={styles.text}> Overlay </Text>
</View>
</View>)
}
</View>
);
}
}
export const styles = StyleSheet.create({
container: {
flex:1,
backgroundColor: "#c0d6e4"
},
overlay: {
position: "absolute",
top: 0,
right: 0,
bottom: 0,
left: 0,
justifyContent: "center",
alignItems: "center",
backgroundColor: "gray",
opacity: 0.9,
},
text: {
width: "20%",
fontSize: 15,
color: "black",
fontWeight: "bold"
},
});
答案 3 :(得分:1)
最聪明的方式?
对我来说最聪明的方法是使用来自react-native的Modals来构建高度可自定义的响应式体验,您可以轻松设置模态的运动方向,设置透明度,切换可见性等等,我个人从未使用现有的npm模块来实现侧抽屉或导航栏, 我是用Modals做的 如果您希望我能提供一个示例代码片段,该代码片段使用Modals
实现导航抽屉答案 4 :(得分:1)
也许更好地使用ImageBackground
- 组件。
import {View, ImageBackground, Text} from 'react-native';
const styles = StyleSheet.create({
});
...
<ImageBackground
style={styles.image}
source={{uri: props.picture_url}}
>
<View style={styles.textbox}>
<Text style={styles.title} >CHILD OF IMAGE_BACKGROUND</Text >
</View>
</ImageBackground >
...
答案 5 :(得分:0)
我也遇到了同样的问题,
import {View,StyleSheet} from "react-native";
//where you want it to render
<View style={styles.overlaycontainer}>
<Text style={{color:"#fff"}}>Locating directions please wait ...</Text>
</View>
// at the bottom of your in styles
const styles = StyleSheet.create({
overlaycontainer:{
...StyleSheet.absoluteFillObject,
backgroundColor: '#000',
opacity:0.8,
justifyContent:"center",
alignItems:"center"
}
});