微信小程序 自定义 Tab custom-tab-bar 点击刷新,回到首页

前言:

微信项目中需要做个二维码的功能,显示的时候要突出出来,So, 只能自定义了,先看一下我们要做成这个样子,看到这个阴影是不是有点恐慌,不要怕,很简单

一、修改 app.json 文件,将 tabBar修改为自定义tab,list 保持不变,最多5个

  "tabBar": {
    "selectedColor": "#FB7F32",
    "borderStyle": "white",
    "custom": true, // 自定义tab
    "usingComponents": {},
   "list": [ { "pagePath": "pages/Home/index", "iconPath": "image/home.png", "selectedIconPath": "image/homeActive.png", "text": "组件" }, { "pagePath": "pages/Message/index", "iconPath": "image/message.png", "selectedIconPath": "image/messageActive.png", "text": "消息中心" }, { "pagePath": "pages/Home/index", "iconPath": "image/qrCode.png", "selectedIconPath": "image/qrCode.png", "text": "" }, { "pagePath": "pages/Home/index", "iconPath": "image/order.png", "selectedIconPath": "image/orderActive.png", "text": "订单" }, { "pagePath": "pages/Home/index", "iconPath": "image/mine.png", "selectedIconPath": "image/mineActive.png", "text": "我的" } ]

  

二、在项目的根目录新建 custom-tab-bar,这个文件就是微信已经帮我们定义好了,只需要新增文件,就可以微信自动读取

三、custom-tab-bar/index.wxml 写入,官网中提供,使用 cover-view 标签来操作,目前我这边是使用view,因为  cover-view 在向上滑动的时候,会带着tab 一起拖上去,不太好看,

 

<view class="tab-bar" style="background: url('{{background}}') no-repeat; background-size: 100% auto">
  <view wx:for="{{list}}" wx:key="index" class="tab-bar-item" data-path="{{item.pagePath}}" data-index="{{index}}" bindtap="switchTab" >
    <view class="center_part" >
      <view class="center_part_code" wx:if="{{item.isSpecial}}">
        <image class=" center-has-noimg" src="../image/qrCode.png" ></image>
      </view>
      <image class=" center-has-image" src="{{selected%20===%20index%20?%20item.selectedIconPath%20:%20item.iconPath}}" wx:else></image>
    </view>
    <view style="color: {{selected === index ? selectedColor : color}}" class="cover-text">{{item.text}}</view>
  </view>
</view>

  

四、custom-tab-bar/index.js 写入

const app = getApp()

Component({
  data: {
    selected: 0, // 目前tab所在的index 
    color: "#999", // 未选中颜色
    selectedColor: "#D0021B", // 选中颜色
  // tab 自定义配置需与index.json 保持一致 list: [{ pagePath: "/pages/Home/index", iconPath: "../image/home.png", selectedIconPath: "../image/homeActive.png", text: "首页", isSpecial: false }, { pagePath: "/pages/Message/index", iconPath: "../image/message.png", selectedIconPath: "../image/messageActive.png", text: "消息中心", isSpecial: false }, { pagePath: "/pages/pay/index", iconPath: "image/icon_API.png", selectedIconPath: "image/icon_API_HL.png", text: "", isSpecial: true }, { pagePath: "/index/index2", iconPath: "../image/order.png", selectedIconPath: "../image/orderActive.png", text: "历史订单", isSpecial: false }, { pagePath: "/index/index2", iconPath: "../image/mine.png", selectedIconPath: "../image/mineActive.png", text: "我的", isSpecial: false }], }, methods: {
  // 切换 tab 事件 switchTab(e) { let that = this const idx = e.currentTarget.dataset.index const path = e.currentTarget.dataset.path // 跳转页面 wx.switchTab({ url: path, }) that.setData({ selected: idx }) } } })

  

五、custom-tab-bar/index.wxss 写入

.tab-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: 90rpx;
  display: flex;
  padding-bottom: env(safe-area-inset-bottom);
  z-index: 99;
  position: relative;
  padding-top: 17rpx;
}
 
.tab-bar-item {
  flex: 1;
  text-align: center;
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
}
 
.tab-bar-item cover-image {
   27px;
  height: 27px;
}
 
.tab-bar-item .cover-text {
  font-size: 10px;
}
.txt{
  color: #aaaaaa;
}
.fontWeight{
  font-weight: bold;
}
.bg_rec{
  background: #ffd324;
   80rpx;
  min-height: auto;
  height: 20rpx;
  margin-top: -28rpx;
  vertical-align: text-bottom;
  border-radius: 0;
  z-index: -10;
}
.center_img{
   100rpx;
  height: 100rpx;
  transform: translate(-50%);
  left: 50%;
  bottom:0;
}
.center-has-noimg{
   100%;
  height: 100%;
}
.center-has-image{
   35rpx;
  height: 35rpx;  
}
.center_part_code{
  padding: 10rpx;
  box-shadow: 0 0 0 #000;
  /*  100rpx;
  height: 100rpx; */
  position: absolute;
  top: -30px;
  z-index: 10;
   106rpx;
  height: 106rpx;
  transform: translate(-50%);
  left: 50%;
}

  

六、查看效果

发现:view 一直定在下部,滑动的时候不太好看,我这边在 每个switchTab页面的json 中配置了,禁止滚动,在页面内给 父级设置 overflow: scroll,( switchtab页面为tabBar 中list 配置的页面)

七、总结问题

1. 进入首页,点击其他tab,页面会刷新,tabindex 会再次回到首页

  解决方案:在每个 switchtab页面 中写入以下 ,( switchtab页面为tabBar 中list 配置的页面)

  onShow:function (params) {
    if (typeof this.getTabBar === 'function' && this.getTabBar()) {
      this.getTabBar().setData({
        selected: 0  // 数字是当前页面在tabbar的索引,如我的查询页索引是2,因此这边为2,同理首页就为0,消息中心页面为1
      })
    }
  },

  

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