Error when adding object to NSMutableArray in Swift

Question

I'm trying to build a function in my app through which users can add custom specifications to their products. the specifications should be added in an NSMutableArray, but when I want to add an object to it, I get an EXC_BAD_ACCESS error. here's my code:

var specs = NSMutableArray()

func addSpec () {
            var alert = UIAlertController(title: "Nieuwe Specificatie", message: "Vul hier een naam voor de nieuwe specificatie in:", preferredStyle: UIAlertControllerStyle.Alert)
            alert.addTextFieldWithConfigurationHandler(configurationTextField)
            alert.addAction(UIAlertAction(title: "Opslaan", style:UIAlertActionStyle.Default, handler: {(UIAlertAction) in
                self.specs.addObject(self.newSpecificationTitle.text)
                }))
            alert.addAction(UIAlertAction(title: "Annuleren", style:UIAlertActionStyle.Default, handler: {(UIAlertAction) in
                println("annuleren")
                }))
            self.presentViewController(alert, animated: true, completion:nil)
        }

Can anybody see what I'm doing wrong?

is your var specs property or local variable?

Kreiri
– Kreiri

2014-06-19 10:51:48 +00:00
Commented Jun 19, 2014 at 10:51 — Kreiri
– Kreiri, Commented Jun 19, 2014 at 10:51
is self.newSpecificationTitle not nil?

Kreiri
– Kreiri

2014-06-19 10:53:00 +00:00
Commented Jun 19, 2014 at 10:53 — Kreiri
– Kreiri, Commented Jun 19, 2014 at 10:53
Don't use an NSMutableArray(), use an Array

Jack
– Jack

2014-06-19 12:04:05 +00:00
Commented Jun 19, 2014 at 12:04 — Jack
– Jack, Commented Jun 19, 2014 at 12:04

David Arve · Accepted Answer · 2014-06-19 11:25:44Z

1

I'm not sure what you're doing in or where you get your configurationTextField block. But the following code works for me in Xcode 6 DP2

class ViewController: UIViewController {

    var newSpecificationTitleTextField: UITextField?
    var specs = NSMutableArray()

    @IBAction func addSpec(sender: AnyObject) {
        var alert = UIAlertController(title: "Title", message: "Message", preferredStyle: .Alert)
        alert.addTextFieldWithConfigurationHandler { textField in
            self.newSpecificationTitleTextField = textField
        }
        alert.addAction(UIAlertAction(title: "OK", style:.Default, handler: {(UIAlertAction) in
            self.specs.addObject(self.newSpecificationTitleTextField!.text)
            println("\(self.specs)")
            }))
        alert.addAction(UIAlertAction(title: "Cancel", style:.Cancel, handler: {(UIAlertAction) in
            println("Cancel")
            }))
        self.presentViewController(alert, animated: true, completion:nil)

    }
}

answered Jun 19, 2014 at 11:25

David Arve

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5 Comments

Joris416 Over a year ago

Thanks! The only problem I have left is that I apparently can not access the newSpecificationTextField!.text, because it returns nil. do you maybe know how to access the textfield in another way to solve this?

David Arve Over a year ago

Did you set the newSpecificationTitleTextField to the returned textField in the addTextFieldWithConfigurationHandler callback block?

Grimxn Over a year ago

you need to something like "if let newText = newSpecificationTextField?.text { self.specs.addObject(newText) }" ... this is what Swift is all about - what would it mean to add a nil to an NSMutableArray?

Joris416 Over a year ago

@DavidArve I have added the code you posted in my app. the initial error is gone, but now it sais that the object I'm trying to add is nil. What should I add to your code to get this error away?

Joris416 Over a year ago

Got it! the error was the way in which the textfield.text is passed to the array. it should be: self.specs.addObject(NSString(string: self.newSpecificationTitle.text))

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