(4)-新建项目
最后更新于：2022-04-01 06:49:54
## 源码
~~~
/**
* Sample React Native App
* https://github.com/facebook/react-native
*/
'use strict';
var React = require('react-native');
var {
AppRegistry,
StyleSheet,
Text,
View,
} = React;
var helloworld = React.createClass({
render: function() {
return (
<View style={styles.container}>
<Text style={styles.welcome}>
Welcome to React Native!
</Text>
<Text style={styles.instructions}>
To get started, edit index.ios.js
</Text>
<Text style={styles.instructions}>
Press Cmd+R to reload,{'\n'}
Cmd+D or shake for dev menu
</Text>
</View>
);
}
});
var styles = StyleSheet.create({
container: {
flex: 1,
justifyContent: 'center',
alignItems: 'center',
backgroundColor: '#F5FCFF',
},
welcome: {
fontSize: 20,
textAlign: 'center',
margin: 10,
},
instructions: {
textAlign: 'center',
color: '#333333',
marginBottom: 5,
},
});
AppRegistry.registerComponent('hellowrold',() => helloworld);
~~~
## 问题
`AppRegistry.registerComponent('hellowrold',() => helloworld);`中`registerComponent`方法的第一个参数`hellowrold`参数一定要跟项目名一样，否则就会报错。
## 总结
新建项目分5步：
## 引入react-native
~~~
var React = require('react-native');
~~~
## 定义组件
~~~
var {
AppRegistry,
StyleSheet,
Text,
View,
} = React;
~~~
## 定义界面控件
~~~
var helloworld = React.createClass({});
~~~
## 定义控件样式
~~~
var styles = StyleSheet.create({});
~~~
## 为项目注册界面
~~~
AppRegistry.registerComponent('项目名',() =>界面);
~~~