got error "variable used within it's own initial value"

Question

when i am trying to run this code i got error "variable used within it's own initial value" . what cause this error ?

var pagetitle = ""
var alertActionButtons = [UIAlertAction]()
var okAction = UIAlertAction(title: pagetitle, style: .Default) { action in
    self.presentingViewController!.dismissViewControllerAnimated(false) {
        self.unitDetailProtocolVar!.closeUnitDetail()
    }
}
alertActionButtons.append(okAction)
self.alert = self.controllerUtil.customAlert(pagetitle, buttons: alertActionButtons, alertMessage: alertMessage)

I see you edited the question to include the missing curly brace. Is it still giving you the same error? If so, check for a recursive method call. Is this code written within dismissViewControllerAnimated or closeUnitDetail? — bgolson
– bgolson, Commented Jun 30, 2015 at 14:39

Antonio · Accepted Answer · 2015-06-30 13:12:12Z

The error itself means that you are trying to use a variable to initialize itself.

In your case it's just a missing bracket, causing code to be misaligned. This is how your code looks like:

var okAction = UIAlertAction(title: pagetitle, style: .Default){ action in
    self.presentingViewController!.dismissViewControllerAnimated(false, completion: { ()->Void in
        self.unitDetailProtocolVar!.closeUnitDetail()
    })

    alertActionButtons.append(okAction)
    self.alert = self.controllerUtil.customAlert(pagetitle, buttons: alertActionButtons, alertMessage: alertMessage)
}

and you can see that okAction is used in this line:

alertActionButtons.append(okAction)

The missing bracket in your code is in the closure passed to the UIAlertAction:

var okAction = UIAlertAction(title: pagetitle, style: .Default){ action in
    self.presentingViewController!.dismissViewControllerAnimated(false, completion: { ()->Void in
        self.unitDetailProtocolVar!.closeUnitDetail()
    })
} // <-- this is missing

alertActionButtons.append(okAction)
self.alert = self.controllerUtil.customAlert(pagetitle, buttons: alertActionButtons, alertMessage: alertMessage)

bgolson · Accepted Answer · 2015-06-30 13:09:53Z

1

You forgot to close the curly brace before calling alertActionButtons.append(okAction). Therefore, it thinks you're trying to use okAction within it's own assignment block.

Corrected Code:

var pagetitle = ""
var alertActionButtons:[UIAlertAction] = [UIAlertAction]()
var okAction = UIAlertAction(title: pagetitle, style: .Default){action in
    self.presentingViewController!.dismissViewControllerAnimated(false, completion: {()->Void in
        self.unitDetailProtocolVar!.closeUnitDetail()
    });
} // <- Added missing curly brace     
alertActionButtons.append(okAction)
self.alert = self.controllerUtil.customAlert(pagetitle, buttons: alertActionButtons, alertMessage: alertMessage)

answered Jun 30, 2015 at 13:09

bgolson

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