react-native Animated, 旋转动画

Animated 仅封装了四个可以动画化的组件：

　　View、Text、Image、ScrollView

可以使用 Animated.createAnimatedComponent()来封装你自己的组件。

下面是使用 Image 旋转的例子

import React, {Component} from 'react';
import { StyleSheet, View, Animated, Easing } from 'react-native';

const circle = require('../../resources/img/loginCircle.png');
class Index extends Component {
    constructor(props) {
        super(props);
        this.spinValue = new Animated.Value()
        this.state = {
        };
    }
    componentDidMount(){
        this.spin();
    }
    //旋转方法
    spin = () => {
        this.spinValue.setValue()
        Animated.timing(this.spinValue,{
          toValue: , // 最终值 为1，这里表示最大旋转 360度
          duration: ,
          easing: Easing.linear
       }).start(() => this.spin())
    }
    render() {
        const { user, pwd, fadeAnim} = this.state;
        //映射 0-1的值 映射 成 0 - 360 度
        const spin = this.spinValue.interpolate({
            inputRange: [, ],//输入值
            outputRange: ['0deg', '360deg'] //输出值
          })
        return(
            <View style={styles.container}>
                    <Animated.Image style={[styles.circle,{transform:[{rotate: spin }]}]} source={circle}/>
            </View>
        );
    }
}
const styles = StyleSheet.create({
    container:{
        flex:,
        alignItems:'center',
        justifyContent:'center',
        backgroundColor:'#00a0e4'
    },
    circle:{
        position:'absolute',
        width: ,
        height:
    }
});
export default Index;

https://reactnative.cn/docs/0.50/animations.html#content