1.建立自定義CKButton.js元件類

 1 import React,{Component} from 'react';
 2 import {
 3     View,
 4     StyleSheet,
 5     Button,
 6     TouchableOpacity,
 7     Text
 8 } from 'react-native';
 9 
10 export default class CKButton extends Component{
11     constructor(){
12         super();
13     }
14     render(){
 
15         return(
16             <View style={{justifyContent:'center',alignItems:'center'}}>
17                 <Button 
18                 title="登入" 
19                 onPress={()=>this._onBtnPress()}
20                 color="red"
21                 />
22                 <TouchableOpacity
 
23                     style={styles.btnStyle}
24                     activeOpacity={0.6}
25                     onPress={()=>this._onBtnPress()}
26                     onPressIn={()=>this._onBtnPress()}//按下按鈕事件
27                     onPressOut={()=>this._onBtnPress()}//抬起按鈕事件
28                     onLongPress={()=>this
 
._onBtnPress()}//長按按鈕事件
29                 >
30                     <Text style={{fontSize:25,color:'green'}}>註冊賬號</Text>
31                 </TouchableOpacity>
32             </View>
33         )
34     }
35 
36     _onBtnPress(){
37         alert('點我幹嘛？')
38     }
39 }
40 
41 const styles=StyleSheet.create({
42     btnStyle:{
43         width:200,
44         height:40,
45         borderRadius:10,
46         backgroundColor:'red',
47         justifyContent:'center',
48         alignItems:'center'
49     }
50 })

2.App.js 引入自定義元件

/**
 * Sample React Native App
 * https://github.com/facebook/react-native
 *
 * @format
 * @flow strict-local
 */

import React from 'react';
import {
  SafeAreaView,
  StyleSheet,
  ScrollView,
  View,
  Text,
  StatusBar,
} from 'react-native';

import {
  Header,
  LearnMoreLinks,
  Colors,
  DebugInstructions,
  ReloadInstructions,
} from 'react-native/Libraries/NewAppScreen';
import CKButton from './components/CKButton'

const App: () => React$Node = () => {

  return (
    <>
      <StatusBar barStyle="dark-content" />
      <SafeAreaView style={styles.mainViewStyle}>

      <CKButton/>
      </SafeAreaView>
    </>
  );
};


const styles=StyleSheet.create({
  mainViewStyle:{
      flex:1,
      backgroundColor:'#fff',
  }
});


export default App;

3.結果如圖