我拼湊了一個Microsoft Excel的工作版本,如「凍結疼痛」視圖。列標題水平滾動內容,行標題與內容垂直滾動,但當滾動另一個時,每個「卡住」位置。React Native粘性行和標題滾動性能?
You can try the working version here.
這不是最佳的,因爲它停止了一個輕彈的滾動或只是輕掃許多口吃。
該方法使用了一些技巧,但導致問題的方法是同步滾動視圖。
As outlined here,我試過設置useNativeDriver: true
,這需要改變
ScrollView
到Animated.ScrollView
和
ref={ref => (this.instance = ref)}
到ref={ref => (this.instance = ref._component)}
但隨後同步進入完全失控。
我喜歡更理想的方法。這怎麼能改進?
import React from 'react';
import { ScrollView, Animated, Text, View } from 'react-native';
export default class SyncScrollTest extends React.Component {
constructor() {
super();
this.scrollPosition = new Animated.Value(0);
this.scrollEvent = Animated.event(
[{ nativeEvent: { contentOffset: { y: this.scrollPosition } } }],
{ useNativeDriver: false },
);
}
render() {
return (
<View style={{ flex: 1 }}>
<View style={{ flexDirection: 'row' }}>
<ScrollViewVerticallySynced
style={{ width: 50, marginTop: 60 }}
name="C1"
color="#F2AFAD"
onScroll={this.scrollEvent}
scrollPosition={this.scrollPosition}
/>
<ScrollView horizontal bounces={false}>
<View style={{ width: 600 }}>
<View style={{ height: 60, justifyContent: 'center', backgroundColor: '#B8D2EC' }}>
<Text>
I am Column Header!! I am Column Header!! I am Column Header!! I am Column
Header!! I am Column Header!! I am Column Header!! I am Column Header!!
</Text>
</View>
<ScrollViewVerticallySynced
style={{ width: 600 }}
name="C2"
color="#D9E4AA"
onScroll={this.scrollEvent}
scrollPosition={this.scrollPosition}
/>
</View>
</ScrollView>
</View>
</View>
);
}
}
class ScrollViewVerticallySynced extends React.Component {
componentDidMount() {
this.listener = this.props.scrollPosition.addListener((position) => {
this.instance.scrollTo({
y: position.value,
animated: false,
});
});
}
render() {
const { name, color, style, onScroll } = this.props;
return (
<ScrollView
key={name}
ref={ref => (this.instance = ref)}
style={style}
scrollEventThrottle={1}
onScroll={onScroll}
bounces={false}
showsVerticalScrollIndicator={false}
>
{someRows(name, 25, color)}
</ScrollView>
);
}
}
const someRows = (name, rowCount, color) =>
Array.from(Array(rowCount).keys()).map(index =>
(<View
key={`${name}-${index}`}
style={{
height: 50,
backgroundColor: index % 2 === 0 ? color : 'white',
flex: 1,
alignItems: 'center',
justifyContent: 'center',
}}
>
<Text>
{name} R{index + 1}
</Text>
</View>),
);
```
你的代碼運行平穩的設備,但不是在模擬器。你碰巧搞清楚了嗎?我試圖完成同樣的事情,沒有運氣。 – teggy