React Native自定义组件—

这里用到的其实是一个新的场景页面而不是像原生的组件一样悬浮在页面之上，它实现的原理是从新绘制一个带弹出框样式的页面，除了弹出框之外都是灰色的，且将要显示弹出框页面的布局完全移植过来。

这里通过 BackAndroid API 实现了点击返回键自定义对话框消失的效果

BackAndroid API 的工作机制是，当挂接多个Listener 后，用户按下返回键时，多个Listener 都会监听到返回键按下事件，并且他们的处理函数都会被执行，执行的顺序是天津的顺序，这些处理函数都执行后，只要有一个处理函数返回了true（表示返回键被按下事件已经被处理），返回键被按下事件就不会交个Android框架处理，也就是说，应用程序没有办法退出。

程序的入口文件 index.android.js

import React,{Component} from 'react';
import {AppRegistry,Navigator,BackAndroid,Alert} from 'react-native';

import RegisterLeaft from './RegisterLeaft';
import WaitingLeaft  from './WaitingLeaft';

export default class NavigatorModule extends Component {
  
  constructor (props) {
    super(props)
    this.handleBack = this._handleBack.bind(this) // 返回一个绑定好this的方法并存储于当前实例中
  }
  
  configureScene(router){
    return Navigator.SceneConfigs.FadeAndroid;
  }
   
   renderScene(router,navigator){
    switch(router.name) {
   	case  "register":
   		return <RegisterLeaft navigator={navigator}/>
   	case  "waiting" :
   		return <WaitingLeaft 
             phoneNumber = {router.phoneNumber}
   		       userPW = {router.userPW}  
             navigator={navigator}
   		/>
   }
  }
 componentDidMount() {
     BackAndroid.addEventListener("NoviModuleListener",this.handleBack);
   }

  _handleBack () {
    const nav=this.navigator;
    if(nav!=null){
      const routers=nav.getCurrentRoutes();    
      if(routers.length>1){
      nav.pop();
      return true;
     }
    }
    return false;
  }

   componentWillUnount(){
     BackAndroid.removeEventListener("NoviModuleListener",this.handleBack);
   }

   render(){
     return(
      <Navigator
       ref={nav => {this.navigator=nav}}
       initialRoute={{name:'register'}}
       configureScene={this.configureScene}
       renderScene ={(route,navigator) =>this.renderScene(route,navigator)}
      />
     );
  }
}
   
AppRegistry.registerComponent('AwesomeProject',() => NavigatorModule);

对话框组件 ConfirmDialog.js

import React,View,Text,StyleSheet,Alert} from 'react-native';

let Dimensions = require('Dimensions');
let totalWidth = Dimensions.get('window').width;
let totalHeight = Dimensions.get('window').height;

export default class ConfirmDialog extends Component{

 constructor (props) {
    super(props)
    this.newHandleBack = this._newHandleBack.bind(this) // 返回一个绑定好this的方法并存储于当前实例中
  }
    render(){
        return(
            <View style={styles.ConfirmContent}>
                <View style={styles.dialogStyle}>
                   <Text style={styles.textPrompt}>
                   {this.props.promptToUser}
                   </Text>
                   <Text style={styles.yesButton}
                    onPress = {()=>{this.props.userConfirmed()}}
                    >
                    {'\r\n'}确定
                   </Text>
                   <Text style={styles.cancelButton}
                    onPress = {()=>{this.props.userCanceled()}}
                    >
                    {'\r\n'}取消
                   </Text>
                </View>
            </View>
        );
    }

    componentDidMount() {
        let amIStillAlive = this.props.amIStillAlive;
        let navigator =this.props.navigator;
        BackAndroid.addEventListener("ConfirmDialogListener",this.newHandleBack);
    }
    componentWillUnmount(){
       BackAndroid.removeEventListener("ConfirmDialogListener",this.newHandleBack);
    }

    _newHandleBack () {
        let amIStillAlive = this.props.amIStillAlive();
        let navigator =this.props.navigator;
       if(amIStillAlive==true){
              this.props.userCanceled();
              return true;
         }
          return false;
     }
}

let styles = StyleSheet.create({
    ConfirmContent:{
      position:"absolute",top:0,width:totalWidth,height:totalHeight,backgroundColor:'rgba(52,52,0.5)'
    },dialogStyle:{
      position:"absolute",top:totalHeight * 0.4,left:totalWidth / 10,width:totalWidth * 0.8,height:totalHeight * 0.3,backgroundColor:'white'
    },textPrompt:{
        position:'absolute',top:10,left:10,fontSize:20,color:'black'
    },yesButton:{
        position:'absolute',bottom:10,width:totalWidth*0.35,height:totalHeight*0.1,backgroundColor:'gray',color:'white',textAlign:'center'
    },cancelButton:{
        position:'absolute',right:10,textAlign:'center'
    }
}
);

注册页面 RegisterLeaft.js

import React,TextInput,Alert,Navigator} from 'react-native';

import ConfirmDialog  from './ConfirmDialog';
let Dimensions = require('Dimensions');
let totalWidth = Dimensions.get('window').width;
let leftStartPoint = totalWidth * 0.1;
let componentWidth = totalWidth * 0.8;

export default class RegisterLeaft  extends Component {

 constructor(props) {
    super(props);
    this.state={
     inputedNum:"",inputedPW:"",needToConfirm:false
    };
 }

  render() {
        if(this.state.needToConfirm==true) 
        return this.renderWithDialog();
        return ( 
         	<View style = {styles.container} > 
         	<TextInput style = {styles.numberInputStyle}
            placeholder = {'请输入手机号:'} 
            onChangeText={(inputedNum)=>this.setState({inputedNum})}
            />
            <Text style = {styles.textPromptStyle} >
            您输入的手机号：{this.state.inputedNum}
            </Text >
            <TextInput style = {styles.passwordInputStyle}
            placeholder = { '请输入密码' }
            onChangeText={(inputedPW)=>this.setState({inputedPW})}
            password = 'true'
            /> 
            <Text style = {styles.bigTextPrompt}
              onPress = {()=>{this.userPressConfirm()}}
            >
            确定
            </Text> 
            </View>);
        } 
        
        renderWithDialog(){
            return ( 
         	<View style = {styles.container} > 
         	<TextInput style = {styles.numberInputStyle}
            placeholder = {'请输入手机号:'} 
            onChangeText={(inputedNum)=>this.setState({inputedNum})}
            />
            <Text style = {styles.textPromptStyle} >
            您输入的手机号：{this.state.inputedNum}
            </Text >
            <TextInput style = {styles.passwordInputStyle}
            placeholder = {'请输入密码'}
            onChangeText={(inputedPW)=>this.setState({inputedPW})}
            password = 'true'
            /> 
            <Text style = {styles.bigTextPrompt}
              onPress ={()=>{this.userPressConfirm()}}
            >
            确定
            </Text> 
            <ConfirmDialog
             userConfirmed={()=>{this.userConfirmed()}}
             userCanceled = {()=>{this.userCanceled()}}
             amIStillAlive= {()=>{this.tellConfirmDialogItsStatus()}}
             promptToUser ={'使用'+this.state.inputedNum+'号码登录?'}
            >
            </ConfirmDialog>
            </View>);
        }
       
    userPressConfirm(){
        this.setState({needToConfirm:true});
        
    }
    userCanceled(){
        this.setState({needToConfirm:false});
    }
    userConfirmed(){
        this.setState({needToConfirm:true});
        this.props.navigator.push({
            phoneNmuber:this.state.inputedNum,userPW:this.state.inputedPW,name:"waiting"
        });
    }

   tellConfirmDialogItsStatus(){
        return this.state.needToConfirm;
    }

        
  }

let styles = StyleSheet.create({
    container: {
        flex: 1,backgroundColor: 'white'
    },numberInputStyle: {
        top: 20,left: leftStartPoint,width: componentWidth,backgroundColor: 'gray',fontSize: 20

    },textPromptStyle: {
        top: 30,fontSize: 20
    },passwordInputStyle: {
        top: 50,bigTextPrompt: {
        top: 70,color: 'white',textAlign: 'center',fontSize: 40
    }
});

等待页面 WaitingLeaft.js

import React,TextInput} from 'react-native';

export default class WaitingLeaft extends Component{

    render() {
         return ( 
         	<View style = {styles.container} > 
            <Text style = {styles.textPromptStyle} >
             注册使用手机号码：{this.props.phoneNumber} 
            </Text >
            <Text style = {styles.textPromptStyle} >
            注册使用密码：{this.props.userPW} 
            </Text >
            <Text style = {styles.bigTextPrompt}
             onPress = {this.goBack.bind(this)}
            >
             返回
            </Text> 
            </View>);
        }

        goBack(){
           this.props.navigator.push(
                {
                    name:"register"
                }
            );
        }
  }

let styles = StyleSheet.create({
    container: {
        flex: 1,justifyContent:'center',alignItems:'center',backgroundColor:'#F5FCFF'
    },textPromptStyle: {
        fontSize: 20

    },bigTextPrompt: {
        width: 300,fontSize: 60
    }
});

代码链接: https://pan.baidu.com/s/1c2EHTD2 密码: hy7b

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