React Native 组件

　　自用笔记：本文属于自用笔记，不做详解，仅供参考。在此记录自己已理解并开始遵循的前端代码规范。What How Why

我们要想理解React Native应用的基本结构，我们首先需要先了解一些基本的React的概念，比如JSX语法、组件、state状态以及props属性。所以这篇我们重点讲讲Props，state和style样式。今天讲解的内容，都是根据React Native官方文档上的内容来的。

组件化开发：

组件的颗粒度设计主要取决于应用的结构设计。将公共部分拆分复用，提供公共组件。

导出组件Header：

module.exports = Header;

引入组件Header：

const Header = require('./header');
import Header from './header';

class luumans extends Component {
  render(){
    return (
      <Header></Header>
    )
  }
}

View

AppRegistry模式是React Native中最基本的模块，也是最常用的模块。

'use strict';
import React, { Component } from 'react';
import {
  AppRegistry,
  StyleSheet,
  Text,
  PixelRatio,
  View,
} from 'react-native';

class luumans extends Component {
  render(){
    return (
      <View style={styles.flexs}>
        <View style={styles.container}>
          <View style = {[styles.item,styles.center]}><Text style={styles.title}>酒店</Text>
          </View>
          <View style = {[styles.item,styles.lineLeftRight]}>
            <View style={[styles.flexs,styles.center,styles.lineCenter]}><Text style={styles.title}>海外酒店</Text></View>
            <View style={[styles.flexs,styles.center]}><Text style={styles.title}>特色酒店</Text></View>
          </View>
          <View style = {styles.item}>
            <View style={[styles.flexs,styles.center,styles.lineCenter]}><Text style={styles.title}>团购</Text></View>
            <View style={[styles.flexs,styles.center]}><Text style={styles.title}>客栈、公寓</Text></View>
          </View>
        </View>
      </View>
    )
  }
}

const styles = StyleSheet.create({
  container:{
    flexDirection: 'row',
    height: 80,
    borderRadius: 5,
    marginTop: 200,
    marginLeft: 5,
    marginRight: 5,
    backgroundColor: '#FF0067',
  },
  item:{
    flex: 1,
    height: 80,
  },
  title:{
    fontSize: 16,
    fontWeight: 'bold',
    color: '#FFF',
  },
  center:{
    justifyContent: 'center',
    alignItems: 'center',
  },
  flexs:{
    flex: 1,
  },
  lineCenter: {
    borderBottomWidth: 1/PixelRatio.get(),
    borderColor: '#FFF',
  },
  lineLeftRight: {
    borderLeftWidth: 1/PixelRatio.get(),
    borderRightWidth: 1/PixelRatio.get(),
    borderColor: '#FFF',
  },
});

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

Navigator

属性

configureScene

可选的函数，用来配置场景动画和手势。会带有两个参数调用，一个是当前的路由，一个是当前的路由栈。然后它应当返回一个场景配置对象

(route, routeStack) => Navigator.SceneConfigs.FloatFromRight

环境依赖：
PushFromRight (默认)
FloatFromRight
FloatFromLeft
FloatFromBottom
FloatFromBottomAndroid
FadeAndroid
HorizontalSwipeJump
HorizontalSwipeJumpFromRight
VerticalUpSwipeJump
VerticalDownSwipeJump

'use strict';
import React, { Component } from 'react';
import {
  AppRegistry,
  StyleSheet,
  Text,
  PixelRatio,
  Navigator,
  Image,
  View,
  ScrollView,
} from 'react-native';

import Xinlang from './app/page/xinlang';

class List extends Component {
  constructor(props) {
    super(props);
    this.state = {};
  }
  _pressButton(){
    const {navigator} = this.props;
    //为什么这里可以取得 props.navigator?请看上文:
    //<Component {...route.params} navigator={navigator} />
    //这里传递了navigator作为props
    if(navigator){
      navigator.push({
        name: 'Xinlang',
        component: Xinlang,
      })
    }
  }
  render(){
    return(
      <ScrollView style={styles.flex}>
        <Text style={styles.listItem} onPress={this._pressButton.bind(this)}>这些Android技术会很火</Text>
        <Text style={styles.listItem} onPress={this._pressButton.bind(this)}>为什么整个互联网行业都缺前端工程师？</Text>
        <Text style={styles.listItem} onPress={this._pressButton.bind(this)}>一个神奇的控件</Text>
      </ScrollView>
    );
  }
}
class Detail extends Component {
  constructor(props) {
    super(props);
    this.state = {};
  }
  _pressButton(){
    const {navigator} = this.props;
    if(navigator){
      //很熟悉吧，入栈出栈~ 把当前的页面pop掉，这里就返回到了上一个页面:List了
      navigator.pop();
    }
  }
  render(){
    return(
      <ScrollView style={styles.flex}>
        <Text style={styles.listItem} onPress={this._pressButton.bind(this)}>name</Text>
      </ScrollView>
    );
  }
}
class luumans extends Component {
  render(){
    let defaultName = 'List';
    let defaultComponent = List;
    return (
      <Navigator
        initialRoute = {{name: defaultName, component: defaultComponent}}
        //配置场景
        configureScene = {
          (route) => {
            //这个是页面之间跳转时候的动画，具体有哪些？可以看这个目录下，有源代码的: node_modules/react-native/Libraries/CustomComponents/Navigator/NavigatorSceneConfigs.js
            return Navigator.SceneConfigs.PushFromRight;
          }
        }
        renderScene = {
          (route,navigator) => {
            let Component = route.component;
            return <Component {...route.params} navigator = {navigator} />
          }
        }
      />
    );
  }
}

const styles = StyleSheet.create({
  flexs:{
    flex: 1,
  },
  listItem:{
    height: 40,
    marginLeft: 10,
    marginRight: 10,
    borderBottomWidth: 3/PixelRatio.get(),
    borderBottomColor: '#DDD',
    justifyContent: 'center',
    lineHeight: 30,
    fontSize: 16,
  },
});

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

NavigatorIOS

TextInput

属性

placeholder

placeholder="Red placeholder text color"

placeholderTextColor

placeholderTextColor="red"

defaultValue

defaultValue="Same BackgroundColor as View "

```
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```

ActivityIndicator

ActivityIndicatorIOS

DatePickerIOS

DrawerLayoutAndroid

Image

KeyboardAvoidingView

ListView

MapView

Modal

Navigator

NavigatorIOS

Picker

PickerIOS

ProgressBarAndroid

ProgressViewIOS

RefreshControl

ScrollView

SegmentedControlIOS

Slider

SliderIOS

StatusBar

SnapshotViewIOS

Switch

SwitchAndroid

SwitchIOS

TabBarIOS

TabBarIOS.Item

Text

TextInput

ToolbarAndroid

TouchableHighlight

TouchableNativeFeedback

TouchableOpacity

TouchableWithoutFeedback

View

ViewPagerAndroid

WebView

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