一个项目有多个角色，比如医生和患者，tabBar跳转的路径不一样，但是在pages.json中无法配置多个tabBar，这时候就要自定义tabBar了

下面一个小小demo，场景是医生和患者端，一共四个不同的页面，分别是医生首页，患者首页，医生我的页面，患者我的页面，tabbar要求根据不同的角色跳转到对应的路径

（一）配置pages.json

[scode type=“red”]custom设置为true，并且把所有需要切换的页面都配置在list中，否则之后切换tab用switchTab方法无效[/scode]

 "tabBar": {
		"custom": true, 
		"color": "#333333",
		"selectedColor": "#4256A8",
		"borderStyle": "black",
		"backgroundColor": "#ffffff",
		"list": [{
				"pagePath": "pages/patientHome/patientHome",
				"iconPath": "static/images/home.png",
				"selectedIconPath": "static/images/home_s.png",
				"text": "首页"
			},
			{
				"pagePath": "pages/mine/mine",
				"iconPath": "static/images/mine.png",
				"selectedIconPath": "static/images/mine_s.png",
				"text": "我的"
			},
            {
				"pagePath": "pages/doctorDine/doctorDine",
				"iconPath": "static/images/mine.png",
				"selectedIconPath": "static/images/mine_s.png",
				"text": "我的"
			},
			{
				"pagePath": "pages/volunteerHome/volunteerHome",
				"iconPath": "static/images/mine.png",
				"selectedIconPath": "static/images/home_s.png",
				"text": "首页"
			},
			{
				"pagePath": "pages/pharmacyHome/pharmacyHome",
				"iconPath": "static/images/mine.png",
				"selectedIconPath": "static/images/home_s.png",
				"text": "首页"
			}
		]
	}

##（二）tab-bar.vue 组件

  <template>
	<view class="tab-bar">
		<view v-for="(item,index) in list" :key="index" class="tab-bar-item" @click="switchTab(item, index)">
			<image class="tab_img" :src="selected === index ? item.selectedIconPath : item.iconPath"></image>
			<view class="tab_text" :style="{color: selected === index ? selectedColor : color}">{{item.text}}</view>
		</view>
	</view>
 
</template>
 
 
 
<script>
	export default {
		props: {
			selected: { // 当前选中的tab index
				type: Number,
				default: 0
			},
			userIdentity: { // 当前角色
				type: Number,
				default: 0
			}
 
		},
		data() {
			return {
				color: "#333333",
				selectedColor: "#333333",
				list: [{
					pagePath: "/pages/patientHome/patientHome",
					iconPath: "/static/images/home.png",
					selectedIconPath: "/static/images/home_s.png",
					text: "首页"
				}, {
					pagePath: "/pages/mine/mine",
					iconPath: "/static/images/mine.png",
					selectedIconPath: "/static/images/mine_s.png",
					text: "我的"
				}]
			}
		},
		methods: {
			switchTab(item, index) {
				console.log("item", item)
				console.log("index", index)
				let url = item.pagePath;
                // 对应患者和医生的首页
				if (index == 0) {
					switch (this.userIdentity) {
						// 患者
						case 0:
							url = "/pages/patientHome/patientHome"
							break
						// 医生
						case 1:
							url = "/pages/doctorHome/doctorHome"
							break
					}
 
				}
                // 对应患者和医生的我的页面
				if (index == 1) {
					switch (this.userIdentity) {
						// 患者
						case 0:
							url = "/pages/mine/mine"
							break
						// 医生
						case 1:
							url = "/pages/doctorMine/doctorMine"
							break
					}
 
				}
				uni.switchTab({
					url
				})
 
			}
		}
	}
</script>
 
<style lang="scss">
	.tab-bar {
		position: fixed;
		bottom: 0;
		left: 0;
		right: 0;
		height: 100rpx;
		background: white;
		display: flex;
		justify-content: center;
		align-items: center;
		padding-bottom: env(safe-area-inset-bottom); // 适配iphoneX的底部
 
		.tab-bar-item {
			flex: 1;
			text-align: center;
			display: flex;
			justify-content: center;
			align-items: center;
			flex-direction: column;
 
			.tab_img {
				width: 37rpx;
				height: 41rpx;
			}
 
			.tab_text {
				font-size: 20rpx;
				margin-top: 9rpx;
			}
		}
	}
</style>

（三）不同的角色调用tabBar

医生端：

<tab-bar :userIdentity="1"></tab-bar>

患者端：

<tab-bar :userIdentity="0"></tab-bar>

我的页面：

<tab-bar :selected="1"></tab-bar>

组件还有很多可扩展的地方，因为demo中tabBar的差异仅是跳转路径不同，所以对index做判断从而做特殊处理即可，

还有一些不同页面tabBar差异较大的场景，可以考虑根据不同的角色获取不同的tabBar list