SVProgressHUD无法正确显示

Question

出于某种原因，当我点击我的chooseButton时，SVProgressHUD将不会显示。选择chooseButton后，将显示一个新视图。当我按下并再次按下chooseButton时，它会正确显示SVProgressHUD。我想知道如何解决这个问题，这样当我第一次触摸chooseButton时它会显示SVProgressHUD，而不仅仅是当我按下并第二次加载视图时。

class ChooseLocationVC: UIViewController{

@IBAction func chooseButton(_ sender: Any) {
    SVProgressHUD.show()
    if pageControl.currentPage == 0{
        SVProgressHUD.show()
        Global.Location = "Los Angeles"
        Global.usersListSent = usersLA
        print("LA")
    }
    else if pageControl.currentPage == 1{
        SVProgressHUD.show()
        Global.Location = "San Francisco"
        Global.usersListSent = usersSF
        print("SF")
    }else if pageControl.currentPage == 2{
        SVProgressHUD.show()
        Global.Location = "New York"
        Global.usersListSent = usersNY
        print("NY")
    }else if pageControl.currentPage == 3{
        Global.Location = "Miami"
        Global.usersListSent = usersMiami
        print("Miami")
    }else if pageControl.currentPage == 4{
        SVProgressHUD.show()
        Global.Location = "Las Vegas"
        Global.usersListSent = usersLV
        print("LasVegas")
    }else if pageControl.currentPage == 5{
        Global.Location = "Chicago"
        Global.usersListSent = usersChi
        print("Chicago")
    }
}


class PagesCollectionViewController: UICollectionViewController {


override func viewDidLoad() {
    super.viewDidLoad()
    SVProgressHUD.dismiss()
}

func firebaseCallCompleted(data: AnyObject?, isSuccess: Bool, error: Error?, type: FirebaseCallType) {
    if(type == .ListByLocation) {

        if(isSuccess) {
            self.userArray.removeAll()
            self.images.removeAll()
            self.images.removeAll()

            if(data != nil) {

                let dataDict = data as! NSDictionary
                let keyArray = dataDict.allKeys

                for i in 0 ..< keyArray.count {

                    var dict = NSDictionary()
                    dict = dataDict.object(forKey: keyArray[i]) as! NSDictionary
                    self.userArray.append(Users.init(data: dict))
                }
            }

            self.collectionView?.reloadData()
            SVProgressHUD.dismiss()
        }
        else {
            print(error?.localizedDescription)
            SVProgressHUD.dismiss()
        }
    }

}