微信小程序自定义 navigationBar 顶部导航栏，兼容适配所有机型

1. 实现效果

2. App.vue

1. 在App.vue 中，设置获取的 StatusBar，CustomBar 高度（实现适配高度写法）
2. uni.getSystemInfo 获取可视区域的高度
3. wx.getMenuButtonBoundingClientRect() 胶囊按钮位置信息

<script>
	import Vue from 'vue'
	export default {
		onLaunch: function() {
			uni.getSystemInfo({
				success: function(e) {
					// #ifndef MP
					Vue.prototype.StatusBar = e.statusBarHeight;
					if (e.platform == 'android') {
						Vue.prototype.CustomBar = e.statusBarHeight + 50;
					} else {
						Vue.prototype.CustomBar = e.statusBarHeight + 45;
					};
					// #endif

					// #ifdef MP-WEIXIN
					Vue.prototype.StatusBar = e.statusBarHeight;
					let custom = wx.getMenuButtonBoundingClientRect();
					Vue.prototype.Custom = custom;
					Vue.prototype.CustomBar = custom.bottom + custom.top - e.statusBarHeight + 4;
					// #endif		

					// #ifdef MP-ALIPAY
					Vue.prototype.StatusBar = e.statusBarHeight;
					Vue.prototype.CustomBar = e.statusBarHeight + e.titleBarHeight;
					// #endif
				}
			});
		},
		onShow: function() {
			console.log('App Show')
		},
		onHide: function() {
			console.log('App Hide')
		}
	}
</script>

<style lang="scss">
</style>

3. pages.json 配置自定义

"pages": [{
	"path": "home",
	"style": {
		"navigationStyle": "custom"
	}
}]

4. 顶部导航栏 使用

1. 组件完整代码（CSS 部分 我使用的是 colorUI ，不懂的可以看看写法）

<template>
	<view>
		<view class="cu-custom" :style="[{height:CustomBar + 'px'}]">
			<view class="cu-bar fixed" :style="style" :class="[bgImage!=''?'none-bg text-white bg-img':'',bgColor]">
				<view class="action" @tap="BackPage" v-if="isBack">
					<text class="cuIcon-back"></text>
					<slot name="backText"></slot>
				</view>
				<view class="content" :style="[{top:StatusBar + 'px'}]">
					<slot name="content"></slot>
				</view>
				<slot name="right"></slot>
			</view>
		</view>
	</view>
</template>

<script>
	export default {
		data() {
			return {
				StatusBar: this.StatusBar,
				CustomBar: this.CustomBar
			};
		},
		name: 'cu-custom',
		computed: {
			style() {
				var StatusBar = this.StatusBar;
				var CustomBar = this.CustomBar;
				var bgImage = this.bgImage;
				var style = `height:${CustomBar}px;padding-top:${StatusBar}px;`;
				if (this.bgImage) {
					style = `${style}background-image:url(${bgImage});`;
				}
				return style
			}
		},
		props: {
			bgColor: {
				type: String,
				default: ''
			},
			isBack: {
				type: [Boolean, String],
				default: false
			},
			bgImage: {
				type: String,
				default: ''
			},
		},
		methods: {
			BackPage() {
				uni.navigateBack({
					delta: 1
				});
			}
		}
	}
</script>

<style lang="scss" scoped>
</style>

2. main.js 全局注册顶部导航栏组件

// 此处为引用自定义顶部
import cuCustom from './colorui/components/cu-custom.vue'
Vue.component('cu-custom',cuCustom);

3. 页面使用导航栏组件

<cu-custom class="navBox" bgColor="bg-gradual-blue" :isBack="true">
	<block slot="backText">返回</block>
	<block slot="content">首页</block>
</cu-custom>