├── LICENSE ├── README.md ├── index.js ├── scroll-vertical.gif └── scrollVertical.js /LICENSE: -------------------------------------------------------------------------------- 1 | MIT License 2 | 3 | Copyright (c) 2018 QuietNight 4 | 5 | Permission is hereby granted, free of charge, to any person obtaining a copy 6 | of this software and associated documentation files (the "Software"), to deal 7 | in the Software without restriction, including without limitation the rights 8 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 9 | copies of the Software, and to permit persons to whom the Software is 10 | furnished to do so, subject to the following conditions: 11 | 12 | The above copyright notice and this permission notice shall be included in all 13 | copies or substantial portions of the Software. 14 | 15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 18 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 20 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 21 | SOFTWARE. 22 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # react-native-scrollVertical 2 | 纯JavaScript实现仿京东app首页 京东快报 上下滚屏效果 3 | 4 | ![image](https://github.com/accforgit/react-native-scrollVertical/blob/master/scroll-vertical.gif) 5 | 6 | ### Installation 7 | ``` 8 | npm install --save https://github.com/accforgit/react-native-scrollVertical.git 9 | ``` 10 | 11 | ### Basic Usage 12 | ``` 13 | import React, { Component } from 'react' 14 | 15 | import ScrollVertical from './scrollVertical' 16 | 17 | export default class Index extends Component { 18 | constructor(props) { 19 | super(props) 20 | } 21 | 22 | render() { 23 | // 测试数据 24 | let data = [] 25 | for(let i=4; i--; ) { 26 | data.push({content: 'animatedScroll ' + i}) 27 | } 28 | return ( 29 | 36 | ) 37 | } 38 | } 39 | ``` 40 | ### Properties 41 | 42 | |Props|Default|Type|Description| 43 | |---|---|---|---| 44 | |data|[]|array(object{content})|上下滚屏的数据条目| 45 | |delay|500|number|每一次滚动切换之前延迟的时间，单位为 ms| 46 | |duration|500|number|每一次滚动切换的持续时间，单位为 ms| 47 | |scrollHeight|32|number|滚屏高度| 48 | |scrollStyle|null|style|滚屏样式| 49 | |textStyle|null|style|滚屏文字样式| 50 | -------------------------------------------------------------------------------- /index.js: -------------------------------------------------------------------------------- 1 | import React, { Component } from 'react' 2 | 3 | import ScrollVertical from './scrollVertical' 4 | 5 | export default class Index extends Component { 6 | constructor(props) { 7 | super(props) 8 | } 9 | 10 | render() { 11 | // 测试数据 12 | let data = [] 13 | for(let i=4; i--; ) { 14 | data.push({content: 'animatedScroll ' + i}) 15 | } 16 | return ( 17 | 24 | ) 25 | } 26 | } 27 | -------------------------------------------------------------------------------- /scroll-vertical.gif: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/accforgit/react-native-scrollVertical/b74dc0d16b3b1fb7d49d66594556ce235b755963/scroll-vertical.gif -------------------------------------------------------------------------------- /scrollVertical.js: -------------------------------------------------------------------------------- 1 | import React, { Component } from 'react' 2 | import { 3 | Text, 4 | View, 5 | Animated, 6 | Easing, 7 | StyleSheet, 8 | } from 'react-native' 9 | 10 | export default class ScrollVertical extends Component { 11 | constructor(props) { 12 | super(props) 13 | this.state ={ 14 | translateValue: new Animated.ValueXY({x:0, y:0}), 15 | // 滚屏高度 16 | scrollHeight: this.props.scrollHeight || 32, 17 | // 滚屏内容 18 | kb_content: [], 19 | // Animated.View 滚动到的 y轴坐标 20 | kb_tempValue: 0, 21 | // 最大偏移量 22 | kb_contentOffsetY: 0, 23 | // 每一次滚动切换之前延迟的时间 24 | delay: this.props.delay || 500, 25 | // 每一次滚动切换的持续时间 26 | duration: this.props.duration || 500 27 | } 28 | } 29 | render() { 30 | return ( 31 | 32 | { 33 | this.state.kb_content.length !==0 ? 34 | 41 | {this.state.kb_content.map(this._createKbItem.bind(this))} 42 | : null 43 | } 44 | 45 | ) 46 | } 47 | 48 | componentDidMount() { 49 | let content = this.props.data || [] 50 | if(content.length !== 0) { 51 | let h = (content.length+1) * this.state.scrollHeight 52 | this.setState({ 53 | kb_content: content.concat(content[0]), 54 | kb_contentOffsetY: h 55 | }) 56 | 57 | // 开始动画 58 | this._startAnimation() 59 | } 60 | } 61 | 62 | _createKbItem(kbItem, index) { 63 | return ( 64 | 66 | {kbItem.content} 67 | 68 | ) 69 | } 70 | 71 | _startAnimation() { 72 | this.state.kb_tempValue -= this.state.scrollHeight 73 | Animated.sequence([ 74 | Animated.delay(this.state.delay), 75 | Animated.timing( 76 | this.state.translateValue, 77 | { 78 | toValue:{x:0,y:this.state.kb_tempValue}, 79 | duration: this.state.duration, // 动画持续的时间（单位是毫秒），默认为500 80 | easing: Easing.linear 81 | } 82 | ), 83 | ]) 84 | .start(()=>{ 85 | // 无缝切换 86 | if(this.state.kb_tempValue-this.state.scrollHeight === -this.state.kb_contentOffsetY) { 87 | // 快速拉回到初始状态 88 | this.state.translateValue.setValue({x:0,y:0}) 89 | this.state.kb_tempValue = 0 90 | } 91 | this._startAnimation() 92 | }) 93 | } 94 | } 95 | 96 | const styles = StyleSheet.create({ 97 | kbContainer:{ 98 | // 必须要有一个背景或者一个border，否则本身高度将不起作用 99 | backgroundColor:'transparent' 100 | }, 101 | kb_text_c:{ 102 | fontSize: 18, 103 | color:'#181818', 104 | } 105 | }) --------------------------------------------------------------------------------