uni-app底部导航栏的设计和动画效果

<template>
  <view class="content">
    <view class="page" :class="{'active': current === 0}">页面1</view>
    <view class="page" :class="{'active': current === 1}">页面2</view>
    <view class="page" :class="{'active': current === 2}">页面3</view>
    <view class="tabbar">
      <view class="tab-item" v-for="(item, index) in tabItems" :key="index" @click="switchTab(index)">
        <view class="tab-icon" :class="{'active': current === index}">{{ item.icon }}</view>
        <view class="tab-text" :class="{'active': current === index}">{{ item.text }}</view>
      </view>
    </view>
  </view>
</template>

<script>
export default {
  data() {
    return {
      current: 0,
      tabItems: [
        { icon: '?', text: '首页' },
        { icon: '?', text: '发现' },
        { icon: '?', text: '我的' }
      ]
    }
  },
  methods: {
    switchTab(index) {
      this.current = index;
      // 这里可以添加更多的动画逻辑
    }
  }
}
</script>

<style>
.content {
  height: 100vh;
  display: flex;
  flex-direction: column;
}

.page {
  flex: 1;
  display: none;
  transition: opacity 0.3s ease;
  opacity: 0;
}

.page.active {
  display: block;
  opacity: 1;
}

.tabbar {
  height: 50px;
  background-color: #f8f8f8;
  display: flex;
  justify-content: space-around;
  align-items: center;
  border-top: 1px solid #e0e0e0;
}

.tab-item {
  text-align: center;
}

.tab-icon {
  font-size: 24px;
  transition: color 0.3s ease;
}

.tab-text {
  font-size: 12px;
  transition: color 0.3s ease;
}

.tab-icon.active, .tab-text.active {
  color: #007AFF;
}
</style>