React Native 实战封装组件

  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

JSX实战

Reactnative中没有DOM的概念,只有组件的概念,所以我们HTML标签、DOM操作是无效的。但是组件的生命周期、JSX语法、事件绑定、自定义属性等,ReactNative与React.js是一样的。

封装Box组件

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

class Box extends Component{
render(){
return (
<View style={[BoxStyles.box,BoxStyles[this.props.width],BoxStyles[this.props.height]]}>
<View style={[BoxStyles.top,BoxStyles.height50,BoxStyles[this.props.classBg]]}><Text>top</Text></View>
<View style={[BoxStyles[this.props.childName]]}>
<View style={[BoxStyles.left,BoxStyles[this.props.classBg]]}><Text>left</Text></View>
{this.props.children}
<View style={[BoxStyles.right,BoxStyles[this.props.classBg]]}><Text>right</Text></View>
</View>
<View style={[BoxStyles.bottom,BoxStyles.height50,BoxStyles[this.props.classBg]]}><Text>bottom</Text></View>
<View style={[BoxStyles.label]}><Text>{this.props.boxName}</Text></View>
</View>
)
}
}

class MargginBox extends Component{
render(){
return (
<View style={[BoxStyles.margginBox]}>
<Box childName="borderBox" height="height400" width="width400" boxName="margin" classBg="bgred">{this.props.children}</Box>
</View>
)
}
}

class BorderBox extends Component{
render(){
return (
<Box childName="paddingBox" height="height300" width="width300" boxName="border" classBg="bggreen" >{this.props.children}</Box>
)
}
}

class PaddingBox extends Component{
render(){
return (
<Box childName="elementBox" height="height200" width="width200" boxName="padding" classBg="bgyellow" >{this.props.children}</Box>
)
}
}

class ElementBox extends Component{
render(){
return (
<View style={[BoxStyles.box,BoxStyles.height100]}>
<View style={[BoxStyles.measureBox]}>
<View style={[BoxStyles.right]}><Text>height</Text></View>
</View>
<View style={[BoxStyles.bottom,BoxStyles.height50]} ><Text>width</Text></View>
<View style={[BoxStyles.label]}><Text>element</Text></View>
<View style={[BoxStyles.widthdashed]}></View>
<View style={[BoxStyles.heightdashed]}></View>
</View>
)
}
}

class luumans extends Component {
render(){
return (
<MargginBox>
<BorderBox>
<PaddingBox>
<ElementBox>
</ElementBox>
</PaddingBox>
</BorderBox>
</MargginBox>
)
}
}

const BoxStyles = StyleSheet.create({
height50:{
height: 50,
},
height400:{
height: 400,
},
height300:{
height: 300,
},
height200:{
height: 200,
},
height100:{
height: 100,
},
width400:{
width: 400,
},
width300:{
width: 300,
},
width200:{
width: 200,
},
width100:{
width: 100,
},
bgred: {
backgroundColor:'#6AC5AC',
},
bggreen: {
backgroundColor: '#414142',
},
bgyellow: {
backgroundColor: '#D64078',
},
box: {
flexDirection: 'column',
flex: 1,
position: 'relative',
},
label: {
top: 0,
left: 0,
paddingTop: 0,
paddingRight: 3,
paddingBottom: 3,
paddingLeft: 0,
position: 'absolute',
backgroundColor: '#FDC72F',
},
top: {
justifyContent: 'center',
alignItems: 'center',
},
bottom: {
justifyContent: 'center',
alignItems: 'center',
},
right: {
width: 50,
justifyContent: 'space-around',
alignItems: 'center',
},
left: {
width: 50,
justifyContent: 'space-around',
alignItems: 'center',
},
heightdashed: {
bottom: 0,
top: 0,
right: 20,
borderLeftWidth: 1,
position: 'absolute',
borderLeftColor: '#FDC72F',
},
widthdashed: {
bottom: 25,
left: 0,
right: 0,
borderTopWidth: 1,
position: 'absolute',
borderTopColor: '#FDC72F',
},
yellow: {
color: '#FDC72F',
fontWeight:'900',
},
white: {
color: 'white',
fontWeight:'900',
},
margginBox:{
position: 'absolute',
top: 100,
paddingLeft:7,
paddingRight:7,
},
borderBox:{
flex: 1,
justifyContent: 'space-between',
flexDirection: 'row',
},
paddingBox:{
flex: 1,
justifyContent: 'space-between',
flexDirection: 'row',
},
elementBox:{
flex: 1,
justifyContent: 'space-between',
flexDirection: 'row',
},
measureBox:{
flex: 1,
flexDirection: 'row',
justifyContent: 'flex-end',
alignItems:'flex-end',
},
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('luumans', () => luumans);
文章目录
  1. 1. JSX实战
    1. 1.1. 封装Box组件
,