common\js\floating-button.js
common\js\startup-ad.js components\ns-mp-navbar\ns-mp-navbar.vue
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247
components/ns-mp-navbar/ns-mp-navbar.vue
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247
components/ns-mp-navbar/ns-mp-navbar.vue
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<template>
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<!--
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自绘导航栏:把原生导航栏左侧的 "<" 换成 "‹ 返回" 文字
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背景:微信小程序原生导航栏的返回按钮是客户端系统控件,pages.json 的任何配置、
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官方 <navigation-bar> 组件(只支持 title / front-color / background-color / loading)
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都无法修改它的内容。要显示"返回"二字,只能关闭原生栏后自绘。
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使用前提:
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1. 该页面在 pages.json 中开启 "navigationStyle": "custom"(组件只负责渲染,不自动改配置)
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2. 该页面不能是 web-view 页面 —— 官方明确 "navigationStyle: custom 对 web-view 组件无效",
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且 web-view 会铺满整页覆盖其他组件,自绘的导航栏不会显示
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布局:组件是普通流式节点(非 fixed),放在页面顶部即可把内容自然下推。
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-->
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<view
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v-if="visible"
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class="ns-mp-navbar"
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:class="{ 'is-fixed': fixed }"
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:style="{ background: bgColor, paddingTop: statusBarHeight + 'px' }"
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>
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<view class="ns-mp-navbar__inner" :style="{ height: navBarHeight + 'px' }">
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<view class="ns-mp-navbar__side">
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<view
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v-if="showBack && canBack"
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class="ns-mp-navbar__back"
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hover-class="ns-mp-navbar__back--hover"
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hover-stay-time="80"
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@tap="onBack"
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>
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<text class="iconfont icon-back_light ns-mp-navbar__arrow" :style="{ color }"></text>
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<text class="ns-mp-navbar__text" :style="{ color }">{{ backText }}</text>
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</view>
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<slot name="left"></slot>
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</view>
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<view class="ns-mp-navbar__title" :style="{ color }">{{ title }}</view>
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<view class="ns-mp-navbar__side ns-mp-navbar__side--right">
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<slot name="right"></slot>
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</view>
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</view>
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</view>
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</template>
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<script>
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// 状态栏 / 胶囊信息:用于算出与原生导航栏一致的布局高度
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let systemInfo = {};
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let menuButtonInfo = { top: 0, height: 32, right: 0, width: 0 };
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try {
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systemInfo = uni.getSystemInfoSync() || {};
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} catch (e) {
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systemInfo = {};
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}
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// #ifdef MP-WEIXIN || MP-BAIDU || MP-TOUTIAO || MP-QQ || MP-HARMONY
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try {
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menuButtonInfo = uni.getMenuButtonBoundingClientRect() || menuButtonInfo;
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} catch (e) {}
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// #endif
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export default {
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name: 'ns-mp-navbar',
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props: {
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// 中间标题
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title: {
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type: String,
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default: ''
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},
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// 导航栏背景色
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bgColor: {
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type: String,
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default: '#ffffff'
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},
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// 文字 / 图标颜色
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color: {
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type: String,
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default: '#000000'
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},
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// 返回按钮文字(原生导航栏只能显示 "<",这里可自定义)
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backText: {
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type: String,
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default: '返回'
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},
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// 是否显示返回按钮
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showBack: {
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type: Boolean,
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default: true
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},
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// 是否悬浮在页面之上(沉浸式页面用;false 时占文档流,会把内容往下推)
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fixed: {
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type: Boolean,
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default: false
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},
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// 无页面栈时(如分享直接进入)跳转的首页地址
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homePath: {
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type: String,
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default: '/pages/index/index'
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},
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// 自定义返回逻辑
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customBack: {
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type: Function,
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default: null
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},
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// H5 端是否渲染(H5 由 uni-app 自带头像栏,默认不渲染,避免双导航栏)
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showOnH5: {
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type: Boolean,
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default: false
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}
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},
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data() {
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return {
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statusBarHeight: systemInfo.statusBarHeight || 20,
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navBarHeight: 44,
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visible: true,
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// 页面栈里是否还有上级页面(无上级页面时原生导航栏也不显示返回键)
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canBack: true
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};
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},
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computed: {
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// 导航栏总高度(状态栏 + 内容区),页面如需自行占位可取该值
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navbarHeight() {
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return this.statusBarHeight + this.navBarHeight;
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}
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},
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created() {
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// 导航栏内容区高度:MP 端按胶囊位置推算,与原生导航栏保持一致;其余端用 44
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// #ifdef MP
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const statusBarHeight = this.statusBarHeight;
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const h = (menuButtonInfo.top - statusBarHeight) * 2 + menuButtonInfo.height;
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// 兜底:胶囊信息异常时退回 44
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this.navBarHeight = h > 0 ? h : 44;
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// #endif
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// #ifdef H5
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this.visible = this.showOnH5;
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// #endif
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},
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mounted() {
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// 页面栈只有一页(分享/扫码直达)时,原生导航栏也无返回键,这里保持一致
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const pages = (typeof getCurrentPages === 'function' && getCurrentPages()) || [];
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this.canBack = pages.length > 1;
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// 把实际总高度抛给页面,便于页面修正内容区高度,避免多出一屏空白
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this.$emit('ready', this.statusBarHeight + this.navBarHeight);
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},
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methods: {
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onBack() {
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if (typeof this.customBack === 'function') {
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this.customBack();
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return;
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}
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const pages = (typeof getCurrentPages === 'function' && getCurrentPages()) || [];
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if (pages.length > 1) {
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uni.navigateBack();
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return;
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}
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// 顶层页面(分享 / 扫码直接进入):回首页
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uni.switchTab({
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url: this.homePath,
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fail: () => {
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uni.reLaunch({ url: this.homePath });
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}
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});
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}
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}
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};
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</script>
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<style scoped lang="scss">
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.ns-mp-navbar {
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width: 100%;
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box-sizing: border-box;
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}
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.ns-mp-navbar.is-fixed {
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position: fixed;
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top: 0;
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left: 0;
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right: 0;
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z-index: 990;
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}
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.ns-mp-navbar__inner {
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position: relative;
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display: flex;
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align-items: center;
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width: 100%;
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box-sizing: border-box;
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}
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.ns-mp-navbar__side {
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position: relative;
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z-index: 1;
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display: flex;
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align-items: center;
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height: 100%;
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min-width: 160rpx;
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padding-left: 20rpx;
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box-sizing: border-box;
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}
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.ns-mp-navbar__side--right {
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justify-content: flex-end;
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padding-left: 0;
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padding-right: 20rpx;
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}
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.ns-mp-navbar__back {
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display: flex;
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align-items: center;
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padding: 10rpx 20rpx 10rpx 0;
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}
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.ns-mp-navbar__back--hover {
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opacity: 0.5;
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}
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.ns-mp-navbar__arrow {
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font-size: 34rpx;
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line-height: 1;
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}
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.ns-mp-navbar__text {
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margin-left: 2rpx;
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font-size: 30rpx;
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line-height: 1;
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}
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.ns-mp-navbar__title {
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position: absolute;
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left: 0;
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right: 0;
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top: 0;
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bottom: 0;
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display: flex;
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align-items: center;
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justify-content: center;
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padding: 0 160rpx;
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font-size: 32rpx;
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line-height: 1.2;
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text-align: center;
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overflow: hidden;
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text-overflow: ellipsis;
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white-space: nowrap;
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}
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</style>
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