微信小程序之tabBar（官方原生与官方自定义）

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"tabBar": {
    "color": "#ff0000", //颜色
    "selectedColor": "#ffff00",    //选中时的颜色
    "backgroundColor": "#1697eb",  //tab背景色
    "borderStyle": "black",  //tabBar盒子上面的border颜色，只支持black 与 white
    "list": [
      {
        "pagePath": "pages/tabOne/tabOne", //此处路径要写不带 ‘/’的
        "text": "tabOne",            //tab名字
        "iconPath": "image/icon_API.png",  //tab图标
        "selectedIconPath": "image/icon_API_HL.png" //选中时的tab图标
      },
      {
        "pagePath": "pages/tabTwo/tabTwo",
        "text": "tabTwo",
        "iconPath": "image/icon_API.png",
        "selectedIconPath": "image/icon_API_HL.png"
      },
      {
        "pagePath": "pages/tabThree/tabThree",
        "text": "tabThree",
        "iconPath": "image/icon_API.png",
        "selectedIconPath": "image/icon_API_HL.png"
      },
    ],
    "position": "bottom",  //tabBar的位置 top 或 bottom
    "custom": false  //自定义tabBar时为true
  }

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 "tabBar": {
    "custom": true,
    "position": "top",
    "list": [
      {
        "pagePath": "pages/index/index"
      },
      {
        "pagePath": "pages/message/message"
      },
      {
        "pagePath": "pages/goal/goal"
      }
    ]
  },

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Component({
  data: {
    selected: 0,
    color: "#ffffff",
    selectedColor: "#c97587",
    "list": [
      {
        "pagePath": "/pages/index/index",
        "text": "❤️",
        "iconPath": "",
        "selectedIconPath": ""
      },
      {
        "pagePath": "/pages/message/message",
        "text": "💌",
        "iconPath": "",
        "selectedIconPath": ""
      },
      {
        "pagePath": "/pages/goal/goal",
        "text": "📝",
        "iconPath": "",
        "selectedIconPath": ""
      },
    ],
  },
  attached() {
  },
  methods: {
    switchTab(e) {
      const data = e.currentTarget.dataset
      const url = data.path
      //切换tab时，改变路由地址
      wx.switchTab({url})
      this.setData({
        //切换tab时，改变当前激活的序号，改变tab颜色图标等样式  
        selected: data.index
      })
    }
  }
})

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{
  "component": true
}

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<!--custom-tab-bar/index.wxml-->
<cover-view class="tab-bar">
  <cover-view class="tab-bar-border"></cover-view>
  <cover-view wx:for="{{list}}" wx:key="index" class="tab-bar-item" style="background-color: {{selected === index ? selectedColor : color}}" data-path="{{item.pagePath}}" data-index="{{index}}" bindtap="switchTab">
    <!--<cover-image src="{{selected === index ? item.selectedIconPath : item.iconPath}}"></cover-image>-->
    <cover-view>{{item.text}}</cover-view>
  </cover-view>
</cover-view>

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.tab-bar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 60rpx;
  background: white;
  display: flex;
  padding-bottom: env(safe-area-inset-bottom);
}

.tab-bar-border {
  background-color: white;
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 1px;
  transform: scaleY(0.5);
}

.tab-bar-item {
  flex: 1;
  text-align: center;
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
}

.tab-bar-item cover-image {
  width: 27px;
  height: 27px;
}

.tab-bar-item cover-view {
  font-size: 30rpx;
}

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{
  "usingComponents": {},
  "navigationBarBackgroundColor": "#ffffff",
  "navigationBarTitleText": "📝",
  "navigationBarTextStyle": "black"
 
}

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onShow: function () {
    if (typeof this.getTabBar === 'function' &&
      this.getTabBar()) {
      this.getTabBar().setData({
        //就是页面显示出来后，让相应的tab改变颜色 图标等样式
        selected: 3 // 根据tab的索引值设置
      })
    }
  },