注释：自定义导航需要自备相应图片
一、设置自定义顶部导航
Navigation是小程序的顶部导航组件，当页面配置navigationStyle设置为custom的时候可以使用此组件替代原生导航栏。
1.全局顶部导航自定义，在app.json的“window”里添加"navigationStyle": "custom"
2.只在某一个页面自定义顶部导航，在该页面的json文件里添加"navigationStyle": "custom"
二、获取手机屏幕数据，app.js
//app.js
const Utils = require('./utils/utils')
App({
onLaunch: function () {
// 获取屏幕参数
try {
const res = wx.getSystemInfoSync()
if (res.platform == 'ios') {
this.globalData.platform = 'ios'
} else if (res.platform == 'android') {
this.globalData.platform = 'android'
}
// 导航高度
let navHeight = res.statusBarHeight
// 屏幕宽度/高度，单位px
this.globalData.screenWidth = res.screenWidth
this.globalData.screenHeight = res.screenHeight
// 状态栏的高度，单位px
this.globalData.statusBarHeight = res.statusBarHeight
// 设备像素比
this.globalData.pixelRatio = res.pixelRatio
// 可使用窗口宽度，单位px
this.globalData.winWidth = res.windowWidth
// 安卓时，胶囊距离状态栏8px，iOS距离4px
if (res.system.indexOf('Android') !== -1) {
this.globalData.navHeight = navHeight + 14 + 32
this.globalData.navTitleTop = navHeight + 8
// 视窗高度 顶部有占位栏时
this.globalData.winHeight = res.screenHeight - navHeight - 14 - 32
// tab主页视窗高度
this.globalData.winHeightTab = res.windowHeight - navHeight - 14 - 32
} else {
this.globalData.navHeight = navHeight + 12 + 32
this.globalData.navTitleTop = navHeight + 4
// 视窗高度 顶部有占位栏时
this.globalData.winHeight = res.screenHeight - navHeight - 12 - 32
// tab主页视窗高度
this.globalData.winHeightTab = res.windowHeight - navHeight - 12 - 32
}
console.log(wx.getSystemInfoSync(), this.globalData.winHeightTab)
} catch (e) {
console.log(e)
}
},
globalData: {
platform: 'ios',
pixelRatio: 2,
statusBarHeight: 20,
navHeight: 64,
navTitleTop: 26,
winHeight: 655,
winWidth: 750,
screenWidth: 375,
screenHeight: 812
}
})
三、封装导航组件，根目录创建components/navbar文件夹，创建Component
<!--navbar.wxml-->
<view>
<view class="nav-bar {{isWhite=='true'?'nav-bar-white':''}}" style="height: {{navHeight}}px;background-color:{{navColor}};" catchtap="toTop">
<text class="navbar-title" style="top:{{navTitleTop}}px;color:{{navTitleColor}};">{{navTitle}}</text>
<view wx:if="{{noArrow=='false'&&isArrowWhite=='false'&&isNavHome=='false'}}" catchtap="navBack" class="navbar-icon-wrap" style="top:{{navTitleTop}}px;">
<image class="navbar-icon" src="../../images/arrow_left.png"></image>
</view>
<view wx:if="{{isArrowWhite=='true'&&isNavHome=='false'&&noArrow=='false'}}" catchtap="navBack" class="navbar-icon-wrap" style="top:{{navTitleTop}}px;">
<image src="../../images/arrow_left_white.png" class="navbar-icon"></image>
</view>
<view wx:if="{{isNavHome=='true'&&isArrowWhite=='false'&&noArrow=='false'}}" catchtap="navHome" class="navbar-icon-wrap" style="top:{{navTitleTop}}px;">
<image src="../../images/Home@3x.png" class="navbar-icon"></image>
</view>
<view wx:if="{{isNavHome=='true'&&isArrowWhite=='true'&&noArrow=='false'}}" catchtap="navHome" class="navbar-icon-wrap" style="top:{{navTitleTop}}px;">
<image src="../../images/Home@3x_white.png" class="navbar-icon"></image>
</view>
</view>
<view wx:if="{{isWhite=='true'}}" class="nav-bar-place" style="height: {{navHeight}}px;background-color:{{navColor}};"></view>
</view>
// navbar.js
const app = getApp()
Component({
/**
* 组件的属性列表
*/
properties: {
navHeight: {
type: Number,
value: 20
},
navTitleTop: {
type: Number,
value: 26
},
navTitle: { // 导航标题 可以为空
type: String,
value: ''
},
navTitleColor: { // 导航标题颜色 默认黑色
type: String,
value: '#000'
},
isWhite: { // 是否为白底
type: String,
value: 'true'
},
noArrow: { // 取消返回箭头
type: String,
value: 'false'
},
isArrowWhite: {//白色箭头
type: String,
value: 'false'
},
isNavHome: { // 返回首页
type: String,
value: 'false'
},
navColor: { // 导航栏背景色 默认白色
type: String
},
backPath: { // 返回页面路径
type: String,
default: ''
},
backDelta: { // 返回页面层数
type: Number,
default: 1
}
},
/**
* 组件的初始数据
*/
data: {
navHeight: 0,
navTitleTop: 0
},
attached() {
// 在组件实例进入页面节点树时执行
// 获取顶部导航高度
this.setData({
navHeight: app.globalData.navHeight,
navTitleTop: app.globalData.navTitleTop
})
},
/**
* 组件的方法列表
*/
methods: {
// 回到首页
navHome:function(){
wx.switchTab({
url: '/pages/index/index'
})
},
// 回到顶部
toTop: function () {
wx.pageScrollTo({
scrollTop: 0,
duration: 300
})
this.triggerEvent('scrollEvent', {}) // 可绑定点击标题栏时的事件
},
// 返回上一页
navBack: function () {
if (this.properties.backPath === '') {
wx.navigateBack({
delta: this.properties.backDelta
})
} else {
wx.redirectTo({
url: this.properties.backPath
})
}
this.triggerEvent('backEvent', {}) // 可绑定点击返回时的事件
}
}
})
/* navbar.wxss */
/*自定义导航栏*/
.nav-bar {
position: fixed;
top: 0;
left: 0;
width: 100%;
z-index: 999999;
}
.nav-bar-white {
background-color: #fff;
}
.navbar-title {
position: absolute;
height: 32px;
line-height: 32px;
/* width: 100%; */
width: 320rpx;
text-align: center;
font-size: 16px;
color: #000;
overflow: hidden;
white-space: nowrap;
text-overflow: ellipsis;
left: 28%;
}
.navbar-icon-wrap {
position: absolute;
left: 9px;
width: 44px;
height: 32px;
display: flex;
justify-content: center;
align-items: center;
}
.navbar-icon {
width: 44px;
height: 32px;
}
.navbar-scan {
width: 28px;
height: 28px;
}
四、引入组件
五、使用组件（根据属性可以自由配置导，这里例举几个样式，也可以根据自己需求更改组件）
<navbar navTitle="顶部导航demo" style="width:200rpx;"></navbar>
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<navbar navTitle="无返回顶部导航" noArrow="true"></navbar>
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<navbar navTitle="透明导航" isWhite="false" isArrowWhite='true' navTitleColor="#fff"></navbar>
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<navbar navTitle="主页按钮导航" isNavHome='true' isArrowWhite='false' noArrow='false'></navbar>
