使用RN Animated做一个“添加购物车”动画的方法

import React from 'react';

import {
 StyleSheet,
 View,
 Image,
 Animated
} from 'react-native';

export default class SeatDroppingextends React.PureComponent{
 constructor (props) {
  super(props);
  this.state = {
   animValue: new Animated.Value(0),
   fromPageX: props.clickedPosition.x, // from event.nativeEvent.changedTouches[0]
   fromPageY: props.clickedPosition.y,
   toPageX: props.psgPosition.x,
   toPageY: props.psgPosition.y
  };
 }
 ponentDidMount() {
  Animated.timing(
   this.state.animValue,
   {
    toValue: 1,
    duration: 600
   }
  ).start();
 }
 render () {
  const {
   animValue,
   fromPageX,
   fromPageY,
   toPageX,
   toPageY
  } = this.state;
  return (
   <Animated.View
    style={{
     zIndex: 9,
     position: 'absolute',
     opacity: animValue.interpolate({
      inputRange: [0, 1],
      outputRange: [1, 0]
     }),
     transform: [
      {
       translateX: animValue.interpolate({
        inputRange: [0, 1],
        outputRange: [`${fromPageX}px`, `${toPageX}px`]
       })
      },
      {
       translateY: animValue.interpolate({
        inputRange: [0, 1],
        outputRange: [`${fromPageY}px`, `${toPageY}px`]
       })
      },
      {
       rotateZ: animValue.interpolate({
        inputRange: [0, 1],
        outputRange: ['0deg', '180deg']
       })
      },
      {
       scale: animValue.interpolate({
        inputRange: [0, 1],
        outputRange: [1, 0]
       })
      }
     ]}}
   >
    <Image
     source={require('../img/ic_seat_focus.png')}
     style={[
      {
       width: 36,
       height: 32,
       zIndex: 9
      }
     ]}
    />
   </Animated.View>
  );
 }
}