Blocking a Loop Using UIAlertController

Question

is there a way for us to block a for loop?

I have a loop where inside it, it ask user with a dialog box. I would like it to pause the loop after user press OK or Cancel.

Is it possible?

Because looping an alertController looks really ugly especialy when you have many loops.

for request in friendRequests
{
    let alertController = UIAlertController(title: "Friend Request", message: "Would you like to accept this friend request?", preferredStyle: UIAlertControllerStyle.Alert);
    let cancelAction: UIAlertAction = UIAlertAction(title: "OK", style: UIAlertActionStyle.Cancel, handler: nil);
    let confirmAction: UIAlertAction = UIAlertAction(title: "OK", style: UIAlertActionStyle.Default, handler: nil);

    alertController.addAction(cancelAction);
    alertController.addAction(confirmAction);

    //How do we block or wait until user press a button??  
    self.navigationController.presentViewController(alertController);
}

Any thoughts? Thanks

Answer 1

Use Recursive Function rather than loop

Example

var name:[String] = ["abcd","efgh","ijkl","mnop","qrst","uvwx"]
self.friendReuqest(name, index: 0)

func friendReuqest(name:[String],index:Int)
{
    if index < name.count
    {
        let alertController = UIAlertController(title: name[index], message: "Would you like to accept this friend request?", preferredStyle: UIAlertControllerStyle.Alert)

        let cancelAction: UIAlertAction = UIAlertAction(title: "Dismiss", style: UIAlertActionStyle.Cancel){ (action: UIAlertAction!) -> Void in
            // do stuff here when press cancel
        }

        let confirmAction: UIAlertAction = UIAlertAction(title: "Add", style: UIAlertActionStyle.Default) { (action: UIAlertAction!) -> Void in
            self.friendReuqest(name, index: (index + 1))
        }

        alertController.addAction(cancelAction)
        alertController.addAction(confirmAction)
        self.presentViewController(alertController, animated: true, completion: nil)
    }
}

Answer 2

Instead of creating loops, implement a logical method that calls itself after user's decision.

Change method implementation like:

func showAlert(var requestIndex : Int)
{
    if (requestIndex < friendRequests.count)
    {
        var request = friendRequests[requestIndex]
        requestIndex++
        let alertController = UIAlertController(title: "Friend Request", message: "Would you like to accept this friend request?", preferredStyle: UIAlertControllerStyle.Alert);
        let cancelAction: UIAlertAction = UIAlertAction(title: "OK", style: UIAlertActionStyle.Cancel, handler:{ action in
            showAlert(requestIndex)
        });
        let confirmAction: UIAlertAction = UIAlertAction(title: "OK", style: UIAlertActionStyle.Default, handler: { action in
            showAlert(requestIndex)
        });

        alertController.addAction(cancelAction);
        alertController.addAction(confirmAction);

        //How do we block or wait until user press a button??
        self.navigationController.presentViewController(alertController);
    }
}

Initially call the method like:

showAlert(0);