背景圖像和scrollview上反應原生

Question

我正在使用react native建立一個應用程序，並希望獲得背景圖像和滾動視圖，它覆蓋在背景圖像之上，如雅虎天氣應用程序。

但我無法讓它發揮作用。

請幫忙。

Answer 1

要獲得此效果，您需要設置絕對定位的圖像，然后將ScrollView放在視圖的頂部：

'use strict';

var React = require('react-native');
var {
  AppRegistry,
  StyleSheet,
  Text,
  View,
  Dimensions,
  ScrollView,
  Image
} = React;

let width = Dimensions.get('window').width

var SampleApp = React.createClass({

  render: function() {
    return (
      <View style={{ flex:1, backgroundColor: 'transparent' }}>
        <View>
            <Image style={{ height: width, width: width, position: 'absolute', top:0, left:0 }} source={{ uri: 'http://i01.i.aliimg.com/wsphoto/v0/32297951629_5/5pcs-lot-The-Hollowan-Star-Nicolas-Cage-Stylish-Square-Pillowcase-Cushion-Pillow-Cover.jpg' }} />
        </View>
        <ScrollView style={{ flex:1 }}>
          <View>
            <Text>{ipsum}</Text>
          </View>
        </ScrollView>
      </View>
    );
  }
});

var styles = StyleSheet.create({
  container: {
    flex: 1,
    justifyContent: 'center',
    alignItems: 'center',
    backgroundColor: '#F5FCFF',
  },
  welcome: {
    fontSize: 28,
    textAlign: 'center',
    margin: 10,
  },
  instructions: {
    textAlign: 'center',
    color: '#333333',
    fontSize: 19,
    marginBottom: 5,
  },
});

AppRegistry.registerComponent('SampleApp', () => SampleApp);

let ipsum = "Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum."