AlertController不会在保存时保存textField文本，只能编辑

Question

I have an alertController with a textField. The user enters their data into the textField and hits "set". It should then create the item and save the text entered as my attribute it's set to. However, upon creating the item the textField passes nil. It's not saved until the item is reopened and saved again (prompting the alertController to request data in the textField). Why is it not saving it the first time?

saveButton pressed:

@IBAction func saveButton(sender: AnyObject) {
    if (item?.slminqty == nil) {
    let alert = UIAlertController(title: "Minimun Qty.", message: "Please set minimun qty. for pantry.", preferredStyle: UIAlertControllerStyle.Alert)

        alert.addTextFieldWithConfigurationHandler { (textField: UITextField!) -> Void in
        textField.placeholder = "Minimun Qty."
        textField.keyboardType = .NumbersAndPunctuation
        textField.clearButtonMode = UITextFieldViewMode.WhileEditing
    }

    alert.addAction(UIAlertAction(title: "Dismiss", style: UIAlertActionStyle.Default, handler: {saveitem}()))
    alert.addAction(UIAlertAction(title: "Set", style: UIAlertActionStyle.Default, handler: {(action) -> Void in
        let textField = alert.textFields![0].text!
        self.item?.slminqty = textField

       self.saveitem(self)}))

        self.presentViewController(alert, animated: true, completion: nil)

    }else{

        if item != nil {
            edititems()

        } else {
            createitems()
        }
        print(item?.slminqty)

        dismissVC()
    }

    }

Save function:

func saveitem(sender: AnyObject) {

    if item != nil {
        edititems()

    } else {
        createitems()
    }
    print(item?.slminqty)

    dismissVC()
}

Create function:

func createitems() {

    let entityDescription = NSEntityDescription.entityForName("List", inManagedObjectContext: moc)

    let item = List(entity: entityDescription!, insertIntoManagedObjectContext: moc)

    item.slitem = slitem.text
    item.sldesc = sldesc.text
    item.slqty = slqty.text
    item.slprice = slprice.text
    item.slist = true
    item.slcross = false

    if slitem.text == nil{
        createitems()

    }else{
        edititems()
    }

    do {
        try moc.save()
    } catch _ {
        return
    }
}

Edit function:

func edititems() {
    item?.slitem = slitem.text!
    item?.sldesc = sldesc.text!
    item?.slqty = slqty.text!
    item?.slprice = slprice.text!

    do {
        try moc.save()
    } catch {
        return
    }
}

If both of the create and edit are the same (with the exception of slcross and slist) why won't it save the data when the item is created?

Answer 1

Edit please see my pull reqest , I have made some changes to your code. along with some comments.

I think the problem in this line :

 self.item?.slminqty = textField

self.item might be nil. you should make sure first item is not nil.

you may try to create item if this is nil. like:

if self.item == nil {
   //create item. 
   self.acreateItems()
   // after creating the item just test its value.
    print("item was nil so we just created it.\nIts value not is \(self.item)")
}
self.item?.slminqty = textField