React Native【实战范例】弹跳动画菜单导航

最终效果

范例代码

import React, { useEffect, useRef, useState } from "react";
import {Animated,Easing,StyleSheet,Text,TouchableOpacity,View,
} from "react-native";
export default function Demo() {const width1 = useRef(new Animated.Value(200)).current;const width2 = useRef(new Animated.Value(64)).current;const width3 = useRef(new Animated.Value(64)).current;const width4 = useRef(new Animated.Value(64)).current;const [index, setIndex] = useState(0);useEffect(() => {anim1(index === 0);anim2(index === 1);anim3(index === 2);anim4(index === 3);}, [index]);const anim1 = (isOpen) => {Animated.timing(width1, {toValue: isOpen ? 200 : 64,duration: isOpen ? 500 : 300,easing: isOpen ? Easing.elastic(3) : Easing.ease,useNativeDriver: false,}).start();};const anim2 = (isOpen) => {Animated.timing(width2, {toValue: isOpen ? 200 : 64,duration: isOpen ? 500 : 300,easing: isOpen ? Easing.elastic(3) : Easing.ease,useNativeDriver: false,}).start();};const anim3 = (isOpen) => {Animated.timing(width3, {toValue: isOpen ? 200 : 64,duration: isOpen ? 500 : 300,easing: isOpen ? Easing.elastic(3) : Easing.ease,useNativeDriver: false,}).start();};const anim4 = (isOpen) => {Animated.timing(width4, {toValue: isOpen ? 200 : 64,duration: isOpen ? 500 : 300,easing: isOpen ? Easing.elastic(3) : Easing.ease,useNativeDriver: false,}).start();};return (<View style={styles.root}><TouchableOpacityactiveOpacity={0.8}onPress={() => {setIndex(0);}}><Animated.Viewstyle={[styles.view,{ width: width1, opacity: index === 0 ? 1 : 0.75 },]}><Text style={styles.txt} numberOfLines={1} ellipsizeMode="clip">首页推荐</Text><View style={styles.dot} /></Animated.View></TouchableOpacity><TouchableOpacityactiveOpacity={0.8}onPress={() => {setIndex(1);}}><Animated.Viewstyle={[styles.view,{ width: width2, opacity: index === 1 ? 1 : 0.75 },]}><Text style={styles.txt} numberOfLines={1} ellipsizeMode="clip">热门直播</Text><View style={styles.dot} /></Animated.View></TouchableOpacity><TouchableOpacityactiveOpacity={0.8}onPress={() => {setIndex(2);}}><Animated.Viewstyle={[styles.view,{ width: width3, opacity: index === 2 ? 1 : 0.75 },]}><Text style={styles.txt} numberOfLines={1} ellipsizeMode="clip">我的礼物</Text><View style={styles.dot} /></Animated.View></TouchableOpacity><TouchableOpacityactiveOpacity={0.8}onPress={() => {setIndex(3);}}><Animated.Viewstyle={[styles.view,{ width: width4, opacity: index === 3 ? 1 : 0.75 },]}><Text style={styles.txt} numberOfLines={1} ellipsizeMode="clip">个人信息</Text><View style={styles.dot} /></Animated.View></TouchableOpacity></View>);
}
const styles = StyleSheet.create({root: {width: "100%",height: "100%",backgroundColor: "white",flexDirection: "column",justifyContent: "center",},view: {height: 60,flexDirection: "row",alignItems: "center",marginVertical: 16,borderTopRightRadius: 28,borderBottomRightRadius: 28,backgroundColor: "#2030ff",paddingLeft: 16,overflow: "hidden",},img: {width: 32,height: 32,tintColor: "white",},txt: {fontSize: 18,color: "#ffffffD0",marginLeft: 16,},dot: {width: 10,height: 10,backgroundColor: "#20f020",marginLeft: 28,borderRadius: 5,},
});