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ReactNative学习笔记(七)Navigator的使用

前言

Navigator主要用于ReactNative中的跳转,中文文档:

http://reactnative.cn/docs/0.39/using-navigators.html

懒得打字介绍更多了,将上面的官网文档看一遍之后应该有个大概了解了。

  • initialRoute 配置初始路由参数;
  • configureScene 用于配置场景动画;
  • renderScene 指示具体如何渲染一个场景;
  • 一个可选的导航栏组件,个人感觉这个不太好用,一般不用它;
  • {...route.passProps}用于批量传递参数到this.props

简单示例

下面写了一个最简单的页面跳转与返回的例子test-navigator-no-bar.js

效果图:

_W295xH178_

import React, { Component } from 'react';
import { AppRegistry, Text, Image, View, StyleSheet, Navigator, TouchableOpacity } from 'react-native';

// 一个简单的navigator使用示例
export default class TestNavigator extends Component
{
	configureScene(route, routeStack)
	{
		return Navigator.SceneConfigs.PushFromRight;
	}
	render()
	{
		return (
			<Navigator
				style={{flex:1}}
				initialRoute={{component: FirstPage}}
				configureScene={this.configureScene}
				renderScene={(route, navigator) => <route.component navigator={navigator} {...route.passProps} />} />
		);
	}
}

// 首页
class FirstPage extends Component
{
	render()
	{
		return (
			<View>
				<TouchableOpacity onPress={() => this.props.navigator.push({component: SecondPage})}>
					<Text style={{fontSize:28}}>点击跳转到二级页面</Text>
				</TouchableOpacity>
			</View>
		);
	}
}

// 二级页面
class SecondPage extends Component
{
	render()
	{
		return (
			<View>
				<TouchableOpacity onPress={()=>this.props.navigator.pop()}>
					<Text style={{color: 'red', fontSize: 28}}>点击返回首页</Text>
				</TouchableOpacity>
			</View>
		);
	}
}

带导航的示例

效果图:

_W632xH282_

完整代码如下(test-navigator-with-bar.js):

import React, { Component } from 'react';
import { AppRegistry, Text, Image, View, StyleSheet, TextInput, ScrollView, ListView, Navigator, TouchableOpacity } from 'react-native';


// 一个简单的navigator使用示例
export default class TestNavigator extends Component
{

	configureScene(route, routeStack)
	{
		if (route.type == 'Modal') {
			return Navigator.SceneConfigs.FloatFromBottom;
		}
		return Navigator.SceneConfigs.PushFromRight;
	}

	render()
	{
		return (
			<Navigator
				style={{flex:1}}
				initialRoute={{component: FirstPage, passProps: {title: '首页', rightText: '菜单'}}}
				configureScene={this.configureScene}
				renderScene={(route, navigator) => <route.component route={route} navigator={navigator} {...route.passProps} />}
				navigationBar={
					<Navigator.NavigationBar
						style={styles.navContainer}
						routeMapper={NavigationBarRouteMapper}/>} />
		);
	}
}

// 首页
class FirstPage extends Component
{
	/**
	 * 跳转
	 */
	gotoPage(component, title)
	{
		this.props.navigator.push(
		{
			component: component,
			passProps: {
				title: '二级页面',
				lastPageTitle: this.props.title
			}
		})
	}

	render()
	{
		return (
			<View style={{paddingTop: 80}}>
				<TouchableOpacity onPress={() => this.gotoPage(SecondPage, '二级页面')}>
					<Text style={{fontSize:28, padding: 10}}>点击跳转到二级页面</Text>
				</TouchableOpacity>
				<Text style={{padding: 10, fontSize: 20}}>这是首页,这是首页,这是首页,这是首页,这是首页,这是首页,这是首页,这是首页,这是首页,这是首页,这是首页</Text>
			</View>
		);
	}
}

// 二级页面
class SecondPage extends Component
{
	render()
	{
		return (
			<View style={{paddingTop: 80}}>
				<TouchableOpacity
					style={styles.button}
					onPress={()=>this.props.navigator.pop()}>
					<Text style={styles.buttonText}>
						点击返回{this.props.lastPageTitle}
					</Text>
				</TouchableOpacity>
			</View>
		);
	}
}

// 导航栏的Mapper
var NavigationBarRouteMapper =
{
	// 左键
	LeftButton(route, navigator, index, navState)
	{
		if (index <= 0) return null;
		return (
			<TouchableOpacity
				underlayColor='transparent'
				onPress={() => {if (index > 0) {navigator.pop()}}}>
				<Text style={styles.leftNavButtonText}>
					返回
				</Text>
			</TouchableOpacity>
		);
	},
	// 右键
	RightButton(route, navigator, index, navState)
	{
		if(!route.passProps.rightText) return null;
		return (
			<TouchableOpacity
				onPress={() => alert('测试菜单')}>
				<Text style={styles.rightNavButtonText}>
					{route.passProps.rightText}
				</Text>
			</TouchableOpacity>
		);
	},
	// 标题
	Title(route, navigator, index, navState)
	{
		return (
			<Text style={styles.title}>
				{route.passProps.title || '默认标题'}
			</Text>
		);
	}
};


var styles = StyleSheet.create({
	// 页面框架
	container: {
		flex: 4,
		marginTop: 100,
		flexDirection: 'column'
	},
	// 导航栏
	navContainer: {
		backgroundColor: '#41ABF7',
		paddingTop: 12,
		paddingBottom: 10,
		flex: 1
	},
	// 导航栏文字
	headText: {
		color: '#ffffff',
		fontSize: 22
	},
	// 按钮
	button: {
		height: 120,
		marginTop: 10,
		justifyContent: 'center', // 内容居中显示
		backgroundColor: '#ff1049',
		alignItems: 'center'
	},
	// 按钮文字
	buttonText: {
		fontSize: 18,
		color: '#ffffff'
	},
	// 左面导航按钮
	leftNavButtonText: {
		color: '#ffffff',
		fontSize: 18,
		marginLeft: 13,
		marginTop: 12,
		flex: 1
	},
	// 右面导航按钮
	rightNavButtonText: {
		color: '#ffffff',
		fontSize: 18,
		marginRight: 13,
		marginTop: 12,
		flex: 1
	},
	// 标题
	title: {
		fontSize: 18,
		color: '#fff',
		textAlign: 'center',
		alignItems: 'center',
		justifyContent: 'center',
		fontWeight: 'bold',
		marginTop: 12
	}
});

关于动画

所有可用的场景动画:

console.log(Navigator.SceneConfigs);

_W398xH309_

其它

判断一个页面是否能够继续返回:

var navigator = this.props.navigator;
if(navigator.getCurrentRoutes().length > 1)
{
	navigator.pop();
}
else
{
	alert('不能再返回了!');
}
posted @ 2018-03-15 11:25  我是小茗同学  阅读(5449)  评论(0编辑  收藏  举报