好吧，離開這個答案React native - “this.setState is not a function”試圖為背景顏色設置動畫？我只是想在 React Native 中循環淡化視圖的背景顏色。export default props => {  let [fontsLoaded] = useFonts({    'Inter-SemiBoldItalic': 'https://rsms.me/inter/font-files/Inter-SemiBoldItalic.otf?v=3.12',        'SequelSans-RomanDisp' : require('./assets/fonts/SequelSans-RomanDisp.ttf'),        'SequelSans-BoldDisp' : require('./assets/fonts/SequelSans-BoldDisp.ttf'),        'SequelSans-BlackDisp' : require('./assets/fonts/SequelSans-BlackDisp.ttf'),  });  //Set states and hooks  //To change state 'color' - setColor('#ff0000');  const colors = ["#fff", "#ff0000", "#00ff00", "#0000ff", "#0077ff"];  const [color, setColor] = useState("#fff");  const [backgroundColor, setBackgroundColor] = useState(new Animated.Value(0));  const [time, setTime] = useState(0);  //const t = colors[randNum(0, colors.length)];  //random num, exclusive  function randNum(min, max) {    return Math.floor(min + Math.random() * (max - min));  }  useEffect(() => {    setBackgroundColor(new Animated.Value(0));  }, []); // this will be only called on initial mounting of component,  // so you can change this as your requirement maybe move this in a function which will be called,  // you can't directly call setState/useState in render otherwise it will go in a infinite loop.  useEffect(() => {    Animated.timing(backgroundColor, {      toValue: 100,      duration: 5000    }).start();  }, [backgroundColor]);  var bgColor = this.state.color.interpolate({    inputRange: [0, 300],    outputRange: ["rgba(255, 0, 0, 1)", "rgba(0, 255, 0, 1)"]  });  useEffect(() => {    const interval = setInterval(() => {      //setTime(new Date().getMilliseconds());      setColor("#ff0000");    }, 36000);    return () => clearInterval(interval);  }, []);有了這個，一切都會檢查出來，除了var bgColor = this.state.color會產生錯誤undefined 不是評估的對象..我不明白為什么這是一個問題，因為我將顏色設置為useState('#fff')我想color在我的樣式表中使用為backgroundColor.如何正確設置？