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uniapp+vue3中使用swiper和自定义header实现左右滑动的Tabs功能

发布时间 2023-11-24 09:34:06作者: 乌拉小考

首先创建一个Tabs的Header，包含有一个下划线的指示器，在点击tabs的标题时候下划线会跟着动态的滑动
下面是完整的Tabs的代码，可以看到定义了Tabs的background颜色样式，包含tab的宽度indicatorWidth，以及下划线的颜色indicatorColor
主要的是tabList属性，通过tabList传入对应的tab数组得到tabs的头部。在点击的时候因为下划线添加了

<template>
  <view>
    <view class="tabs" :style="{ background: props.background ? props.background : '#ffffff' }">
      <view class="tabs__header flex-center">
        <view class="tabs__header-item">
          <view
            v-for="(tab, index) in props.tabList"
            :key="index"
            class="tab-item"
            @click="handleTabClick(index)">
            <view class="tab-item-title" :class="state.currentIndex === index ? 'active' : ''">{{ tab.title }}</view>
          </view>
        </view>
      </view>
      <view class="indicator" ref="indicatorRef"></view>
    </view>
  </view>
</template>

<script setup lang="ts">
import { computed, onMounted, reactive, ref } from "vue"

const emit = defineEmits(["tabClick"])

interface WsTabsOption {
  tabList: AnyObject[]
  background: string
  indicatorColor: string
  indicatorWidth: number
}

interface State {
  currentIndex: number
}

const props = defineProps<WsTabsOption>()

const indicatorRef = ref()

const state = reactive<State>({
  currentIndex: 0
})

const indicatorColor = ref("#0e81ff")
const indicatorWidthValue = ref(10)
const indicatorWidth = computed(() => {
  return indicatorWidthValue.value + "vw"
})
const indicatorLeftValue = ref(0)
const indicatorLeft = computed(() => {
  return indicatorLeftValue.value + "vw"
})

// 更换tab
const changeTab = (index: number) => {
  state.currentIndex = index
  changeTabIndicatorLeft(index)
}

onMounted(() => {
  indicatorColor.value = props.indicatorColor ? props.indicatorColor : "#0e81ff"
  indicatorWidthValue.value = props.indicatorWidth ? props.indicatorWidth : 10
  changeTabIndicatorLeft(0)
})

// 更改indicator的位置
const changeTabIndicatorLeft = (index: number) => {
  if (props.tabList && props.tabList.length) {
    let tabWidth = 100 / props.tabList.length
    let startLeft = index * tabWidth
    let tabWidthCenter = tabWidth / 2
    let indicatorWidthCenter = indicatorWidthValue.value / 2
    let leftValue = startLeft + (tabWidthCenter - indicatorWidthCenter)
    indicatorLeftValue.value = leftValue
    console.log("left value " + startLeft + " # " + leftValue)
  }
}

// 点击tab
const handleTabClick = (index: number) => {
  state.currentIndex = index
  emit("tabClick", index)
}
// 暴露changeTab方法，当swiper更改的时候来更改tabs的header位置
defineExpose({ changeTab })
</script>

<style lang="scss">
page {
  background: #f5f5f5;
}

.tabs {
  display: flex;
  flex-direction: column;
  flex: 1;
  height: 100%;
  background: #0e81ff;

  &__header {
    font-size: medium;
    color: grey;
    overflow: scroll;
    display: flex;
    flex-direction: row;

    &::-webkit-scrollbar {
      display: none; /* Chrome Safari */
    }

    &-item {
      /*解决ios上滑动不流畅*/
      -webkit-overflow-scrolling: touch;
      white-space: nowrap; /* 合并空白和回车 */
      flex: none;
      scrollbar-width: none; /* Firefox */
      -ms-overflow-style: none; /* IE 10+ */
      text-align: center;
      margin: 0 auto;
      width: 100%;
      display: flex;
      flex-direction: row;
    }

    .tab-item {
      display: inline-block;
      text-align: center;
      margin: 10px 10px 5px 10px;
      cursor: pointer;
      flex: 1;
    }
  }

  &__content {
    &-box {
      position: relative;
      width: 100%;
      height: 100%;
      min-height: 280rpx;
      display: flex;
      flex-flow: nowrap;
      transition: left 0.5s;
    }
  }
}

.tab-item-title {
  color: #000000;
  font-size: 32rpx;
  opacity: 0.6;
  font-weight: 500;
}

.active {
  color: #000000;
  font-size: 32rpx;
  opacity: 1;
  font-weight: bold;
}

.indicator {
  bottom: 0;
  position: relative;
  width: v-bind(indicatorWidth);
  height: 4rpx;
  border: 1px solid v-bind(indicatorColor);
  background-color: v-bind(indicatorColor);
  transition: left 0.5s;
  left: v-bind(indicatorLeft);
}
</style>

上面是Tabs的header完整代码，下面开始看看怎么和uniapp的swiper进行联动。
利用swiper的current参数创建一个当前页面属性的值，然后通过赋值currentPage来对swiper的页面进行代码控制。
当swiper的页面更改触发@change方法的时候同步设置Tabs的header位置

<template>
  <view class="page-wrapper">
    <ws-tabs ref="tabsHeaderRef" :tabList="state.tabList" @tabClick="handleClickTab" :indicatorWidth="10"></ws-tabs>
    <view style="flex: 1">
      <swiper class="swiper" :autoplay="false" ref="swiperRef" :current="currentPage" @change="handleSwiperChange">
        <swiper-item>
          <view class="swiper__item">
            页面1
          </view>
        </swiper-item>
        <swiper-item>
          <view class="swiper__item">
            页面2
          </view>
        </swiper-item>
        <swiper-item>
          <view class="swiper__item">
            页面3
          </view>
        </swiper-item>
      </swiper>
    </view>
  </view>
</template>

<script setup lang="ts">
import { reactive, ref } from "vue"
import WsTabs from "../components/ws-tabs.vue"

interface State {
  loading: boolean
  tabList: AnyObject[]
}

const state = reactive<State>({
  loading: false,
  tabList: [{ title: "页面1" }, { title: "页面2" }, { title: "页面3" }]
})

const tabsHeaderRef = ref()
const swiperRef = ref()
const currentPage = ref(0)

const handleClickTab = index => {
  currentPage.value = index
}

const handleSwiperChange = (e: AnyObject) => {
  tabsHeaderRef.value.changeTab(e.detail.current)
}
</script>

<style lang="scss">
.page-wrapper {
  display: flex;
  flex: 1;
  flex-direction: column;
  height: calc(100vh - 88rpx);
}

page {
  background: #f5f5f5;
}

.swiper {
  display: flex;
  flex-direction: column;
  height: 100%;
}

.upload-button {
  background: rgba(12, 127, 252, 0.15);
  border-radius: $uni-border-radius-base;
  margin-top: 30rpx;
  color: #0c7ffc;
  font-size: 34rpx;
  font-weight: 500;
}

.radio-button {
  color: black;
  flex: 1;
  margin-top: 20rpx;
  background: #f5f5f5;
  padding: 20rpx;
  height: 40rpx;
  font-size: 28rpx;
  border-radius: $uni-border-radius-base;
  border: 2rpx solid #f5f5f5;
  font-weight: 500;

  view:nth-child(1) {
    margin-left: 40rpx;
  }
}
</style>