CODEWITHSUNDEEP
iosswiftuiviewcontrolleruialertcontroller
user3766930
user3766930

Reputation: 5829

Attempt to present <app.TabController> on <app.ViewController> which is already presenting <UIAlertController> in swift

Ok so I'm adding a please wait popup for the operation that takes longer than usual in my ios app.

I have a segue from my ViewController to TabController and when I invoke it like this:

self.performSegueWithIdentifier("openMainApp", sender: self)

everything works fine.

But when I surround it with:

let alert = UIAlertController(title: nil, message: "Please wait...", preferredStyle: .Alert)

alert.view.tintColor = UIColor.blackColor()
let loadingIndicator: UIActivityIndicatorView = UIActivityIndicatorView(frame: CGRectMake(10, 5, 50, 50)) as UIActivityIndicatorView
loadingIndicator.hidesWhenStopped = true
loadingIndicator.activityIndicatorViewStyle = UIActivityIndicatorViewStyle.Gray
loadingIndicator.startAnimating();

alert.view.addSubview(loadingIndicator)
presentViewController(alert, animated: true, completion: nil)

    self.performSegueWithIdentifier("openMainApp", sender: self)

dismissViewControllerAnimated(false, completion: nil)

then I'm getting a warning:

Warning: Attempt to present <app.TabController: 0x7ff6dc00bd40>  
on <app.ViewController: 0x7ff6d9cf6600> which is already presenting 
<UIAlertController: 0x7ff6d9d78530>

how can I skip this warning?

Upvotes: 0

Views: 273

Answers (2)

Idan
Idan

Reputation: 5450

While the source for this warning is still a mystery to me, there is a way to skip the warning.

  1. Delete the segue from storyboard

  2. Give storyboard ID to your view controller, something like:

    enter image description here

  3. Replace self.performSegueWithIdentifier("openMainApp", sender: self) with 

    let viewController: UIViewController =
  self.storyboard!.instantiateViewControllerWithIdentifier("MainScene")
self.presentViewController(viewController, animated: true, completion: nil)

Upvotes: 1

Dan Levy
Dan Levy

Reputation: 4281

Idan's answer may work, but I would recommend using something like MBProgressHud or SVProgressHud. It looks like swift doesn't like it when you perform a segue before dismissing the alert controller because it is it's own view controller. Here is how to implement MBProgressHud. Here is how to implement SVProgressHud. If you don't want to use CocoaPods, you just download the zip file and add the .m and .h file into your project.

Upvotes: 0

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