微信小程序开发中怎么自定义导航栏

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CustomNavBar.wxml

CustomNavBar.wxss

.custom-navbar-con { position: relative; width: 100%; background-color: white; z-index: 9999; }.custom-navbar-con .custom-navbar-statusbar-con { width: 100%; }.custom-navbar-con .custom-navbar-content { width: 100%; }.custom-navbar-con .custom-navbar-left-menu-con { position: absolute; }.custom-navbar-con .custom-navbar-left-menu-con .custom-navbar-icon-btn { height: 100%; border-radius: 200px; border: 1px solid rgba(220, 220, 220, 0.6); }.custom-navbar-con .custom-navbar-left-menu-con .custom-navbar-icon-btn .icon { height: 90%; margin-top: 2.5%; }.custom-navbar-con .custom-navbar-left-menu-con .custom-navbar-icon-btn .text { font-size: 27rpx; }.custom-navbar-con .custom-navbar-left-menu-con .custom-navbar-icon-btn.back { border: none; }.custom-navbar-con .custom-navbar-left-menu-con .custom-navbar-icon-btn.back~.custom-navbar-icon-btn.home { margin-left: 10rpx; }.custom-navbar-con .custom-navbar-left-menu-con .custom-navbar-icon-btn.switch-shop { padding-left: 5px; padding-right: 25rpx; }.custom-navbar-con.ios .custom-navbar-title.android { display: none; }.custom-navbar-con.android .custom-navbar-title.ios { display: none; }.custom-navbar-con .custom-navbar-title.ios { font-weight: bold; text-align: center; position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%); -webkit-transform: translate(-50%, -50%); }.custom-navbar-con .custom-navbar-title.android { padding-left: 30rpx; }```

CustomNavBar.js

```javascriptmodule.exports = function(PageInstance) { let App = getApp() let _tplData = { _CustomNavBar_: {  navRightMenuRect: App.NavRightMenuRect,  navRightMenuCenterY: App.NavRightMenuCenterY,  statusBarHeight: App.StatusBarHeight,  winWidth: App.WinWidth,  winHeight: App.WinHeight,  iOS: App.iOS,  navTitle: '', // 当前只合适短标题，如需长标题，建议隐藏自定义导航栏，自定义展示  navHeight: App.CustomNavHeight,  needFixed: false,  showNavBar: !App.NavRightMenuRect ? false : true,  showLeftMenu: true,  showBackBtn: true,  showHomeBtn: false } } let _tplMethods = { customNavBarBack() {  wx.navigateBack() }, customNavBarBackToHome() {  let url = '/pages/index/index'  wx.reLaunch({  url: url  }) } } let isIndexPage = !!(PageInstance.route == 'pages/index/index') let pages = getCurrentPages() if (pages.length == 1) { _tplData._CustomNavBar_.showBackBtn = false _tplData._CustomNavBar_.showHomeBtn = !isIndexPage } // 每个页面 可单独配置自定义导航栏 if (PageInstance.data.CustomNavBarConfig) { Object.assign(_tplData._CustomNavBar_, PageInstance.data.CustomNavBarConfig) } // !!!! 最后执行 // 当无法获取到右上角按钮胶囊的布局位置时，强制设置自定义导航栏为隐藏状态 if (!App.NavRightMenuRect) { _tplData._CustomNavBar_.showNavBar = false } Object.assign(PageInstance, _tplMethods) PageInstance.setData(_tplData) return this}

app.js的配置

// 自定义导航栏import CustomNavBar from './template/CustomNavBar/CustomNavBar'; App({ //自定义 模板式 组件 CustomNavBar,  // 系统信息  WinWidth: 0,  WinHeight: 0,  StatusBarHeight: 0,  PixelRatio: 1,  SystemFullName: '',  SystemVersion: '',  SystemSDKVersion: '',  //自定义导航栏相关  NavRightMenuRect: null,  NavRightMenuCenterY: 0,  CustomNavHeight: 0,   onLaunch: function (options) { let self = this let systemInfo = wx.getSystemInfoSync() self.iOS = systemInfo.platform === 'ios' self.isDebug = systemInfo.platform === 'devtools' if (self.isDebug) {  // 单纯为了在开发工具下调试 自定义导航栏  // 开发工具下不存在App版本号的区分  systemInfo.version = '7.0.0' } self.WinWidth = systemInfo.windowWidth self.WinHeight = systemInfo.windowHeight self.StatusBarHeight = systemInfo.statusBarHeight // 部分小程序库版本没有返回状态栏高度 if (!self.StatusBarHeight) {  self.StatusBarHeight = 20 } self.PixelRatio = Math.max(systemInfo.pixelRatio, 2) self.SystemFullName = systemInfo.system self.SystemVersion = systemInfo.version self.SystemSDKVersion = systemInfo.SDKVersion // app.json全局配置的自定义导航栏的话，客户端需求版本为6.6.0 // 每个页面 单独配置的自定义导航栏的话，客户端需求版本为7.0.0 // wx.getMenuButtonBoundingClientRect方法，要求基础库版本为2.1.0 if (self.compareVersion(self.SystemVersion, '6.6.0') >= 0) {  // 官方的6.6.0版本以上客户端，最低基础库版本为1.9.4  // 6.6.0以上且[1.9.4 - 2.1.0]范围内的机型无法使用wx.getMenuButtonBoundingClientRect  // 所以手动写死非全面屏手机的适配胶囊布局位置  self.NavRightMenuRect = {  top: 26,  bottom: 58,  right: self.WinWidth - 10,  width: 87,  height: 32  }  // 如果系统信息返回的状态栏高度大于20，认为是全面屏手机  if (self.StatusBarHeight > 20) {  self.NavRightMenuRect.top = 50  self.NavRightMenuRect.bottom = 82  }  // 2019年08月21日22:09:22  // 微信小程序库出现bug，导致部分机型wx.getMenuButtonBoundingClientRect无返回值  // 所以在这之前先默认写死一个NavRightMenuRect，防止全局的自定义导航栏已经隐藏了但是无法显示自定义导航栏  // 详见https://developers.weixin.qq.com/community/develop/doc/00062238d78e880aedd88b72351c00  if (wx.getMenuButtonBoundingClientRect) {  let NavRightMenuRect = wx.getMenuButtonBoundingClientRect()  self.NavRightMenuRect = {   top: NavRightMenuRect.top,   bottom: NavRightMenuRect.bottom,   right: NavRightMenuRect.right,   width: NavRightMenuRect.width,   height: NavRightMenuRect.height  }  }  self.NavRightMenuCenterY = self.NavRightMenuRect.top + self.NavRightMenuRect.height / 2  self.CustomNavHeight = self.NavRightMenuRect.bottom + (self.NavRightMenuRect.top - self.StatusBarHeight) } else {  self.NavRightMenuRect = null  self.CustomNavHeight = 0 } },   // 比较两个版本号 compareVersion (v1, v2) => {   v1 = v1.split('.')   v2 = v2.split('.')   const len = Math.max(v1.length, v2.length)    while (v1.length < len) {     v1.push('0')   }   while (v2.length < len) {     v2.push('0')   }    for (let i = 0; i < len; i++) {     const num1 = parseInt(v1[i])     const num2 = parseInt(v2[i])      if (num1 > num2) {       return 1     } else if (num1 < num2) {       return -1     }   }   return 0 }     }),

假如在index 页面引用

index.wxml

index.js

onLoad: function(options) {  new App.CustomNavBar(this) }

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