scroll-view {

 height: 100vh;

}

<view class="box"> 
 <view class="box-head"></view>
 <scroll-view class="box-scroll"></scroll-view> 
</view>

.box {
 display: flex;
 flex-direction:column;
 height:100vh;
 overflow:hidden;
}
.box-head {
 flex-shrink: 0;
 height: 50px;
}
.box-scroll {
 flex: 1;
 height: 1px;
}

<scroll-view
 class="list-scroll {{ autoHeight "
 scroll-y
 enable-back-to-top
 bind:scrolltolower="scrolltolower"
>
 <slot></slot>

 <!-- 加载完成 -->
 <view wx:if="{{ finished }}" class="list-loading">
  <view class="list-loading__text">{{ finishedText }}</view>
 </view>

 <!-- 加载效果 -->
 <view wx:elif="{{ loading }}" class="list-loading">
  <van-loading type="spinner" size="20"></van-loading>
 </view>
</scroll-view>

.list {
 &-scroll {
  flex: 1;
  height: 100vh;

  &--auto {
   height: 1px;
  }
 }

 &-loading {
  margin: 10px 0;
  text-align: center;

  &__text {
   font-size: 16px;
   color: #a6a6a6;
   line-height: 1;
  }
 }
}

// components/list/list.js
Component({
 externalClasses: ["class"],
 options: {
  virtualHost: true, // 组件虚拟化
 },

 /**
  * 组件的属性列表
  */
 properties: {
  // 加载状态
  loading: {
   type: Boolean,
   value: false,
  },
  // 加载完成
  finished: {
   type: Boolean,
   value: false,
  },
  // 加载完成文字
  finishedText: {
   type: String,
   value: "没有更多了",
  },
  // 自动初始化获取数据
  autoInit: {
   type: Boolean,
   value: true,
  },
  // flex自定适应高度
  autoHeight: {
   type: Boolean,
   value: false,
  },
 },

 /**
  * 组件的方法列表
  */
 methods: {
  /**
   * 滚动到底部阈值
   */
  scrolltolower() {
   // 退出执行
   if (
    this.data.emptyText || // 没有数据
    this.data.loading || // 正在加载
    this.data.finished // 加载完成
   ) {
    return;
   }

   this.setData({
    loading: true,
   });
   this.triggerEvent("load");
  },
 },

 /**
  * 组件声明周期
  */
 lifetimes: {
  attached() {
   // 自动初始化
   if (this.data.autoInit) {
    this.scrolltolower();
   }
  },
 },
});

"component": true,
 "usingComponents": {
  "van-loading": "@vant/weapp/loading/index"
 }

<com-list></com-list>

<com-list auto-height></com-list>