ReactNative实现的横向滑动条效果
更新时间:2024年02月05日 11:29:04 作者:xvzhengyang
本文介绍了ReactNative实现的横向滑动条效果,本文结合示例代码给大家介绍的非常详细,补充介绍了ReactNative基于宽度变化实现的动画效果,感兴趣的朋友跟随小编一起看看吧
ReactNative实现的横向滑动条
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OK,我们先看下效果图
注意使用到了两个库
1.react-native-linear-gradient
2.react-native-gesture-handler
ok,我们看下面的代码
import {Image, TouchableWithoutFeedback, StyleSheet, View} from 'react-native'; import LinearGradient from 'react-native-linear-gradient'; import React from 'react'; import { Gesture, GestureDetector, GestureHandlerRootView, } from 'react-native-gesture-handler'; export class HorizntalSlider extends React.Component { shouldComponentUpdate( nextProps: Readonly<P>, nextState: Readonly<S>, nextContext: any, ): boolean { return false; } constructor(props) { super(props); this.progress = props.initValue; this.step = props.step; this.range = props.max - props.min; this.currentX = 0; this.enable = true; } _setValueChange(value) { this.currentX = value; this.selectedTrack.setNativeProps({ style: {width: value}, }); let indicatorValue = value - 5 > 0 ? value - 5 : 0; this.indicator.setNativeProps({ style: {left: indicatorValue - 1}, }); } componentDidMount(): void { if (this.props) { this.setPowerState(this.props.openState); } } _add() { if (!this.enable) { showToast(this.tips); const {onEnableClick} = this.props; if (onEnableClick) { onEnableClick(); } return; } let tempValue = this.progress + this.step; this.progress = tempValue > this.props.max ? this.props.max : tempValue; let styleValue = ((this.progress - this.props.min) / this.range) * 250; this._setValueChange(styleValue); const {onLastChange, onChange} = this.props; onChange(this.progress); onLastChange(this.progress); } _reduce() { if (!this.enable) { const {onEnableClick} = this.props; if (onEnableClick) { onEnableClick(); } showToast(this.tips); return; } let tempValue = this.progress - this.step; this.progress = tempValue < this.props.min ? this.props.min : tempValue; let styleValue = ((this.progress - this.props.min) / this.range) * 250; this._setValueChange(styleValue); const {onLastChange, onChange} = this.props; onChange(this.progress); onLastChange(this.progress); } _onValueChange(x, isFinalize = false) { if (x > 250) { x = 250; } if (x < 0) { x = 0; } this.currentX = x; this.progress = this.props.min + parseInt((x / 250) * this.range); // if (isFinalize) { // const {onLastChange} = this.props; // onLastChange(this.progress); // } else { // const {onChange} = this.props; // onChange(this.progress); // } this._setValueChange(x); } setPowerState(state) { if (!this.props) { return; } if (state === 1) { this.selectedTrack.setNativeProps({ style: { width: this.currentX, }, }); this.indicator.setNativeProps({ style: {opacity: 1}, }); } else { this.selectedTrack.setNativeProps({ style: {width: 0}, }); this.indicator.setNativeProps({ style: {opacity: 0}, }); } } setEnable(isEnable, tips) { if (!this.props) { return; } this.enable = isEnable; this.tips = tips; } gesture = Gesture.Pan() .onBegin(e => { this._onValueChange(e.x); }) .onUpdate(e => { this._onValueChange(e.x); }) .onFinalize(e => { this._onValueChange(e.x, true); }); render() { this.currentX = ((this.progress - this.props.min) / this.range) * 250; this.currentX = this.currentX > 0 ? this.currentX : 0; return ( <View style={[styles.mainContainer, this.props.style]}> <GestureHandlerRootView> <GestureDetector gesture={this.gesture}> <View style={styles.sliderContainer}> <LinearGradient start={{x: 0, y: 0}} end={{x: 1, y: 0}} colors={['#4372FF', 'white', '#FF4D4F']} style={{ width: 252, height: 60, }} /> <View style={{ flexDirection: 'row', alignItems: 'center', position: 'absolute', }}> <View ref={c => (this.selectedTrack = c)} style={{ width: this.currentX, opacity: 0, height: 60, }} /> <View style={{ flex: 1, backgroundColor: '#12161a', opacity: 0.8, height: 60, }} /> </View> <View ref={c => (this.indicator = c)} style={[styles.indicator, {left: this.currentX - 7}]} /> </View> </GestureDetector> </GestureHandlerRootView> </View> ); } } class Track extends React.Component { constructor(props) { super(props); this.unitViewArr = []; for (let i = 0; i < 42; i++) { this.unitViewArr[i] = i; } } shouldComponentUpdate( nextProps: Readonly<P>, nextState: Readonly<S>, nextContext: any, ): boolean { return false; } render() { return ( <View style={styles.trackContainer}> {this.unitViewArr.map((item, index) => { return ( <View key={index} style={{flexDirection: 'row', alignItems: 'center'}}> <View style={{ height: 60, width: 2, opacity: 0, backgroundColor: '#12161a', borderRadius: 100, }} /> <View style={{height: 60, width: 4, backgroundColor: '#12161a'}} /> </View> ); })} </View> ); } } const styles = StyleSheet.create({ mainContainer: { flexDirection: 'row', justifyContent: 'center', alignItems: 'center', }, sliderContainer: { position: 'relative', justifyContent: 'center', paddingVertical: 10, marginLeft: 10, marginRight: 8, }, trackContainer: { width: 252, flexDirection: 'row', position: 'absolute', }, actionImg: { width: 60, height: 60, }, thumb: { height: 34, width: 7, backgroundColor: 'transparent', }, indicator: { width: 0, height: 0, position: 'absolute', top: -2, borderLeftWidth: 4, borderTopWidth: 4, borderRightWidth: 4, left: -3, borderTopColor: '#FF6A6B', borderLeftColor: 'transparent', borderRightColor: 'transparent', }, }); export default HorizntalSlider;
使用代码如下
<GestureHandlerHorizntalSlider model={{ initValue: 20, step: 10, max: 100, min: 0, }}> </GestureHandlerHorizntalSlider>
拖动条:max(最大值),min(最小值),initValue(当前值),step(步调)
补充:
ReactNative基于宽度变化实现的动画效果
效果如上图所示,通过修改设备宽度实现动画效果
import React, {useRef, useEffect, useState} from 'react'; import {Animated, Text, View, Image} from 'react-native'; const FadeInView = props => { const fadeAnim = useRef(new Animated.Value(0)).current; React.useEffect(() => { Animated.timing( fadeAnim, // 动画中的变量值 { toValue: props.currentWidth, // duration: props.durationTime, // 让动画持续一段时间 // Style property 'width' is not supported by native animated module useNativeDriver: false, }, ).start(); // 开始执行动画 }, [props.currentWidth]); return ( <Animated.View // 使用专门的可动画化的View组件 style={{ ...props.style, width: fadeAnim, // 将宽度绑定到动画变量值 }}> </Animated.View> ); }; // 然后你就可以在组件中像使用`View`那样去使用`FadeInView`了 export default props => { return ( <FadeInView durationTime={props.durationTime} currentWidth={props.currentWidth} style={{height: 310, backgroundColor: 'pink'}}></FadeInView> ); };
使用的代码如下
<LayoutAnimatedWidth currentWidth={this.state.currentWidth} durationTime={this.state.durationTime}> </LayoutAnimatedWidth>
PS:注意上面的代码和截图不一致;但是代码是可以实现上面的效果的。
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