<Modal
 animationType='slide'      // 从底部滑入 
 transparent={false}       // 不透明
 visible={this.state.isModal}  // 根据isModal决定是否显示
 onRequestClose={() => {this.onRequestClose()}} // android必须实现
 >

import React, { Component} from 'react';
import {
  AppRegistry,
  View,
  Modal,
  TouchableOpacity,
  Text
} from 'react-native';
export default class ModalView extends Component {
  constructor(props) {
    super(props);
    this.state = {
      modalVisible: false,
    }
  }
  setModalVisible = (visible)=> {
    this.setState({
      modalVisible: visible
    })
  };
  render(){
    return(
      <View style={{flex: 1, justifyContent: 'center', alignItems: 'center', backgroundColor: '#ffaaff'}}>
        <Modal animationType={'none'}
            transparent={true}
            visible={this.state.modalVisible}
            onrequestclose={() => {alert("Modal has been closed.")}}
            onShow={() => {alert("Modal has been open.")}}
            supportedOrientations={['portrait', 'portrait-upside-down', 'landscape', 'landscape-left', 'landscape-right']}
            onOrientationChange={() => {alert("Modal has been OrientationChange.")}}>
          <View style={{flex:1, marginTop: 22, backgroundColor: '#aaaaaa', justifyContent: 'center', alignItems: 'center'}}>
            <View>
              <Text>Hello World!</Text>
              <TouchableOpacity onPress={() => {
                this.setModalVisible(false)
              }}>
                <Text>隐藏 Modal</Text>
              </TouchableOpacity>
            </View>
          </View>
        </Modal>
        <TouchableOpacity onPress={() => {
          this.setModalVisible(true)
        }}>
          <Text>显示 Modal</Text>
        </TouchableOpacity>
      </View>
    )
  }
}
AppRegistry.registerComponent('ModalView', ()=>ModalView);