react-native scrollview 不滚动

Question

我似乎不明白为什么我的 Android 应用程序中的屏幕在 Android 模拟器中根本不滚动。这是我的代码：

import React, { Component } from 'react';
import Dimensions from 'Dimensions';

import {
  Text,
  ScrollView,
  View,
  TouchableHighlight,
  StyleSheet
} from 'react-native';


const win = Dimensions.get('window');

class DeficiencyItem extends Component {

    render() {
        const touchable = {
                width:win.width/2-20,
                height:230,
                backgroundColor:'red',
              };
        return (
            <TouchableHighlight style={touchable}>
                <View>
                    <Text>Item Here</Text>
                </View>
            </TouchableHighlight>
        );
  }
}

export default class Items extends Component {
  static navigationOptions = {title:'hey'};

    constructor(props)
    {
        super(props);
    }

    render() {

        let deficiencies = [];
        for(let x = 0; x<12;x++)
        {
            let row = <DeficiencyItem key={x} />;
            deficiencies.push(row);
        }
        return (
            <View style={{flex:1}}>
              <ScrollView style={{
                margin:5,
                flexWrap: 'wrap',
                flexDirection:'row',
              }}>
               {deficiencies}
              </ScrollView>
            </View>
        );
  }
}

有些项目超出了视口的下限。但是在模拟器中触摸拖动滚动没有任何作用。我做错了什么？

Answer 1

如果 scrollview 之外没有视图，则删除 View 元素并将 flex:1 添加到 scrollview。

滚动视图应该是父视图，

<ScrollView style={styles.container}>
  <View style={{flex:1}}>
    {deficiencies}
  </View>
</ScrollView>

container: {
    flex: 1,
  }

Answer 2

我的 ScrollView 嵌套在另外两个视图中。通过为滚动视图提供高度解决了该问题。在 iOS 上没有必要，因此，在添加 Platform 和 Dimensions 以响应原生导入后，我这样做：

 const { height } = Dimensions.get("screen");
 const styles = StyleSheet.create({
 scrollView: {
   // my outer views have flex:1 so no flex needed here
   alignItems: "center",
   justifyContent: "center", // or whatever you want
   width: "100%,
   height: Platform.OS === "android" ? height * 1.3 : height,
   // if it was just "height", there would be no extra space to scroll on android
 },

 // lots of other styles and stuff

 });

react-native scrollview 不滚动

react-native scrollview doesn't scroll

android

scrollview

react-native