ReactNative：如何中心文本？

问题描述

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如何在ReactNative中横向和纵向放置文本？

我在rnplay.org中有一个示例应用程序，其中 justifyContent =center和 alignItems =center不工作：

文本应该居中。
为什么文本（黄色）和父容器之间的顶部有一个边距？

代码：

  
来自标题'style remove  height ， justifyContent 和 alignItems 。它将垂直居中文本。添加 textAlign：'center'，它将水平居中文本。 
 
 
 标题：{
 textAlign：'center'，//<  -  magic 
 fontWeight：'bold'，
 fontSize：18，
 marginTop：0，
 width：200，
 backgroundColor：'yellow'，
} 
  
 
How to center Text in ReactNative both in horizontal and vertical? 
I have an example application in rnplay.org where justifyContent="center" and alignItems="center" is not working:https://rnplay.org/apps/AoxNKQ
The text should being centered.And why is there a margin at the top between the text (yellow) and parent container?
Code:
'use strict';

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

var SampleApp = React.createClass({
  render: function() {
    return (
            <View style={styles.container}>
                <View style={styles.topBox}>
                    <Text style={styles.headline}>lorem ipsum{'\n'}ipsum lorem lorem</Text>

                </View>
                <View style={styles.otherContainer}>
                </View>
            </View>
    );
  }
});

var styles = StyleSheet.create({

    container: {
        flex: 1,
        flexDirection: 'column',
        backgroundColor: 'red',
        justifyContent: 'center',
        alignItems: 'center',
    },

    topBox: {
        flex: 1,
        flexDirection: 'row',
        backgroundColor: 'lightgray',
        justifyContent: 'center',
        alignItems: 'center',
    },
    headline: {
        fontWeight: 'bold',
        fontSize: 18,
    marginTop: 0,
        width: 200,
        height: 80,
    backgroundColor: 'yellow',
        justifyContent: 'center',
        alignItems: 'center',
    },

  otherContainer: {
        flex: 4,
        justifyContent: 'center',
        alignItems: 'center',
    backgroundColor: 'green',
    },


});

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

module.exports = SampleApp;
 解决方案 
From headline' style remove height, justifyContent and alignItems. It will center the text vertically. Add textAlign: 'center' and it will center the text horizontally.
  headline: {
    textAlign: 'center', // <-- the magic
    fontWeight: 'bold',
    fontSize: 18,
    marginTop: 0,
    width: 200,
    backgroundColor: 'yellow',
  }
                        
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