uView（u-collapse）折叠 展开 高度问题 无法撑开 nextTick

<u-collapse ref="myCollapse" @change="change" accordion>
      <u-collapse-item v-for="(level,index) in levelList" :key="index" :title="level.name" ref="collapseHeight">
        <view class="">
          <view v-for="(film,i) in filmList" :key="i" class="u-p-20">
            {{film.name}}
          </view>
        </view>
      </u-collapse-item>
    </u-collapse>

async change(list) {
        const index = list.findIndex((item) => {
          return item.status === 'open'
        })
        if (index === -1) {
          return
        }
        this.filmList = await this.getFilmData(index + 1)
        this.$nextTick(() => {
          this.$refs.myCollapse.init();
        })
      },

// 异步获取内容，或者动态修改了内容时，需要重新初始化
      init() {
        // 初始化数据
        this.updateParentData()
        if (!this.parent) {
          return uni.$u.error('u-collapse-item必须要搭配u-collapse组件使用')
        }
        const {
          value,
          accordion,
          children = []
        } = this.parent
        if (accordion) {
          if (uni.$u.test.array(value)) {
            return uni.$u.error('手风琴模式下，u-collapse组件的value参数不能为数组')
          }
          // this.expanded = this.name == value
        } else {
          if (!uni.$u.test.array(value) && value !== null) {
            return uni.$u.error('非手风琴模式下，u-collapse组件的value参数必须为数组')
          }
          this.expanded = (value || []).some(item => item == this.name)
        }
        // 设置组件的展开或收起状态
        this.$nextTick(function() {
          this.setContentAnimate()
        })
      },