微信小程序（18）-- 自定义头部导航栏

最近做的项目涉及相应的页面显示相应的顶部标题，所以就需要自定义头部导航了。

首先新建一个顶部导航公用组件topnav，导航高度怎么计算？

1.wx.getSystemInfo 和 wx.getSystemInfoSync 获取机器信息
2.screenHeight - windowHeight 计算标题栏高度
3.标题栏高度
'iPhone': 64,
'iPhone X': 88,
'android': 68

app.js

//app.js
App({
  onLaunch: function () {
    var that = this
    wx.getSystemInfo({
      success: function (res) {
        that.globalData.platform = res.platform
        let totalTopHeight = 68
        if (res.model.indexOf('iPhone X') !== -1) {
          totalTopHeight = 88
        } else if (res.model.indexOf('iPhone') !== -1) {
          totalTopHeight = 64
        }
        that.globalData.statusBarHeight = res.statusBarHeight
        that.globalData.titleBarHeight = totalTopHeight - res.statusBarHeight
      },
      failure() {
        that.globalData.statusBarHeight = 0
        that.globalData.titleBarHeight = 0
      }
    })
 })

还需更改配置app.json

"window": {
    "backgroundTextStyle": "light",
    "navigationBarBackgroundColor": "#15ae67",
    "navigationBarTitleText": "微信小程序",
    "navigationBarTextStyle": "white",
    "navigationStyle": "custom"
   //自定义导航栏配置
  }

topnav.wxml

<!--template.wxml-->
<!-- 这是自定义组件的内部WXML结构 -->
<view style="padding-top:{{someData.statusBarHeight+someData.titleBarHeight}}px">
  <view class="hh-header">
    <view class="status-bar" style="height:{{someData.statusBarHeight}}px"></view>
    <view class="title-bar" style="height:{{someData.titleBarHeight}}px">
      <view wx:if="{{isShowBack=='true'}}" class='hh-nav-back ico-back' bindtap='goback'></view>
      <view wx:if="{{isShowBack=='false'}}" class='hh-nav-back'></view>
      <view class="hh-title">{{innerTitle}}</view>
      <view class="hh-nav-right"></view>
    </view>
  </view>
</view>
<slot></slot>

topnav.json

{
  "component": true
}

topnav.js

const app = getApp()
Component({
  properties: {
    // 这里定义了innerText属性，属性值可以在组件使用时指定
    innerTitle: {
      type: String,
      value: '头部标题'
    },
    isShowBack: {
      type: String,
      value: "true"
    }
  },
  data: {
    // 这里是一些组件内部数据
    someData: {
      statusBarHeight: app.globalData.statusBarHeight,
      titleBarHeight: app.globalData.titleBarHeight
    }
  },
  methods: {
    // 这里是一个自定义方法
    goback: function () {
      wx.navigateBack({
        delta: 1,
      })
     }
  }
})

topnav.wxss


.ico-back{
   36rpx;
  height: 36rpx;
  background-size: contain;
  background-image: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACQAAAAkCAYAAADhAJiYAAAAGXRFWHRTb2Z0d2FyZQBBZG9iZSBJbWFnZVJlYWR5ccllPAAAAyZpVFh0WE1MOmNvbS5hZG9iZS54bXAAAAAAADw/eHBhY2tldCBiZWdpbj0i77u/IiBpZD0iVzVNME1wQ2VoaUh6cmVTek5UY3prYzlkIj8+IDx4OnhtcG1ldGEgeG1sbnM6eD0iYWRvYmU6bnM6bWV0YS8iIHg6eG1wdGs9IkFkb2JlIFhNUCBDb3JlIDUuNi1jMDY3IDc5LjE1Nzc0NywgMjAxNS8wMy8zMC0yMzo0MDo0MiAgICAgICAgIj4gPHJkZjpSREYgeG1sbnM6cmRmPSJodHRwOi8vd3d3LnczLm9yZy8xOTk5LzAyLzIyLXJkZi1zeW50YXgtbnMjIj4gPHJkZjpEZXNjcmlwdGlvbiByZGY6YWJvdXQ9IiIgeG1sbnM6eG1wPSJodHRwOi8vbnMuYWRvYmUuY29tL3hhcC8xLjAvIiB4bWxuczp4bXBNTT0iaHR0cDovL25zLmFkb2JlLmNvbS94YXAvMS4wL21tLyIgeG1sbnM6c3RSZWY9Imh0dHA6Ly9ucy5hZG9iZS5jb20veGFwLzEuMC9zVHlwZS9SZXNvdXJjZVJlZiMiIHhtcDpDcmVhdG9yVG9vbD0iQWRvYmUgUGhvdG9zaG9wIENDIDIwMTUgKFdpbmRvd3MpIiB4bXBNTTpJbnN0YW5jZUlEPSJ4bXAuaWlkOjAwRjFBMThDOEU1NDExRThCQUMxRTFBRUNDRDNCMkJEIiB4bXBNTTpEb2N1bWVudElEPSJ4bXAuZGlkOjAwRjFBMThEOEU1NDExRThCQUMxRTFBRUNDRDNCMkJEIj4gPHhtcE1NOkRlcml2ZWRGcm9tIHN0UmVmOmluc3RhbmNlSUQ9InhtcC5paWQ6MDBGMUExOEE4RTU0MTFFOEJBQzFFMUFFQ0NEM0IyQkQiIHN0UmVmOmRvY3VtZW50SUQ9InhtcC5kaWQ6MDBGMUExOEI4RTU0MTFFOEJBQzFFMUFFQ0NEM0IyQkQiLz4gPC9yZGY6RGVzY3JpcHRpb24+IDwvcmRmOlJERj4gPC94OnhtcG1ldGE+IDw/eHBhY2tldCBlbmQ9InIiPz7a0EjNAAAA80lEQVR42sTYOw7DIAwGYNxuPXHnTtygvUAuWalyE6WRMlBj7N/GEkOiCD4B4eHCzEUq3ljruPMe9fcstxcJOmGOqNNADcwR+SABs6SDOphrKqiHSZ3UGkwaSItJAY1gwkGjmFCQBRMGsmJCQB4MHOTFQEEIDAyEwkBASIwGRIrFr/XBZy03InpbQFJcFHW8Gu+2nnmUiFAM2daLzz/DVtHtaSc1DIX87SEo9MLoRkVsHS5U1OZqRkUeP0yo6APaMCrjCDuEyjrkq1GZ1yAVKvui2EXNuEqLqFnJBgk1LR3TQi08OWF1RqmyH8SAtB0yvgIMAGA41d9Fo4AZAAAAAElFTkSuQmCC);
  background-repeat: no-repeat;
  background-position-x: 20rpx;
}
.hh-header {
  position: fixed;
  top: 0;
   100%;
  background-color: #14ae66;
  z-index: 99;
}
.hh-title{
  font-size: 38rpx;
  text-align: center;
  color: #fff;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.title-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.hh-nav-right{
   116px;
}
.hh-nav-back{
   116px;

}

这样组件就写好了只需要在你每个页面里面用这个组件传不同的值就可以了。

index.wxml

<component-topnav inner-title="{{title}}"></component-topnav>  //显示返回按钮

<component-topnav inner-title="我的管理" is-show-back="false"></component-topnav> //不显示返回按钮

index.js

//获取应用实例
const app = getApp()
Page({
  data: {
    motto: 'Hello World',
    userInfo: {},
    title:'自定义导航标题'
  },
})

index.json

{
  "usingComponents": {
    "component-topnav": "/pages/component/topnav"
  }
}

微信小程序（18）-- 自定义头部导航栏

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