小程序自定义导航栏兼容适配所有机型（附完整案例）

//app.json
"window": {
 "navigationStyle": "custom"
}

//page.json
{
 "navigationStyle": "custom"
}

const statusBarHeight = wx.getSystemInfoSync().statusBarHeight;

const menuButtonInfo = wx.getMenuButtonBoundingClientRect();//胶囊相关信息
const menuButtonHeight = menuButtonInfo.height //胶囊高度
const menuButtonTop = menuButtonInfo.top//胶囊距上边界距离

//app.js
App({
 onLaunch: function () {
 this.setNavBarInfo()
 },
 
 globalData: {
 //全局数据管理
 navBarHeight: 0, // 导航栏高度
 menuBotton: 0, // 胶囊距底部间距（保持底部间距一致）
 menuRight: 0, // 胶囊距右方间距（方保持左、右间距一致）
 menuHeight: 0, // 胶囊高度（自定义内容可与胶囊高度保证一致）
 },

 /**
 * @description 设置导航栏信息
 */
 setNavBarInfo () {
 // 获取系统信息
 const systemInfo = wx.getSystemInfoSync();
 // 胶囊按钮位置信息
 const menuButtonInfo = wx.getMenuButtonBoundingClientRect();
 // 导航栏高度 = 状态栏到胶囊的间距（胶囊距上距离-状态栏高度） * 2 + 胶囊高度 + 状态栏高度
 this.globalData.navBarHeight = (menuButtonInfo.top - systemInfo.statusBarHeight) * 2 + menuButtonInfo.height + systemInfo.statusBarHeight;
 this.globalData.menuBotton = menuButtonInfo.top - systemInfo.statusBarHeight;
 this.globalData.menuRight = systemInfo.screenWidth - menuButtonInfo.right;
 this.globalData.menuHeight = menuButtonInfo.height;
 }
})

//page.wxml
<view class="nav" style="height:{{navBarHeight}}px;">
 <!-- 胶囊区域 -->
 <view class="capsule-box" style="height:{{menuHeight}}px; min-height:{{menuHeight}}px; line-height:{{menuHeight}}px; bottom:{{menuBotton}}px;">
 <view class="nav-handle">
  <image class="nav-back-icon" src="/images/nav_back.png" bind:tap="navToBackLastPage"></image>
  <image class="nav-home-icon" src="/images/nav_home.png" bind:tap="navToHomePage"></image>
 </view>
 <view class="nav-title">导航标题</view>
 </view>
</view>

// page.js
const app = getApp()
Page({

 /**
 * 页面的初始数据
 */
 data: {
 navBarHeight: app.globalData.navBarHeight,//导航栏高度
 menuBotton: app.globalData.menuBotton,//导航栏距离顶部距离
 menuHeight: app.globalData.menuHeight //导航栏高度
 }

// components/navigation/index.wxml
<view class="nav" style="height:{{navBarHeight}}px;">
 <view class="nav-main">
 <!-- 胶囊区域 -->
 <view 
  class="capsule-box" 
  style="height:{{menuHeight}}px; min-height:{{menuHeight}}px; line-height:{{menuHeight}}px; bottom:{{menuBotton}}px;left:{{menuRight}}px;"
 >
 <!-- 导航内容区域 -->
  <slot></slot>
 </view>
 </view>
</view>

// components/navigation/index.wxss
.nav {
 position: fixed;
 top: 0;
 left: 0;
 width: 100vw;
}
.nav-main {
 width: 100%;
 height: 100%;
 position: relative;
}
.nav .capsule-box {
 position: absolute;
 box-sizing: border-box;
 width: 100%;
}

// components/navigation/index.js
const app = getApp()
Component({
 /**
 * 组件的初始数据
 */
 data: {
 navBarHeight: app.globalData.navBarHeight, //导航栏高度
 menuRight: app.globalData.menuRight, // 胶囊距右方间距（方保持左、右间距一致）
 menuBotton: app.globalData.menuBotton,
 menuHeight: app.globalData.menuHeight
 }
})

//index.json
{
 "navigationStyle": "custom",
 "navigationBarTextStyle": "white",
 "usingComponents": {
 "navigation": "/components/Navigation/index"
 }
}

<!-- 自定义导航 -->
<navigation>
 <view class="current-date">
  <text>4月24日</text>
 </view>
</navigation>