performSegueWithIdentifier very slow when segue is modal

Question

I have a simple table view where I handle the select action on the table view. This action follows a segue.

If the segue is a push segue, the next view

Answer 1

I tried fixing this multiple ways including moving it to the main thread above. This worked for me:

In storyboard, select the table view in question, (select it in document outline to make sure you've got the right thing. Then in attributes inspector you will be able to see the attributes for the table view as well as the containing scrollview underneath it (all table views are based on scroll view). There is this stupid little box there called "delays content touches". Uncheck it. There is also one "allows cancellable touches" which I'll imagine you want to make sure is unchecked as well, as I think double touches were messing mine up.

Answer 2

For developers organizing their code through subclassing, I've come to quite simple a solution I'd like to share (Swift 4):

import UIKit

class ABCViewController: UIViewController {

  // ... Other useful methods like overriding deinit and didReceiveMemoryWarning

  // Performs a segue on the main thread to ensure it will 
  // transition once a UI-slot is available
  func performSegueOnMainThread(with identifier: String, sender: Any?) {
    DispatchQueue.main.async {
      self.performSegue(with: identifier, sender: sender)
    }
  }
}

Then, simply call it from your implementation:

myViewController.performSegueOnMainThread(with: "ShowDetailsSegue", sender: self)