微信小程序—自定义顶部导航组件
在components中新建文件夹navbar
components/navbar.wxml
<!--components/navbar.wxml-->
<view class="navbar" style="height:{{navHeight+5}}px;background-image:url('{{imgUrl}}') ">
<!-- 左上角 返回按钮 和 home按钮 wx:if="{{showNav}}" 是控制左上角按钮的显示隐藏,首页不显示 -->
<view class="navbar_left" style="top:{{navTop}}px;height:{{jnheight-1}}px;width:{{jnwidth-3}}px" wx:if="{{showNav}}">
<!-- 控制返回按钮的显示 -->
<view class="navBack" bindtap="navBack">
<image src="/images/back.png" mode="widthFix"></image>
</view>
<!-- home按钮 wx:if="{{showHome}}" 是控制左上角 home按钮的显示隐藏-->
<view class="nav_line" bindtap="navHome" wx:if="{{showHome}}">
<image src="/images/index.png" mode="widthFix" style="width:50%"></image>
</view>
</view>
<!-- 中间标题 -->
<view class="navbar_title" style="top:{{navTop}}px;">{{pageName}}</view>
</view>
components/navbar.js
const App = getApp();
Component({
// 组件的属性列表
properties: {
pageName: String, //中间的title
showNav: { //判断是否显示左上角的按钮
type: Boolean,
value: true
},
showHome: { //判断是否显示左上角的home按钮
type: Boolean,
value: true
},
imgUrl:{//图片背景路径
type: String,
value: App.globalData.imgLink+'index.jpg',
},
},
// 组件的初始数据
data: {
showNav: true, //判断是否显示左上角的home按钮
showHome: true, //判断是否显示左上角的按钮
},
lifetimes: {
// 生命周期函数,可以为函数,或一个在methods段中定义的方法名
attached: function() {
this.setData({
navHeight: App.globalData.navHeight, //导航栏高度
navTop: App.globalData.navTop, //胶囊按钮与顶部的距离
jnheight: App.globalData.jnheight, //胶囊高度
jnwidth: App.globalData.jnwidth //胶囊宽度
})
}
},
// 组件的方法列表
methods: {
//回退
navBack: function() {
wx.navigateBack()
},
//回主页
navHome: function() {
wx.switchTab({
url: '/pages/index/index'
})
},
}
})
components/navbar.wxss
/* components/navbar.wxss */
.navbar {
width: 100%;
overflow: hidden;
position: sticky;
top: 0;
left: 0;
z-index: 10;
flex-shrink: 0;
background: #fff;
}
.navbar_left {
display: -webkit-flex;
display: flex;
-webkit-box-align: center;
-ms-flex-align: center;
-webkit-align-items: center;
align-items: center;
position: absolute;
left: 10px;
z-index: 11;
line-height: 1;
border: 1rpx solid #f0f0f0;
border-radius: 40rpx;
overflow: hidden;
background: rgba(255, 255, 255, 0.6);
}
.navBack image{
width: 60%;
}
.navbar_left view {
width: 50%;
display: flex;
align-items: center;
justify-content: center;
}
.nav_line {
border-left: 1rpx solid #f0f0f0;
}
.navbar_title {
width: 100%;
box-sizing: border-box;
padding-left: 115px;
padding-right: 115px;
height: 32px;
line-height: 32px;
text-align: center;
position: absolute;
left: 0;
z-index: 10;
color: #333;
font-size: 16px;
font-weight: bold;
text-overflow: ellipsis;
overflow: hidden;
white-space: nowrap;
}
在公共组件app.js中获取导航高度等信息
// app.js
App({
onLaunch() {
//设置导航栏
//获取菜单按钮的布局位置信息
let menuButtonObject = wx.getMenuButtonBoundingClientRect();
//获取系统信息
wx.getSystemInfo({
success: res => {
console.log('xxxx', res)
//状态栏的高度
let statusBarHeight = res.statusBarHeight,
//胶囊按钮与顶部的距离
navTop = menuButtonObject.top,
navHeight = statusBarHeight + menuButtonObject.height + (menuButtonObject.top - statusBarHeight) * 2;
let globalData = this.globalData;
globalData.navHeight = navHeight;//导航栏高度
globalData.navTop = navTop;//胶囊按钮与顶部的距离
globalData.jnheight = menuButtonObject.height;//胶囊的高度
globalData.jnwidth = menuButtonObject.width;//胶囊的宽度
globalData.screenHeight = res.screenHeight;//屏幕高度
},
fail(err) {
console.log(err);
}
});
},
//设置全局对象
globalData: {
navHeight: 0,
navTop: 0,
jnheight: 0,
jnwidth: 0,
screenHeight: 0,
}
})
在app.json中设置导航自定义,去除默认的导航 “navigationStyle”: "custom"
"window": {
"backgroundTextStyle": "light",
"navigationBarBackgroundColor": "#fff",
"navigationBarTitleText": "Weixin",
"navigationBarTextStyle": "black",
"navigationStyle": "custom"
},
引用到pages中的文件里
json文件中引用组件****
{
"usingComponents":{
"navbar":"/components/navbar/navbar"
}
}
hrml文件中
<navbar page-name="{{navbar.shoppingName}}"></navbar>
js文件中
Page({
data:{
navbar:{
shoppingName:'首页',
},
}