ReactNative: 不一样的 HelloWorld_simulator模拟器 loading from pre-bundled file-优快云博客

如果之前你折腾过 ReactNative, 那么跑起来的效果就是几行文字.

今天给大家展示一下在官方 start 的例子基础之上展示不一样的效果.

声明

1.ReactNative 版本是0.32.0
2.React 版本是15.3.0

下面跟大家分享如何展示 RN 自带的按钮组件.
后面会陆续给大家分享如何自定义按钮以及如何处理事件的传递等.

UI 效果图如下:

其中, 按钮1, 是TouchableOpacity
按钮2, 是TouchableHighlight, 自带按下效果.

index.ios.js

 * MZRNTutorial React Native App
 *
 * https://github.com/facebook/react-native
 */

import React, { Component } from 'react';

import {
  AppRegistry,
  StyleSheet,
  Text,
  View,
  Platform,/* 平台信息 */
  TouchableOpacity,
  TouchableHighlight
} from 'react-native';

class MZRNTutorial extends Component {

  /* 构造函数 */
  constructor(props)
  {
      super(props);
      this.state={status:1};
  }

  /* 按钮点击事件 */
  customPressHandler = () => {
      alert('当前状态: ' + this.state.status);

      this.state.status += 1;
  }

  render() {
    console.log('render ...');

    return (
      <View style={styles.container}>
        <Text style={styles.welcome}>
          Use 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>

        {/* 显示当前平台信息*/}
        <Text style={styles.platformInfo}>
            current os: {Platform.OS}
        </Text>

        {/* 添加按钮1*/}
        <TouchableOpacity
            style={styles.button}
            onPress={this.customPressHandler}
            >
            <Text style={styles.buttonText}>确定</Text>
        </TouchableOpacity>

         {/* 添加按钮2*/}
        <TouchableHighlight
            style={styles.button}
            onPress={this.customPressHandler}
            >
            <Text style={styles.buttonText}>取消</Text>
        </TouchableHighlight>

    </View>
    );
  }
}

const styles = StyleSheet.create({
  button: {
    height: 40,
    width: 200,
    borderRadius: 5,
    justifyContent: 'center',
    backgroundColor: 'green',
    overflow: 'hidden',
    margin: 20
  },
  buttonText: {
    textAlign: 'center',
    color: 'white'
  },
  container: {
    flex: 1,
    justifyContent: 'center',
    alignItems: 'center',
    backgroundColor: '#FAF5F0',
  },
  welcome: {
    fontSize: 20,
    textAlign: 'center',
    margin: 10,
  },
 platformInfo: {
    fontSize: 30,
    textAlign: 'center',
    margin: 10,
  },

  instructions: {
    textAlign: 'center',
    color: '#333333',
    marginBottom: 5,
  },
  flowRight: {
   flexDirection: 'row',
   alignItems: 'center',
   alignSelf: 'stretch'
 },

});

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

AppDelegate.m

 * Copyright (c) 2015-present, Facebook, Inc.
 * All rights reserved.
 *
 * This source code is licensed under the BSD-style license found in the
 * LICENSE file in the root directory of this source tree. An additional grant
 * of patent rights can be found in the PATENTS file in the same directory.
 */

#import "AppDelegate.h"
#import "IDSRNConfig.h"
#import "RCTRootView.h"

@implementation AppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
  NSURL *jsCodeLocation;

  /**
   * Loading JavaScript code - uncomment the one you want.
   *
   * OPTION 1
   * Load from development server. Start the server from the repository root:
   *
   * $ npm start
   *
   * To run on device, change `localhost` to the IP address of your computer
   * (you can get this by typing `ifconfig` into the terminal and selecting the
   * `inet` value under `en0:`) and make sure your computer and iOS device are
   * on the same Wi-Fi network.
   */

  //kLocalHostIP 是我本机 ip 定义的宏
  NSString *urlStr = [NSString stringWithFormat:@"http://%@:8081/index.ios.bundle?platform=ios&dev=true", kLocalHostIP];
  jsCodeLocation = [NSURL URLWithString:urlStr];

  /**
   * OPTION 2
   * Load from pre-bundled file on disk. The static bundle is automatically
   * generated by the "Bundle React Native code and images" build step when
   * running the project on an actual device or running the project on the
   * simulator in the "Release" build configuration.
   */

  //jsCodeLocation = [[NSBundle mainBundle] URLForResource:@"main" withExtension:@"jsbundle"];

  RCTRootView *rootView = [[RCTRootView alloc] initWithBundleURL:jsCodeLocation
                                                      moduleName:@"MZRNTutorial"
                                               initialProperties:nil
                                                   launchOptions:launchOptions];
  rootView.backgroundColor = [[UIColor alloc] initWithRed:1.0f green:1.0f blue:1.0f alpha:1];

  self.window = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];
  UIViewController *rootViewController = [UIViewController new];
  rootViewController.view = rootView;
  self.window.rootViewController = rootViewController;
  [self.window makeKeyAndVisible];

  return YES;
}

@end