如何在React Native中解析动画值？

Question

我想解析 中显示的值。
我只想要整数值而不是小数值。

我明白了：

我想要那个：

我尝试使用：

<Animated.Text>{Number.parseInt(milliliters.ml)}</Animated.Text>

但是我收到错误，它不起作用。

我在线运行的示例：
https://snack.expo.dev/@danilobatistaqueiroz/parsing_animated_values

如果有其他此类动画的库，对于我的情况就足够了。

我的代码：

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

export default function Milliliters() {

  const ML_LEVELS = [240,50,190];
  this.ml = React.useRef(new Animated.Value(ML_LEVELS[0])).current;

  this.ml_up_down = ()=>{
    Animated.sequence([
      Animated.timing(this.ml, {
        duration: 2000,
        toValue: ML_LEVELS[1],
        easing: Easing.bezier(.55,.5,.45,.5),
        useNativeDriver: false,
        delay: 0,
      }),
      Animated.timing(this.ml, {
        duration: 2000,
        toValue: ML_LEVELS[2],
        easing: Easing.ease,
        useNativeDriver: false,
        delay: 0,
      }),
    ]).start();
  }

}

import Milliliters from './milliliters';

import React from 'react';
import { Animated, Text } from 'react-native';

export default AddDrink = () => {

 const milliliters = React.useRef(new Milliliters()).current;

 React.useEffect(() => {
   milliliters.ml_up_down();
 });

 return (
   <Animated.Text>{milliliters.ml}</Animated.Text>
 );

}

Answer 1

 import React, { useRef, useState, useEffect } from "react";
 import { Animated, Easing, Text, View } from "react-native";

 export default function AddDrink() {
   const ML_LEVELS = [240, 50, 190];
   const ml = useRef(new Animated.Value(ML_LEVELS[0])).current;

   const [displayValue, setDisplayValue] = useState(ML_LEVELS[0]);

   useEffect(() => {
     // Update value of `displayValue` when `ml` changes
     const id = ml.addListener(({ value }) => {
       setDisplayValue(Math.round(value)); // Round the value to integer
     });

     return () => {
       ml.removeListener(id);
     };
   }, [ml]);

   const ml_up_down = () => {
     Animated.sequence([
       Animated.timing(ml, {
         duration: 2000,
         toValue: ML_LEVELS[1],
         easing: Easing.bezier(0.55, 0.5, 0.45, 0.5),
         useNativeDriver: false,
       }),
       Animated.timing(ml, {
         duration: 2000,
         toValue: ML_LEVELS[2],
         easing: Easing.ease,
         useNativeDriver: false,
       }),
     ]).start();
   };

   useEffect(() => {
     ml_up_down();
   }, []);

   return (
     <View>
       <Animated.Text>{displayValue}</Animated.Text>
     </View>
   );
      }