My activity indicator is not appearing - swift

Question

I want to show an activity indicator after the user enters login credentials and clicks the login button. This seemed straight forward but the indicator is not showing when I run (build succeeded). I am not sure if this is because when the app runs for real, it will be passing the credentials up to a server for verification but that code is not active yet, so the login is instantaneous, or if I have written this wrong but not to cause an error. Thank you for your help.
#IBAction func loginButtonTapped(sender: AnyObject) {
//add error checking for loginEntered and passwordEntered if they are blank
if loginEntered.text == "" || passwordEntered.text == "" {
//Define the variable error for the message that should be displayed
self.alertError = "Please enter your Login ID and/or Password"
}
if self.alertError != "" { //if there is an error with the login
//Display the error message on screen
self.displayAlert("Missing Required Information", error: alertError)
//reset error variable
self.alertError = ""
//return the user to the LoginID field and empty it if there is data in it. Empty the password field too. ?? How do I do that??
} else { //the login ID and password are entered
//setup for a spinner to notify the user the app is working on something
activityIndicator = UIActivityIndicatorView(frame: CGRectMake(0, 0, 80, 80))
activityIndicator.center = self.view.center;
activityIndicator.backgroundColor = (UIColor(white: 0.3, alpha: 0.5)) //creates a background behind the spinner
activityIndicator.layer.cornerRadius = 10
activityIndicator.hidesWhenStopped = true
activityIndicator.activityIndicatorViewStyle = UIActivityIndicatorViewStyle.WhiteLarge
view.addSubview(activityIndicator)
activityIndicator.startAnimating()
UIApplication.sharedApplication().beginIgnoringInteractionEvents()
The code goes on to several if statements based on the login credentials and returning data from the server. Finally, is stops ignoring interaction events. Finally, I put this same code into an IBAction for a button I created to test the code. It works for the button.

Answer 1

Your code is fine or rather I would say it works, as mention is because the process takes milliseconds and not persives, I recommend that you put breakpoints in your code so that when you press Build can view the interaction to steps in your code.