这是一个非常简洁的解决方案,它使用滚动视图的内容高度来滚动整个视图(安装时)。但是,可以使用相同的技巧(将侦听器添加到动画值)来创建滚动函数,该函数可以在任何给定时刻(到任何给定值)由某个事件触发。
import { useEffect, useRef, useState } from 'react'
import { Animated, Easing, ScrollView } from 'react-native'
const SlowAutoScroller = ({ children }) => {
const scrollRef = useRef()
const scrollAnimation = useRef(new Animated.Value(0))
const [contentHeight, setContentHeight] = useState(0)
useEffect(() => {
scrollAnimation.current.addListener((animation) => {
scrollRef.current &&
scrollRef.current.scrollTo({
y: animation.value,
animated: false,
})
})
if (contentHeight) {
Animated.timing(scrollAnimation.current, {
toValue: contentHeight,
duration: contentHeight * 100,
useNativeDriver: true,
easing: Easing.linear,
}).start()
}
return () => scrollAnimation.current.removeAllListeners()
}, [contentHeight])
return (
<Animated.ScrollView
ref={scrollRef}
onContentSizeChange={(width, height) => {
setContentHeight(height)
}}
onScrollBeginDrag={() => scrollAnimation.current.stopAnimation()}
>
{children}
</Animated.ScrollView>
)
}