微信自带的顶部导航栏是无法支持自定义icon和增加元素的，在开发小程序的时候自带的根本满足不了需求，分享一个封装好的组件，支持自定义icon、扩展dom，适配安卓、ios、h5，全面屏。
我用的是京东的Taro多端编译框架写的小程序，原生的也可以适用，用到的微信/taro的api做调整就行，实现效果如下。
1、NavBar.js
import Taro from '@tarojs/taro';
import React, { Component } from 'react'
import { View } from '@tarojs/components';
import { isFunction } from '../../utils/index' //判断是否为函数，可以用loadsh的_isFunction,也可以自己封装。
import './NavBar.less';
function getSystemInfo () {
if (Taro.globalSystemInfo && !Taro.globalSystemInfo.ios) {
return Taro.globalSystemInfo;
} else {
// h5环境下忽略navbar
if (!isFunction(Taro.getSystemInfoSync)) {
return null;
}
let systemInfo = Taro.getSystemInfoSync() || {
model: '',
system: ''
};
let ios = !!(systemInfo.system.toLowerCase().search('ios') + 1);
let rect;
try {
rect = Taro.getMenuButtonBoundingClientRect "htmlcode">
view,
text,
scroll-view,
input,
button,
image,
cover-view {
box-sizing: border-box;
}
page {
/* prettier-ignore */
--height: 44PX; /* 4*2+32 */
/* prettier-ignore */
--right: 97PX; /* 10+87 */
/* prettier-ignore */
--navBarExtendHeight: 4PX;
/* prettier-ignore */
--navBarHeight: 68PX;
box-sizing: border-box;
}
.lxy-nav-bar .ios {
/* prettier-ignore */
--height: 44PX; /* 4*2+32 */
/* prettier-ignore */
--right: 97PX; /* 10+87 */
/* prettier-ignore */
--navBarExtendHeight: 4PX;
box-sizing: border-box;
}
.lxy-nav-bar .android {
/* prettier-ignore */
--height: 48PX; /* 8*2+32 */
/* prettier-ignore */
--right: 96PX; /* 10+87 */
/* prettier-ignore */
--navBarExtendHeight: 4PX;
box-sizing: border-box;
}
.lxy-nav-bar .devtools {
/* prettier-ignore */
--height: 42PX; /* 5*2+32 */
/* prettier-ignore */
--right: 88PX; /* 10+87 */
/* prettier-ignore */
--navBarExtendHeight: 4PX;
box-sizing: border-box;
}
.lxy-nav-bar__inner {
position: fixed;
top: 0;
left: 0;
z-index: 5001;
/* prettier-ignore */
height: var(--navBarHeight);
display: flex;
align-items: center;
padding-right: var(--right);
width: 100%;
/* prettier-ignore */
padding-top: 20PX;
/* prettier-ignore */
padding-bottom:4PX;
.placeholder {
position: absolute;
top: 0;
left: 0;
width: 100%;
}
}
.lxy-nav-bar__inner .lxy-nav-bar__left {
position: relative;
width: var(--right);
/* prettier-ignore */
height: 32PX;
/* padding-left: 10PX; */
/* prettier-ignore */
margin-left:10PX;
display: flex;
align-items: center;
}
.lxy-nav-bar__buttons {
height: 100%;
width: 100%;
display: flex;
align-items: center;
/* prettier-ignore */
border-radius: 16PX;
border: 1px solid rgba(204, 204, 204, 0.6);
position: relative;
}
.lxy-nav-bar__buttons.android {
border: 1px solid rgba(234, 234, 234, 0.6);
}
.lxy-nav-bar__buttons::after {
position: absolute;
content: '';
width: 1px;
/* prettier-ignore */
height: 18.4PX;
background: rgba(204, 204, 204, 0.6);
left: 50%;
top: 50%;
transform: translate(-50%, -50%);
}
.lxy-nav-bar__buttons.android::after {
background: rgba(234, 234, 234, 0.6);
}
.lxy-nav-bar__button {
width: 50%;
height: 100%;
display: flex;
/* prettier-ignore */
font-size: 12PX;
background-repeat: no-repeat;
background-position: center center;
background-size: 1em 2em;
}
.lxy-nav-bar__inner .lxy-nav-bar__left .lxy-nav-bar__btn_goback:active,
.lxy-nav-bar__inner .lxy-nav-bar__left .lxy-nav-bar__btn_gohome:active {
opacity: 0.5;
}
.lxy-nav-bar__inner .lxy-nav-bar__center {
/* prettier-ignore */
font-size: 17PX;
/* prettier-ignore */
line-height: 17PX;
text-align: center;
position: relative;
flex: 1;
display: -webkit-box;
display: -webkit-flex;
display: flex;
align-items: center;
justify-content: center;
/* prettier-ignore */
padding-left: 10PX;
text {
margin-top: -2px;
font-size:34px;
font-weight:550;
line-height:44px;
}
}
.lxy-nav-bar__inner .lxy-nav-bar__loading {
font-size: 0;
}
.lxy-nav-bar__inner .lxy-nav-bar__loading .lxy-loading {
margin-left: 0;
}
.lxy-nav-bar__inner .lxy-nav-bar__right {
/* prettier-ignore */
margin-right: 10PX;
}
.lxy-nav-bar__placeholder {
height: var(--navBarHeight);
background: #f8f8f8;
position: relative;
z-index: 50;
visibility: hidden;
}
.lxy-nav-bar-search {
width: 100%;
height: 100%;
display: flex;
justify-content: center;
align-items: center;
width: 100%;
/* prettier-ignore */
height: 32PX;
/* prettier-ignore */
border-radius: 16PX;
position: relative;
background: #f6f6f6;
}
.lxy-nav-bar-search__input {
height: 100%;
display: flex;
align-items: center;
color: #999;
/* prettier-ignore */
font-size: 15PX;
/* prettier-ignore */
line-height: 15PX;
}
.lxy-nav-bar__inner .lxy-nav-bar__left .lxy-nav-bar__btn_goback {
background-image: url("data:image/svg+xml;charset=utf8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='24' viewBox='0 0 12 24'%3E %3Cpath fill-opacity='.9' fill-rule='evenodd' d='M10 19.438L8.955 20.5l-7.666-7.79a1.02 1.02 0 0 1 0-1.42L8.955 3.5 10 4.563 2.682 12 10 19.438z'/%3E%3C/svg%3E");
}
.lxy-nav-bar__inner .lxy-nav-bar__left .lxy-nav-bar__btn_goback.white {
background-image: url("data:image/svg+xml;charset=utf8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='24' viewBox='0 0 12 24'%3E %3Cpath fill-opacity='.9' fill-rule='evenodd' d='M10 19.438L8.955 20.5l-7.666-7.79a1.02 1.02 0 0 1 0-1.42L8.955 3.5 10 4.563 2.682 12 10 19.438z' fill='%23ffffff'/%3E%3C/svg%3E");
}
.lxy-nav-bar__inner .lxy-nav-bar__left .lxy-nav-bar__btn_gohome {
background-image: url("data:image/svg+xml,%3Csvg t='1565752242401' class='icon' viewBox='0 0 1024 1024' version='1.1' xmlns='http://www.w3.org/2000/svg' p-id='4326' width='48' height='48'%3E%3Cpath d='M537.13744054-106.18008097999996c-12.56871953-12.56871953-31.42179957-12.56871953-50.27488108 0L28.10427953 195.46919964000006c-12.56871953 12.56871953-18.85308003 25.13744054-18.85308003 37.70616005l0 609.58292171c0 25.13744054 18.85308003 43.99052059 43.9905191 43.9905191l301.6492806 0c18.85308004 0 31.42179957-12.56871953 31.42180105-31.42179957l0-314.21800013c0-18.85308004 12.56871953-31.42179957 31.42179956-31.42180105l188.53080038 0c18.85308004 0 31.42179957 12.56871953 31.42179956 31.42180105l0 314.21800013c0 18.85308004 12.56871953 31.42179957 31.42180105 31.42179957L970.7582814 886.7488005c25.13744054 0 43.99052059-18.85308003 43.9905191-43.9905191L1014.7488005 233.17535969000005c0-12.56871953-6.2843605-25.13744054-18.85308003-37.70616005l-458.75827993-301.64928062z' fill='%23000000' p-id='4327'%3E%3C/path%3E%3C/svg%3E");
/* prettier-ignore */
background-size: 17PX 34PX;
margin-top: 10px;
}
.lxy-nav-bar__inner .lxy-nav-bar__left .lxy-nav-bar__btn_gohome.white {
background-image: url("data:image/svg+xml,%3Csvg t='1565752242401' class='icon' viewBox='0 0 1024 1024' version='1.1' xmlns='http://www.w3.org/2000/svg' p-id='4326' width='48' height='48'%3E%3Cpath d='M537.13744054-106.18008097999996c-12.56871953-12.56871953-31.42179957-12.56871953-50.27488108 0L28.10427953 195.46919964000006c-12.56871953 12.56871953-18.85308003 25.13744054-18.85308003 37.70616005l0 609.58292171c0 25.13744054 18.85308003 43.99052059 43.9905191 43.9905191l301.6492806 0c18.85308004 0 31.42179957-12.56871953 31.42180105-31.42179957l0-314.21800013c0-18.85308004 12.56871953-31.42179957 31.42179956-31.42180105l188.53080038 0c18.85308004 0 31.42179957 12.56871953 31.42179956 31.42180105l0 314.21800013c0 18.85308004 12.56871953 31.42179957 31.42180105 31.42179957L970.7582814 886.7488005c25.13744054 0 43.99052059-18.85308003 43.9905191-43.9905191L1014.7488005 233.17535969000005c0-12.56871953-6.2843605-25.13744054-18.85308003-37.70616005l-458.75827993-301.64928062z' fill='%23ffffff' p-id='4327'%3E%3C/path%3E%3C/svg%3E");
/* prettier-ignore */
background-size: 17PX 34PX;
margin-top: 10px;
}
.lxy-nav-bar-search__icon {
/* prettier-ignore */
width: 22PX;
/* prettier-ignore */
height: 22PX;
display: flex;
align-items: center;
justify-content: center;
background-image: url("data:image/svg+xml,%3Csvg t='1565691512239' class='icon' viewBox='0 0 1024 1024' version='1.1' xmlns='http://www.w3.org/2000/svg' p-id='1240' width='48' height='48'%3E%3Cpath d='M819.2 798.254545L674.909091 653.963636c46.545455-48.872727 74.472727-114.036364 74.472727-186.181818 0-151.272727-123.345455-274.618182-274.618182-274.618182-151.272727 0-274.618182 123.345455-274.618181 274.618182 0 151.272727 123.345455 274.618182 274.618181 274.618182 65.163636 0 128-23.272727 174.545455-62.836364l144.290909 144.290909c2.327273 2.327273 6.981818 4.654545 11.636364 4.654546s9.309091-2.327273 11.636363-4.654546c6.981818-6.981818 6.981818-18.618182 2.327273-25.6zM235.054545 467.781818c0-132.654545 107.054545-239.709091 239.709091-239.709091 132.654545 0 239.709091 107.054545 239.709091 239.709091 0 132.654545-107.054545 239.709091-239.709091 239.709091-132.654545 0-239.709091-107.054545-239.709091-239.709091z' fill='%23999999' p-id='1241'%3E%3C/path%3E%3C/svg%3E");
background-repeat: no-repeat;
background-size: cover;
}
input{
padding:0 20px !important;
text-align: start !important;
}
属性：
slot:
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