Partly retrieve data. iOS platform

Hi all ! I Could anyone suggest please … on iOs platform i have some kind of bug with content display … when page is fully downloading i see only partly content … but when I click on item on this page, go to the next page and return … I could see fully content. On adroid platform I do not have such bugs … I don’t understand what happened … Ionic does not have time to display the entire contents of the object …

  ionViewDidEnter() {
    this.CreateExistingTree();
 }
  public CreateExistingTree():Promise<any> {
    return new Promise((resolve, reject) => {
      this.loading = this.loader.create({
        content: 'Loading information...'
      });
      this.loading.present();

      this.contentProvider.get_items(null, this.model_id).then(data => {
        this.modelsService.getModalAddDate(this.model_id).then(result => {
          if (data.length > 0) {
            if (result.res.rows.length > 0) {
              let datas = [];
              for (let i = 0; i < data.length; i++) {
                this.appProvider.tapEventPageForResourses(data[i]).then(sn_result => {
                  let obj = {date: result.res.rows.item(0).date, highlight: false,sn:sn_result};
                  datas.push(Object.assign(data[i], obj));
                });
              }
              this.content = datas;
            } else {
              data.highlight = false;
              this.content = data;
            }
            this.content_temp = this.content;
            this.checkingZip().then(() => {
              this.loading.dismiss();
              resolve(true);
            })
          } else {
            this.contentLength = data.length;
            this.checkingZip().then(() => {
              this.loading.dismiss();
              resolve(true);
            })
          }
        }).catch(err => {
          console.warn(err);
          this.logProvider.writeLog("ERROR in getting getModalAddDate from local db while CreateExistingTree", err);
          this.loading.dismiss();
        });
      }).catch(err => {
        this.checkingZip().then(() => {
          this.loading.dismiss();
          resolve(true);
        });
      });
    });
  }

Good day ! Any idea for this issue ?