my.showNavigationBarLoading

my.showNavigationBarLoading();

Page({
  async fetchData() {
    // Show loading indicator
    my.showNavigationBarLoading();

    try {
      const res = await my.request({
        url: 'https://api.example.com/data'
      });
      this.setData({ items: res.data });
    } finally {
      // Hide loading indicator
      my.hideNavigationBarLoading();
    }
  }
});

Page({
  onPullDownRefresh() {
    my.showNavigationBarLoading();

    this.refreshData().then(() => {
      my.hideNavigationBarLoading();
      my.stopPullDownRefresh();
    });
  }
});