react native 自己动手写弹框浮层

效果图

image.png

提供的方法 和 属性

  ref.show() // ref 主动调用显示打开
  ref.hide() // ref 主动调用隐藏关闭
  modalBoxHeight: 300, // 盒子高度
  modalBoxBg: '#fff', // 盒子背景色
  hide: function () { }, // 关闭时的回调函数
  transparentIsClick: true  // 透明区域是否可以点击

简单使用方式

import React, { Component } from 'react'
import PopUp from './PopUp'
import { View, Text, TouchableOpacity } from 'react-native'

export default class App extends Component {
  render() {
    return (
      <View style={{ alignItems: 'center' }}>
        <Text style={{ marginTop: 200 }} onPress={() => { this.popUp.show() }}>打开弹框</Text>
        <PopUp ref={ref => this.popUp = ref}>
          <TouchableOpacity onPress={() => { this.popUp.hide() }} style={{ alignItems: 'center', backgroundColor: '#316DE6', height: 45, width: 80, borderRadius: 8, alignSelf: 'center', justifyContent: 'center', marginTop: 50 }}>
            <Text style={{ color: '#fff' }}>关闭弹框</Text>
          </TouchableOpacity>
        </PopUp>
      </View>
    )
  }
}

组件代码

import React, { Component } from 'react'
import { StyleSheet, View, TouchableOpacity, Animated, Easing, Dimensions } from 'react-native'

/**
 * 弹出层
 */
const { width, height } = Dimensions.get('window')
export default class PopUp extends Component {
  constructor(props) {
    super(props)
    this.state = {
      offset: new Animated.Value(0),
      show: false
    }
  }

  in() {
    Animated.timing(
      this.state.offset,
      {
        easing: Easing.linear,
        duration: 300,
        toValue: 1
      }
    ).start()
  }

  out() {
    Animated.timing(
      this.state.offset,
      {
        easing: Easing.linear,
        duration: 300,
        toValue: 0
      }
    ).start()

    setTimeout(
      () => this.setState({ show: false }),
      300
    )
  }

  show() {
    this.setState({
      show: true
    }, this.in())
  }

  hide() {
    this.out()
  }

  defaultHide() {
    this.props.hide()
    this.out()
  }


  render() {
    let { transparentIsClick, modalBoxBg, modalBoxHeight } = this.props
    if (this.state.show) {
      return (
        <View style={[styles.container, { height: height }]}>
          <TouchableOpacity style={{ height: height - modalBoxHeight }} onPress={transparentIsClick && this.defaultHide.bind(this)}>
            {/* <View style={{ height: screen.height - screen.height * 0.076 }}></View> */}
          </TouchableOpacity>
          <Animated.View
            style={[styles.modalBox, {
              height: height, top: 0, backgroundColor: modalBoxBg,
              transform: [{
                translateY: this.state.offset.interpolate({
                  inputRange: [0, 1],
                  outputRange: [height, height - modalBoxHeight]
                }),
              }]
            }]}>
            {this.props.children}
          </Animated.View>
        </View>
      )
    }
    return <View />
  }
}

const styles = StyleSheet.create({
  container: {
    width: width,
    backgroundColor: 'rgba(0, 0, 0, 0.6)',
    position: 'absolute',
    top: 0,
    zIndex: 9
  },
  modalBox: {
    position: 'absolute',
    width: width
  }
})

PopUp.defaultProps = {
  modalBoxHeight: 300, // 盒子高度
  modalBoxBg: '#fff', // 背景色
  hide: function () { }, // 关闭时的回调函数
  transparentIsClick: true  // 透明区域是否可以点击
}