uni-app 淡化轮播插件

在uni-app中实现淡化轮播效果，可以通过自定义swiper组件并应用CSS动画来实现。以下是一个简单的代码示例，展示如何在uni-app中实现淡化轮播插件。

1. 创建自定义组件 fade-swiper.vue

<template>
  <view class="fade-swiper-container">
    <swiper
      class="swiper"
      :autoplay="autoplay"
      :interval="interval"
      :duration="duration"
      circular
      indicator-dots="false"
    >
      <swiper-item v-for="(item, index) in items" :key="index">
        <view class="swiper-item fade-animation" :style="{ opacity: isActive(index) ? 1 : 0 }">
          <slot :name="'item' + index">{{ item }}</slot>
        </view>
      </swiper-item>
    </swiper>
  </view>
</template>

<script>
export default {
  props: {
    items: {
      type: Array,
      required: true
    },
    autoplay: {
      type: Boolean,
      default: true
    },
    interval: {
      type: Number,
      default: 3000
    },
    duration: {
      type: Number,
      default: 500
    }
  },
  data() {
    return {
      currentIndex: 0
    };
  },
  watch: {
    currentIndex(newIndex) {
      this.$emit('change', newIndex);
    }
  },
  methods: {
    isActive(index) {
      return this.currentIndex === index;
    },
    onSwiperChange(event) {
      this.currentIndex = event.detail.current;
    }
  },
  mounted() {
    this.$refs.swiper.addEventListener('change', this.onSwiperChange);
  },
  beforeDestroy() {
    this.$refs.swiper.removeEventListener('change', this.onSwiperChange);
  }
};
</script>

<style scoped>
.fade-swiper-container {
  width: 100%;
  height: 100%;
}
.swiper-item {
  position: absolute;
  width: 100%;
  height: 100%;
  transition: opacity 0.5s ease-in-out;
}
.fade-animation {
  position: relative;
}
</style>

2. 使用自定义组件

<template>
  <view>
    <fade-swiper :items="images" @change="onSwiperChange">
      <template v-slot:item0>
        <image src="/static/image1.jpg" mode="aspectFill" style="width: 100%; height: 100%;"></image>
      </template>
      <template v-slot:item1>
        <image src="/static/image2.jpg" mode="aspectFill" style="width: 100%; height: 100%;"></image>
      </template>
      <!-- Add more slots as needed -->
    </fade-swiper>
  </view>
</template>

<script>
import FadeSwiper from '@/components/fade-swiper.vue';

export default {
  components: {
    FadeSwiper
  },
  data() {
    return {
      images: ['Image 1', 'Image 2'] // Replace with actual image data or URLs
    };
  },
  methods: {
    onSwiperChange(index) {
      console.log('Swiper changed to index:', index);
    }
  }
};
</script>

以上代码展示了如何在uni-app中实现一个简单的淡化轮播插件。你可以根据实际需求进一步调整和优化。