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  • [React Native] Animate Styles of a React Native View with Animated.timing

    In this lesson we will use Animated.timing to animate the opacity and height of a View in our React Native application. This function has attributes that you can set such as easing and duration.

    import React, {Component} from 'react';
    import {Text, View, StyleSheet, Image, Animated, Easing} from 'react-native';
    
    var styles = StyleSheet.create({
        container: {
            backgroundColor: '#48BBEC',
            paddingBottom: 10
        },
        name: {
            alignSelf: 'center',
            fontSize: 21,
            marginTop: 10,
            marginBottom: 5,
            color: 'white'
        },
        handle: {
            alignSelf: 'center',
            fontSize: 16,
            color: 'white'
        },
        image: {
            height: 125,
             125,
            borderRadius: 65,
            marginTop: 10,
            alignSelf: 'center'
        }
    });
    
    class Badge extends React.Component {
        constructor(props){
            super(props);
            this.state = {
                fadeAnim: new Animated.Value(0),
                bounceAnim: new Animated.Value(0)
            }
        }
        componentDidMount() {
            Animated.timing(
                this.state.fadeAnim,
                {toValue: 1, duration: 2000}
            ).start();
            Animated.timing(
                this.state.bounceAnim,
                {toValue: 1, duration: 2000, easing: Easing.bounce}
            ).start();
        }
        render(){
            const animatedTextStyle = {
                opacity: this.state.fadeAnim,
            };
            const animateImageStyle = {
                opacity: this.state.bounceAnim
            };
            return (
                <View style={styles.container}>
                    <Animated.Image style={[styles.image, animateImageStyle]} source={{uri: this.props.userInfo.avatar_url}}></Animated.Image>
                    <Animated.Text style={[styles.name,animatedTextStyle]}> {this.props.userInfo.name} </Animated.Text>
                    <Animated.Text style={[styles.handle, animatedTextStyle]}> {this.props.userInfo.login} </Animated.Text>
                </View>
            )
        }
    }
    
    /**
     * Make sure when when user the Badge component, the userInfo object is there
     * @type {{userInfo: *}}
     */
    Badge.propTypes = {
        userInfo: React.PropTypes.object.isRequired
    };
    
    module.exports=Badge;
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  • 原文地址:https://www.cnblogs.com/Answer1215/p/6195640.html
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