CODEWITHSUNDEEP
functionswiftios8uialertviewuialertcontroller
the_pantless_coder
the_pantless_coder

Reputation: 2297

SWIFT - helper class callback

In order to manage/shorten my code a little, I decided to try to create a helper class to manage all alerts.

The idea is that the helper class will create the alert. When the user presses the button, it will then send a callback to inform the code on the viewController which button is pressed. Then based on that I can fire different bits of code.

Currently the code I have manages to pop up the alert correctly, but I cannot get it to send the callback when the button is pressed.

here is my alert manager I created so far(still basic for simplicity):

var alertMgr: alertManager = alertManager()
class alertManager: NSObject {

func showAlert(titleText:String?, confirmText:String, cancelText:String, msgText:String, showCancel:Bool, showConfirm:Bool, style:UIAlertControllerStyle, viewController:UIViewController) -> Int? {


    let alertController = UIAlertController(title: titleText, message: msgText, preferredStyle: style)
    var myInt:Int!

    let actionLeft = UIAlertAction(title:cancelText, style: .Cancel) { action in

        println("0") //works when user presses cancel button
        myInt = 0
    }

    let actionRight = UIAlertAction(title:confirmText, style: .Default) { action in

        println("1") //works when user presses confirm button
        myInt = 1
    }

    alertController.addAction(actionLeft)
    alertController.addAction(actionRight)

    viewController.presentViewController(alertController, animated: true, completion: nil)

    return myInt //does not return when button is pressed???
}  
}

In my code when I want to show an alert I use the following code:

        let titleTxt:String = "title txt goes here."
        let confirmTxt:String = "confirm"
        let cancelTxt:String = "cancel"
        let msgTxt:String = "some msg goes here."
        let showCancel:Bool = true
        let showConfirm:Bool = true
        let style:UIAlertControllerStyle = .ActionSheet

        let alert = alertMgr.showAlert(titleTxt, confirmText: confirmTxt, cancelText: cancelTxt, msgText: msgTxt, showCancel: showCancel, showConfirm: showConfirm, style:style, viewController: self)

        switch alert as Int! {
            case nil:
                println("nil value")
            case 0:
                println("cancel pressed")  //never gets fired. when button is pressed
            case 1:
                println("confirm pressed") //never gets fired. when button is pressed
            default:
                break
        }

The main problem is I cannot seem to get the call back to send the "myInt" value on button press. I have searched through pretty much all questions on here with [UIAlertController] and have not been able to find any hints that would push me in the right direction.

Any help would be great.

Upvotes: 2

Views: 918

Answers (1)

A-Live
A-Live

Reputation: 8944

showAlert returns the value of myInt before any of the given blocks gets a chance to be executed, the solution is to pass complete action-blocks as parameters of showAlert. In order to shorten the signature you can prepare a special type with text, block and flag values and make the function to process arrays of the objects of this type.

Upvotes: 2

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