保存和检索数字时出现问题

Question

我正在开发一个使用CoreData的应用。

我是强大的数字并检索它们，但是当我存储多个字段时，它只显示带有数字的最后一个字段，但是显示所有其他字段中的0。以下是我的代码。

存储它们......

 let CWConvert = Double(CWeight.text!)
                            storeTranscription18CW(pageText: (CWConvert)!, textFileUrlString: "cWeight")
                                savePlus += 1


                            let TWConvert = Double(TWeight.text!)
                            storeTranscription18TW(pageText: (TWConvert)!, textFileUrlString: "tWeight")

和...

        func getContext () -> NSManagedObjectContext {
    _ = UIApplication.shared.delegate as! AppDelegate
    return DataController().managedObjectContext
}


func storeTranscription18CW (pageText: Double, textFileUrlString: String) {


    let context = getContext()

    //retrieve the entity that we just created
    let entity =  NSEntityDescription.entity(forEntityName: "TextInputs", in: context)

    let transc = NSManagedObject(entity: entity!, insertInto: context)

    // set the entity values

        transc.setValue(pageText, forKey: "cWeight")

    //save the object
    do {
        try context.save()
        print("saved!")
    } catch let error as NSError  {
        print("Could not save \(error), \(error.userInfo)")
    } catch {

    }
}


func storeTranscription18TW (pageText: Double, textFileUrlString: String) {
    let contexta = getContext()

    //retrieve the entity that we just created
    let entitya =  NSEntityDescription.entity(forEntityName: "TextInputs", in: contexta)

    let transc = NSManagedObject(entity: entitya!, insertInto: contexta)

    // set the entity values

        transc.setValue(pageText, forKey: "tWeight")

    //save the object
    do {
        try contexta.save()
        print("saved!")
    } catch let error as NSError  {
        print("Could not save \(error), \(error.userInfo)")
    } catch {

    }
}

并且要追溯。

    func getTranscriptions18CW () {
    //create a fetch request, telling it about the entity
    let fetchRequesta: NSFetchRequest<TextInputs> = TextInputs.fetchRequest()
    do {
        //go get the results
        let searchResults18CW = try getContext().fetch(fetchRequesta)

            for transa in searchResults18CW as [NSManagedObject] {
                if let resulta = transa.value(forKey: "cWeight") {
                    if let stra = resulta as? String {
                        CWeight.text = stra
                    }else {
                        CWeight?.text = "\(resulta)"
                    }
                }
            }
            //get the Key Value pairs (although there may be a better
    }catch {
        print("Error with request: \(error)")
    }
}

func getTranscriptions18TW () {
    //create a fetch request, telling it about the entity
    let fetchRequest: NSFetchRequest<TextInputs> = TextInputs.fetchRequest()
    do {
        //go get the results
        let searchResults18TW = try getContext().fetch(fetchRequest)

            for trans in searchResults18TW as [NSManagedObject] {
                if let result = trans.value(forKey: "tWeight") {
                    if let str = result as? String {
                        TWeight.text = str
                    }else {
                        TWeight?.text = "\(result)"

                }
            }
            //get the Key Value pairs (although there may be a better way to do that...
        }
    }catch {
        print("Error with request: \(error)")
    }
}

我尝试了不同的名字，但得到的相同它只显示最后一个作为实数，如果我突破最后一个然后第一个显示实际值。

Answer 1

尝试更多类似的内容进行保存，以便将两者保存在同一行中。

func storeTranscription18TW () {
    let contexta = getContext()

    //retrieve the entity that we just created
    let entitya =  NSEntityDescription.entity(forEntityName: "TextInputs", in: contexta)

    let transc = NSManagedObject(entity: entitya!, insertInto: contexta)

    // set the entity values
    transc.setValue(CWConvert, forKey: "cWeight") // Note the change from pageText
    transc.setValue(TWConvert, forKey: "tWeight") // Note the change from pageText

    //save the object
    do {
       try contexta.save()
       print("saved!")
       } catch let error as NSError  {
          print("Could not save \(error), \(error.userInfo)")
       } catch {

   }
}

然后，当你做一个get，他们都将在同一个函数中完成。