从alertdialog打开页面时未显示列表

Question

我正在从事离子角项目。我正在使用router.navigate从一页导航到另一页。在下一页中，我将从API提取数组并显示为列表。这正常工作正常。但是，当我从Ionic Alertdialog导航时，此列表未显示。刷新页面后，将显示列表。在第2页中，this.deals是实际列表。

// Page 2
  
ionViewWillEnter() {
  this.fetchDealList();
}

fetchDealList() {
    this.storage.get('userId').then((val1) => {
      this.storage.get('Bearer').then((val2) => {
        this.getDealList(val1, val2);
      });
    });
  }

  getDealList(myuserid, tokenString) {
    let url = 'deals/bizuser';
    let data = { userId: myuserid };
    this.deals = [];
    this.restService.parseModule(data, url, tokenString)
      .then((response) => {
        console.log("getDealList resp: " + JSON.stringify(response));
        const mainResp = response as any[];
        this.filterList(mainResp);
        

      }, (error) => {
        console.log(error.status);
      });
  }

  filterList(mainResp){
    this.deals = mainResp.filter((data) => {
      return data.dealState == 3 && data.secondId == this.mySelectedBranchId;
    });
  }

// Page 1

async showBranches(pos) {
    const alert = await this.alertController.create({
      header: 'Branch Locations!',
      inputs: this.branchArray,
      buttons: [
        {
          text: "CANCEL",
          handler: data => {
            this.alertController.dismiss();
            console.log("cancel clicked");
          }
        },
        {
          text: "OK",
          handler: data => {
            this.alertController.dismiss().then(() => {
              console.log("branchId: " + data);
              this.router.navigate(['draftdeals', { branchID: data }]);
            });
          }
        }],
      cssClass: 'alertRadioCustomCss'
    });
    await alert.present();
  }