在iPad3上運行應用程序時，在模擬器上沒有變量，但變量沒有顯示。 斯威夫特4

Question

在我的第一個應用程序中，我有一個函數以[String:String]字典形式發布到Firebase，在Firebase中，我看到發布的所有值都是String 。 在我的第二個應用程序中，我有一個讀取該節點並也以[String:String]檢索的函數，但是在快照中打印了兩個值， Booking Date和Booking Id看起來像Int 。 我不是真正讓他們Int就像我需要他們，當我在模擬器上運行我的第二個應用程序iOS 12.1 it't都好，按預期工作，但是當我在我的iPad 3運行iOS 9.3.5的應用程序崩潰，因為let bookingId = Int(value["Booking Id"]!)為nil，但是如果let bookingDate = Int(value["Booking Date"]!)則不會發生這種情況。 似乎iPad不喜歡轉換多個值。 您看到對此有任何解決方案嗎？ 這是函數：

func getMyBookings() {

    let ref = Database.database().reference()
    ref.child("Continent").child("Europe").child("Country").child("Italy").child("Region").child("Emilia-Romagna").child("City").child("Bologna").child("Shops").child("Workshop Bookings").queryOrdered(byChild: "Shop Name").queryEqual(toValue: "Spezial Cycle").observe(.value)  { (snapshot) in

        //        ref.child("Continent").child("Europe").child("Country").child("Italy").child("Region").child("Emilia-Romagna").child("City").child("Bologna").child("Shops").child("Workshop Bookings").queryOrdered(byChild: "Shop Name").queryEqual(toValue: "Spezial Cycle").observe(.childAdded, with: { (snapshot) in

        print(snapshot)
        if let data = snapshot.value as? [String: [String:String]] {

            for (_, value) in
                data{
                    let bookingDate = Int(value["Booking Date"]!)!
                    //                        let bookingDate = value["Booking Date"]!
                    print("bookingDate is: \(String(describing: bookingDate))")
                    let bookingStart = value["Booking Start"]
                    let bookingEnd = value["Booking End"]
                    let customerName = value["User Name"]
                    let bookingId = Int(value["Booking Id"]!)!
                    print("bookingId is :\(String(describing: bookingId))")
                    let booking: (bookingDate: Int, bookingStart: String, bookingEnd: String, customerName: String, bookingId: Int) = (bookingDate!, bookingStart!, bookingEnd!, customerName!, bookingId: bookingId)
                    print("booking is: \(booking)")
                    self.bookingsArray.append(booking)
                    self.calculateBookedTimeSlots()
            }
            self.calculateBookedTimeSlots()
            if #available(iOS 10.0, *) {
                let actions: [UNNotificationAction] = [UNNotificationAction(identifier: "chiudi", title: "Chiudi", options: [.foreground])]
                Notifications.newTimeIntervalNotification(notificationType: "New booking", actions: actions, categoyIdentifier: "New Booking", title: "Nuova prenotazione", body: "Hai una nuova prenotazione", userInfo: [:], timeInterval: 5, repeats: false)
            } else if #available(iOS 9.0, *){
                // Fallback on earlier versions

                Notifications.newTimeIntervalNotification(notificationType: "New booking", actions: [], categoyIdentifier: "New Booking", title: "Nuova prenotazione", body: "Hai una nuova prenotazione", userInfo: [:], timeInterval: 5, repeats: false)
            }
        }
        //        })
    }
}

這是快照打印，顯示Booking Date和Booking Id像Int一樣：

Snap (Workshop Bookings) {
    "-Lb4XzGtLtnBAgoPB6Ay" =     {
        "Booking Date" = 20190329;
        "Booking End" = "14:00";
        "Booking Id" = 201903291300;
        "Booking Start" = "13:00";
        "Shop Logo Url" = "https://firebasestorage.googleapis.com/v0/b/fix-it-b4b00.appspot.com/o/Spezial%20Cycle%2FSpezial%20Cycle%20logo.png?alt=media&token=016cc976-ae8d-4c71-a77f-a899d661be20";
        "Shop Name" = "Spezial Cycle";
        "User Name" = "";
        "Works List" = "Revisione Generale, ";
    };
} 

Answer 1

我認為問題在於您的iPad 3仍在32位數據總線上運行，並且值201903291300太大而無法放入該Int32 （這是32位體系結構上的Int實現）。

您應該嘗試使用Int64而不是Int