react native 文字轮播的实现示例

import React, { Component } from "react"import { View, Text, TouchableOpacity } from "react-native"export default class TextLantern extends Component {  constructor(props) {    super(props)    this.state = {      nowText: "", // 显示的文本      opacity: 1, // 透明度      index: 0, // 下标      list: [], // 滚动的列表    }  }  componentWillMount() {    const { list } = this.props    this.setState({      nowText: list[0].title, // 插入显示的文本      list, // 滚动的列表    })    this.onStart() // 启动计时器 A  }  onStart = () => {    const { Intervals = 5000 } = this.props // Intervals 可为参数非必传    this.timer = setInterval(() => {      this.onDisappear() // 间隔Intervals毫秒启动计时器B    }, Intervals)  };  onDisappear = () => {    this.timer1 = setInterval(() => {      const { opacity, index, list } = this.state      if (opacity === 0) {        // 当透明度为0时候开始显示在一个文本        if (index + 2 > list.length) {          // 当前显示的文本为最后一个时 重头再来          this.setState({            nowText: list[0].title,            index: 0,          })        } else {          this.setState({            nowText: list[index + 1].title, // 下一个文本            index: index + 1,          })        }        this.onAppear() // 显示        clearInterval(this.timer1)        return      }      this.setState({        opacity: parseFloat(Math.abs(opacity - 0.04).toFixed(2)),      })    }, 20)  };  onAppear = () => {    this.timer2 = setInterval(() => {      const { opacity } = this.state      if (opacity === 1) {        clearInterval(this.timer2)        return      }      this.setState({        opacity: parseFloat(Math.abs(opacity + 0.04).toFixed(2)),      })    }, 20)  };  render() {    const { nowText, opacity, list, index } = this.state    return (      <View style={{ borderWidth: 1, margin: 10, padding: 5, borderColor: "#dddddd" }}>        <TouchableOpacity activeOpacity={0.75} onPress={() => {console.log(list[index].address)}}>          <View style={{ width: "80%" }}>            <Text              style={{                opacity,                fontSize: 14,              }}            >              {nowText}            </Text>          </View>        </TouchableOpacity>      </View>    )  }}

const tProps = {      list: [        { id: 1, title: "不是这件事很难，而是每件事都难", address: 1 },        { id: 2, title: "稳食姐，犯法啊", address: 2 },        { id: 3, title: "夜半诉心声，何须太高清", address: 3 },        { id: 4, title: "失恋唱情歌，即是漏煤气关窗", address: 4 },      ],    }...<TextLantern {...tProps} />