reactjs - 如何为一组组件创建一个动态的 React 钩子(Hook)数组

Question

const AnimatedText = Animated.createAnimatedComponent(Text);

function Component({ texts }) {
  const [visitIndex, setVisitIndex] = React.useState(0);

  // can't create an array of shared value for each text
  // since useSharedValue is a hook, and that throws a warning
  const textScalesShared = texts.map((_) => useSharedValue(1));

  // can't create an array of animated style for each text
  // since useAnimatedStyle is a hook, and that throws a warning
  const animatedTextStyle = textScalesShared.map((shared) =>
    useAnimatedStyle(() => ({
      transform: [{ scale: shared.value }],
    }))
  );

  useEffect(() => {
    // code to reduce text scale one after another
    // it will loop over the array of textScaleShared values
    // passed to each component and update it
    if (visitIndex === texts.length) {
      return;
    }

    textScalesShared[visitIndex].value = withDelay(
      1000,
      withTiming(0.5, {
        duration: 1000,
      })
    );

    const timerId = setTimeout(() => {
      setVisitIndex((idx) => idx + 1);
    }, 1000);

    return () => {
      clearTimeout(timerId);
    };
  }, [visitIndex]);

  return texts.map((text, index) => {
    if (index <= visitIndex) {
      return (
        <AnimatedRevealingText
          key={index}
          fontSize={fontSize}
          revealDuration={revealDuration}
          style={animatedStylesShared[index]}
          {...props}
        >
          {text}
        </AnimatedRevealingText>
      );
    } else {
      return null;
    }
  });
}

我想将动画样式应用于组件数组，但由于 useSharedValue和 useAnimatedStyle都是钩子(Hook)，我无法遍历 Prop 并为每个组件创建共享值和相应的样式。
我怎样才能达到同样的效果？
编辑:更新以添加完整代码。

Answer 1

您可以创建一个组件来处理 useSharedValue和 useAnimatedStyle 使用 visitIndex 对每个项目进行 Hook 值(value):
AnimatedTextItem.js

const AnimatedText = Animated.createAnimatedComponent(Text);

const AnimatedTextItem = ({text, visited}) => {
  const textScaleShared = useSharedValue(1);
  const style = useAnimatedStyle(() => ({
    transform: [{ textScaleShared.value }],
  }));

  useEffect(()=> {
    if(visited) {
      textScaleShared.value = withDelay(
        1000,
        withTiming(0.5, {
          duration: 1000,
        });
      );
    }
  }, [visited]);
  
  return (<AnimatedText style={style}>{text}</AnimatedText>)
}

组件.js

function Component({texts}) {
  const [visitIndex, setVisitIndex] = React.useState(0);

  useEffect(() => {
    // code to reduce text scale one after another
    // it will loop over the array of textScaleShared values
    // passed to each component and update it
    if (visitIndex === texts.length) {
      return;
    }

    const timerId = setTimeout(() => {
      setVisitIndex((idx) => idx + 1);
    }, revealDuration);

    return () => {
      clearTimeout(timerId);
    };
  }, []);
  return texts.map((text, index) => (<AnimatedTextItem text={text} visited={visitIndex === index}/>))
}