UIAlertView not returning appropriate value - ios

Question

Here is my code
import Foundation
import UIKit
class Alert: UIViewController {
class func showAlert(title: String, message: String, buttonTitle: String? = nil, buttonTitle2: String? = nil, sender: UIViewController) -> Int? {
var flag : Int?
func yes(){
flag = 1
}
func no(){
flag = 0
}
//= nil ;
if objc_getClass("UIAlertController") != nil {
let alert = UIAlertController(title: title, message: message, preferredStyle: UIAlertControllerStyle.Alert)
if (buttonTitle != nil){
alert.addAction(UIAlertAction(title: buttonTitle, style: UIAlertActionStyle.Default, handler: { (action: UIAlertAction!) in
yes()
}))
}
if (buttonTitle2 != nil) {
alert.addAction(UIAlertAction(title: buttonTitle2, style: UIAlertActionStyle.Default, handler: { (action: UIAlertAction!) in
no()
}))
}
sender.presentViewController(alert, animated: true, completion: nil)
return flag
} else {
let alert = UIAlertView()
alert.title = title
alert.message = message
alert.addButtonWithTitle(buttonTitle)
alert.addButtonWithTitle(buttonTitle2)
print("inside Else")
alert.show()
return flag
//make and use a UIAlertView
}
}
}
The problem is that the flag getting returned is always nil to the view controller I call Alert from. I need the flag to return 1 if "yes" is pressed and 0 if "No" is pressed. I have been stuck in this problem for lot of time. Help.

Answer 1

Try this code,
import UIKit
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
#IBAction func showAlert() {
let alertController = UIAlertController(title: "Hey there", message: "Do you want to do it?", preferredStyle: .Alert)
let btnAction1 = UIAlertAction(title: "Yes", style: .Default) { (action : UIAlertAction) -> Void in
self.yes()
}
let btnAction2 = UIAlertAction(title: "No", style: .Default) { (action : UIAlertAction) -> Void in
self.no()
}
alertController.addAction(btnAction1)
alertController.addAction(btnAction2)
presentViewController(alertController, animated: true, completion: nil)
}
func yes() -> Int
{
print("Yes")
return 1
}
func no() -> Int
{
print("No")
return 0
}
}
Its working fine here, i hope it will work for u also.. :)

Answer 2

You made a mistake that closure won't execute until button clicked but function will return right now.You should deliver a closure to this function.It will look like:
class func showAlert(title: String, message: String, buttonTitle: String? = nil, buttonTitle2: String? = nil, sender: UIViewController,handler: ((Bool) -> Void)) -> Void
And handle it in alert action like this:
handler(true)