实现效果

拖拽子组件代码

<template>
  <ul class="m-drag" :style="{ height: itemHeight * newList.length + 'px' }">
    <li
      v-for="(item, index) in newList"
      :key="index"
      class="m-drag-item"
      :class="{ active: currentIndex === index }"
      :style="{
        top: itemYList[index].top + 'px',
      }"
    >
      <slot :item="item" />
      <!-- css实现拖拽图标 -->
      <div
        class="icon"
        @touchstart="touchStart($event, index)"
        @touchmove="touchMove"
        @touchend="touchEnd"
      >
        <i class="lines" />
      </div>
    </li>
  </ul>
</template>
<script>
export default {
  props: {
    // 每一项item高度，必须
    itemHeight: {
      type: Number,
      required: true,
    },
    // 数据列表，必须
    list: {
      type: Array,
      required: true,
    },
    // 是否只读
    readonly: {
      type: Boolean,
      default: false,
    },
  },
  data() {
    return {
      // 数据
      newList: [],
      // 初始数据
      initialList: [],
      // 记录所有item的初始坐标
      initialItemYList: [],
      // 坐标数据
      itemYList: [],
      // 记录当前手指的垂直方向的坐标
      touchY: 0,
      // 记录当前操作的item数据
      currentItemY: {},
      // 当前操作的item的下标
      currentIndex: -1,
    };
  },
  watch: {
    list: {
      handler(val) {
        if (!val?.length) return;
        // 获取数据列表
        this.newList = val;
        // 记录初始数据
        this.initialList = [...val];
        // 获取所有item的初始坐标
        this.initialItemYList = this.getItemsY();
        // 初始化坐标
        this.itemYList = this.getItemsY();
      },
      immediate: true,
    },
  },
  created() {},
  methods: {
    /** @初始化各个item的坐标 **/
    getItemsY() {
      return this.list.map((item, i) => {
        return {
          top: i * this.itemHeight,
        };
      });
    },
    /** @开始触摸 */
    touchStart(event, index) {
      // 只读
      if (this.readonly) return;
      // H5拖拽时，禁止触发ios回弹
      this.h5BodyScroll(false);
      const [{ pageY }] = event.touches;

      // 记录数据
      this.currentIndex = index;
      this.touchY = pageY;
      this.currentItemY = this.itemYList[index];
    },
    /** @手指滑动 **/
    touchMove(event) {
      // 只读
      if (this.readonly) return;
      const [{ pageY }] = event.touches;
      const current = this.itemYList[this.currentIndex];
      const prep = this.itemYList[this.currentIndex - 1];
      const next = this.itemYList[this.currentIndex + 1];
      // 获取移动差值
      this.itemYList[this.currentIndex] = {
        top: current.top + (pageY - this.touchY),
      };
      // 记录手指坐标
      this.touchY = pageY;
      // 向下移动（超过下一个的1/2就进行换位）
      if (next && current.top > next.top - this.itemHeight / 2) {
        this.changePosition(this.currentIndex + 1);
      } else if (prep && current.top < prep.top + this.itemHeight / 2) {
        // 向上移动（超过上一个的1/2就进行换位）
        this.changePosition(this.currentIndex - 1);
      }
    },
    /** @手指松开 */
    touchEnd() {
      // 只读
      if (this.readonly) return;
      // 触发change
      this.change();
      // 将拖拽的item归位
      this.itemYList[this.currentIndex] =
        this.initialItemYList[this.currentIndex];
      this.initialList = [...this.newList];
      this.currentIndex = -1;
      // H5开启ios回弹
      this.h5BodyScroll(true);
    },
    /** @交换位置 **/
    // index 需要与第几个下标交换位置
    changePosition(index) {
      // 记录当前拖拽的item数据
      const tempItem = this.newList[this.currentIndex];
      // 设置原来位置的item
      this.newList[this.currentIndex] = this.newList[index];
      // 将临时存放的数据设置好
      this.newList[index] = tempItem;

      // 调整位置item
      this.itemYList[index] = this.itemYList[this.currentIndex];
      this.itemYList[this.currentIndex] = this.currentItemY;

      // 改变当前操作的的下标
      this.currentIndex = index;

      // 记录新位置的数据
      this.currentItemY = this.initialItemYList[this.currentIndex];
    },
    /** @回传数据 **/
    change() {
      // 如果顺序未发生改变，则不触发change事件
      if (JSON.stringify(this.newList) == JSON.stringify(this.initialList))
        return;
      // 传给父组件新数据
      this.$emit("change", this.newList, this.newList[this.currentIndex]);
    },
    // h5 ios回弹
    h5BodyScroll(flag) {
      // #ifdef H5
      document.body.style.overflow = flag ? "initial" : "hidden";
      // #endif
    },
  },
};
</script>
<style scoped lang="scss">
.m-drag {
  position: relative;
  width: 100%;
  overflow: auto;

  ::-webkit-scrollbar {
    display: none;
  }
  .m-drag-item {
    position: absolute;
    left: 0;
    right: 0;
    transition: all ease 0.25s;
    display: flex;
    align-items: center;
    font-size: 28rpx;
    padding: 30rpx 0;
    border-bottom: 1px solid #f5f5f5;
    :last-child{
        border-bottom: 0;  
    }

    > :deep(*:not(.icon)) {
      flex: 1;
    }

    .icon {
      padding: 10rpx;

      .lines {
        background: #000;
        width: 20px;
        height: 1px;
        border-radius: 100rpx;
        margin-left: auto;
        position: relative;
        display: block;
        transition: all ease 0.25s;

        &::before,
        &::after {
          position: absolute;
          width: inherit;
          height: inherit;
          border-radius: inherit;
          background: #000;
          transition: inherit;
          content: "";
          display: block;
        }

        &::before {
          top: -14rpx;
        }

        &::after {
          bottom: -14rpx;
        }
      }
    }

    // 拖拽中的元素，添加阴影、关闭动画、层级置顶
    &.active {
      box-shadow: 0 0 14rpx rgba(0, 0, 0, 0.08);
      transition: initial;
      z-index: 1;

      .icon .lines {
        background: #2e97f9;

        &::before,
        &::after {
          background: #2e97f9;
        }
      }
    }
  }
}
</style>

组件使用

<template>
  <view class="deduction_list">
    <Mdrag :item-height="50" :list="list" @change="dragComplete">
      <template #default="{ item }">
        <span class="name">{{ item.name }}</span>
      </template>
    </Mdrag>
  </view>
</template>

<script>
import Mdrag from "./Mdrag.vue";
export default {
  name: "sss",
  components: { Mdrag },

  data() {
    return {
      list: [
        {
          name: "支付宝",
        },
        {
          name: "微信",
        },
        {
          name: "银行卡",
        },
      ],
    };
  },

  mounted() {},

  methods: {
    dragComplete(newList, dragItem) {
      console.log(newList, dragItem);
    },
  },
};
</script>

兼容ios-app-微信小程序 回弹问题

	{
			"path": "pages/deductionOrder/index",
			"style": {
				"navigationBarBackgroundColor":"#FFFFFF",
				"navigationBarTitleText":"扣款顺序",
				"disabledScroll": true,
				"allowsBounceVertical": "NO",
				"app-plus": {
					"bounce": "none"
				  }
			}
		}