React Native学习教程之自定义NavigationBar详解

// navigationbar 导航条的自定义封装 
// create by 小广 
'use strict'; 
import react, { component,proptypes } from 'react'; 
import { 
 image, 
 text, 
 view, 
 platform, 
 touchableopacity, 
} from 'react-native'; 
 
import styles from './navigationbarstyle' 
 
// 导航条和状态栏的高度 
const status_bar_height = 20 
const nav_bar_height = 44 
 
export default class navigationbar extends component { 
 static defaultprops = { 
 title: 'title', 
 titletextcolor: '#383838', 
 titleviewfunc () {}, 
 barbgcolor: '#f8f8f8', 
 baropacity: 1, 
 barstyle: 0, 
 barborderbottomcolor: '#d4d4d4', 
 barborderbottomwidth: 0.8, 
 statusbarshow: true, 
 leftitemtitle: '', 
 lefttextcolor: '#383838', 
 leftitemfunc () {}, 
 rightitemtitle: '', 
 righttextcolor: '#383838', 
 rightitemfunc () {}, 
 //leftimagesource: require('./nav_back.png'), 
 }; 
 static proptypes = { 
 title: proptypes.string,   // nav标题 
 titletextcolor: proptypes.string, // nav标题颜色 
 titleview: proptypes.node,  // nav自定义标题view(节点) 
 titleviewfunc: proptypes.func, // nav的titleview点击事件 
 barbgcolor: proptypes.string, // bar的背景颜色 
 baropacity: proptypes.number, // bar的透明度 
 barstyle: proptypes.number, // bar的扩展属性,nav样式(暂未使用) 
 barborderbottomcolor: proptypes.string, // bar底部线的颜色 
 barborderbottomwidth: proptypes.number, // bar底部线的宽度 
 statusbarshow: proptypes.bool,  // 是否显示状态栏的20高度(默认true) 
 leftitemtitle: proptypes.string, // 左按钮title 
 leftimagesource: proptypes.node, // 左item图片(source) 
 lefttextcolor: proptypes.string, // 左按钮标题颜色 
 leftitemfunc: proptypes.func,  // 左item事件 
 rightitemtitle: proptypes.string, // 右按钮title 
 rightimagesource: proptypes.node, // 右item图片(source) 
 righttextcolor: proptypes.string, // 右按钮标题颜色 
 rightitemfunc: proptypes.func,  // 右item事件 
 }; 
 
 render() { 
 // 判断左item的类型 
 var onlylefticon = false; // 是否只是图片 
 if (this.props.leftitemtitle && this.props.leftimagesource) { 
  onlylefticon = true; 
 } else if (this.props.leftimagesource) { 
  onlylefticon = true; 
 } 
 
 // 左侧图片title都没有的情况下 
 var noneleft = false; 
 if (!(this.props.leftitemtitle.length > 0) && !(this.props.leftimagesource)) { 
  noneleft = true; 
 } 
 
 // 判断是否自定义titleview 
 var hastitleview = false; 
 if (this.props.title && this.props.titleview) { 
  hastitleview = true; 
 } else if (this.props.titleview) { 
  hastitleview = true; 
 } 
 
 // 判断右item的类型 
 var onlyrighticon = false; // 是否只是图片 
 if (this.props.rightitemtitle && this.props.rightimagesource) { 
  onlyrighticon = true; 
 } else if (this.props.rightimagesource) { 
  onlyrighticon = true; 
 } 
 
 // 右侧图片title都没有的情况下 
 var noneright = false; 
 if (!(this.props.rightitemtitle.length > 0) && !(this.props.rightimagesource)) { 
  noneright = true; 
 } 
 
 // 判断是否显示20状态栏高度 
 let showstatusbar = this.props.statusbarshow; 
 if (platform.os === 'android') { 
  // 安卓不显示 
  showstatusbar = false; 
 } 
 return ( 
  <view style={styles.nav_barview}> 
  <view style={[styles.nav_bar, 
   { 
   backgroundcolor: this.props.barbgcolor, 
   height: showstatusbar ? nav_bar_height + status_bar_height : nav_bar_height, 
   opacity: this.props.baropacity 
   }, 
   showstatusbar ? { paddingtop: status_bar_height } : {}, this.props.barstyle]}> 
   <view style={styles.nav_itemview}> 
   { // 左侧item 
    !noneleft 
    ? <touchableopacity 
     style={styles.nav_leftitem} 
     onpress={this.props.leftitemfunc}> 
     { // 左侧是图片还是文字 
     onlylefticon 
     ? <image style={styles.nav_leftimage} 
        source={this.props.leftimagesource}/> 
     : <text style={[styles.nav_lefttitle,{color: this.props.lefttextcolor}]}> 
      {this.props.leftitemtitle} 
      </text> 
     } 
    </touchableopacity> 
    : null 
   } 
   </view> 
   { 
   hastitleview 
   ? <touchableopacity style={styles.nav_titleview} onpress={this.props.titleviewfunc}> 
    {this.props.titleview} 
    </touchableopacity> 
   : <view style={styles.nav_titleview}> 
    <text style={[styles.nav_title,{color:this.props.titletextcolor}]}> 
     {this.props.title} 
    </text> 
    </view> 
   } 
   <view style={styles.nav_itemview}> 
   { // 右侧item 
    !noneright 
    ? <touchableopacity 
     style={styles.nav_rightitem} 
     onpress={this.props.rightitemfunc}> 
     { // 右侧是图片还是文字 
     onlyrighticon 
     ? <image style={styles.nav_rightimage} 
        source={this.props.rightimagesource}/> 
     : <text style={[styles.nav_righttitle,{color: this.props.righttextcolor}]}> 
      {this.props.rightitemtitle} 
      </text> 
     } 
    </touchableopacity> 
    : null 
   } 
   </view> 
  </view> 
  <view style={{height:this.props.barborderbottomwidth,backgroundcolor:this.props.barborderbottomcolor}}></view> 
  </view> 
 
 ); 
 } 
} 

// navigationbarstyle 导航条的样式 
// create by 小广 
'use strict'; 
import { 
 stylesheet, 
} from 'react-native'; 
 
export default stylesheet.create({ 
 // navbar 
 nav_barview:{ 
 justifycontent: 'center', 
 }, 
 nav_bar: { 
 //flex:1, 
 flex: 1, 
 flexdirection:'row', 
 justifycontent: 'center', 
 }, 
 
 // 标题纯title 
 nav_title: { 
 fontsize:17, 
 }, 
 
 // titleview 
 nav_titleview: { 
 flex: 1, 
 alignitems: 'center', 
 justifycontent: 'center', 
 }, 
 
 nav_itemview:{ 
 width:80, 
 justifycontent: 'center', 
 }, 
 
 // 左item 
 nav_leftitem: { 
 marginleft:8, 
 flex:1, 
 justifycontent: 'center', 
 alignself: 'flex-start', 
 //backgroundcolor:'#f00', 
 }, 
 
 // 左item为title 
 nav_lefttitle: { 
  marginright:5, 
  marginleft:5, 
  fontsize: 14, 
 }, 
 
 // 左图片 
 nav_leftimage: { 
  margin:10, 
  resizemode:'contain', 
 }, 
 
 // 右item 
 nav_rightitem: { 
  marginright:8, 
  flex:1, 
  justifycontent: 'center', 
  alignself: 'flex-end', 
  //backgroundcolor:'#3393f2', 
 }, 
 
 // 右item为title 
 nav_righttitle: { 
  marginright:5, 
  marginleft:5, 
  fontsize: 14, 
 }, 
 
 // 右图片 
 nav_rightimage:{ 
  margin:10, 
  resizemode:'contain', 
  //backgroundcolor:'#f00', 
 }, 
 //resizemode:'contain', 
}); 

class xgrndemo extends component { 
 
 _leftitemaction() { 
 console.log('左侧按钮点击了'); 
 } 
 
 _rightitemaction() { 
 console.log('右侧按钮点击了'); 
 } 
 
 render() { 
 return ( 
  <view style={styles.container}> 
  <navigationbar 
   title='这个是标题' 
   leftimagesource={require('./nav_back.png')} 
   rightitemtitle='按钮' 
   righttextcolor='#3393f2' 
   leftitemfunc={this._leftitemaction.bind(this)} 
   rightitemfunc={this._rightitemaction.bind(this)}/> 
  <scrollview style={styles.container} 
   automaticallyadjustcontentinsets={false} 
   keyboardshouldpersisttaps={true} 
   keyboarddismissmode='on-drag' 
   > 
   <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> 
  </scrollview> 
  </view> 
 ); 
 } 
} 
 
const styles = stylesheet.create({ 
 container: { 
 flex: 1, 
 backgroundcolor: '#f5fcff', 
 }, 
 welcome: { 
 fontsize: 20, 
 textalign: 'center', 
 margin: 10, 
 }, 
 instructions: { 
 textalign: 'center', 
 color: '#333333', 
 marginbottom: 5, 
 }, 
}); 

title: proptypes.string,   // nav标题 
titletextcolor: proptypes.string, // nav标题颜色 
titleview: proptypes.node,  // nav自定义标题view(节点) 
titleviewfunc: proptypes.func, // nav的titleview点击事件 
barbgcolor: proptypes.string, // bar的背景颜色 
baropacity: proptypes.number, // bar的透明度 
barstyle: proptypes.number, // bar的扩展属性,nav样式(暂未使用) 
barborderbottomcolor: proptypes.string, // bar底部线的颜色 
barborderbottomwidth: proptypes.number, // bar底部线的宽度 
statusbarshow: proptypes.bool,  // 是否显示状态栏的20高度(默认true) 
leftitemtitle: proptypes.string, // 左按钮title 
leftimagesource: proptypes.node, // 左item图片(source) 
lefttextcolor: proptypes.string, // 左按钮标题颜色 
leftitemfunc: proptypes.func,  // 左item事件 
rightitemtitle: proptypes.string, // 右按钮title 
rightimagesource: proptypes.node, // 右item图片(source) 
righttextcolor: proptypes.string, // 右按钮标题颜色 
rightitemfunc: proptypes.func,  // 右item事件