performSegueWithIdentifier not working if called from viewDidLoad - swift

Question

I have a simple app with a loading screen. Here I check for some user details in NSUserDefaults and jump to either the login or the sign up screen.
The viewDidLoad() for the loading screen looks like this:
override func viewDidLoad()
{
super.viewDidLoad()
loadingVM = LoadingVM() as LoadingVM
print("LoadingVC")
checkStoredUser()
}
Here is the checkStoredUser()
func checkStoredUser()
{
storedUserStatus = loadingVM.returnStoredUserStatus()
if(storedUserStatus == true)
{
performSegueWithIdentifier("loadingToLoginVC", sender: self)
}
else
{
performSegueWithIdentifier("loadingToSignUpVC", sender: self)
}
}
As you can see, I decide where to go from here based on what the loadingVM.returnStoredUserStatus() returns. I am sure this returns what it's supposed to return but nothing happens.
Here is the prepareForSegue()
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?)
{
print("prepareForSegue")
if(segue.identifier == "loadingToSignUpVC")
{
let signUpViewCotroller = (segue.destinationViewController as! LocalSignUpVC)
}
else if(segue.identifier == "loadingToLoginVC")
{
print("loadingToLoginVC")
let loginViewCotroller = (segue.destinationViewController as! LoginVC)
}
}
I did some digging and found a weird suggestion that seems to be working but It's not very practical not to mention right to do it like this:
func checkStoredUser()
{
storedUserStatus = loadingVM.returnStoredUserStatus()
let delayTime = dispatch_time(DISPATCH_TIME_NOW, Int64(1.0 * Double(NSEC_PER_SEC)))
dispatch_after(delayTime, dispatch_get_main_queue())
{
if(self.storedUserStatus == false)
{
self.performSegueWithIdentifier("loadingToSignUpVC", sender: self)
}
else
{
self.performSegueWithIdentifier("loadingToLoginVC", sender: self)
}
}
}
Can anyone explain to me what's going on here, why doesn't this work and how to make it work properly? It's the first time I encounter this and I can't seem to be able to find any info on this.

Answer 1

EXPLANATION:
Your View hasn't appeared yet when you call your checkStoredUser().
EASY FIX:
Put it in viewDidAppear() like this:
override func viewDidAppear(animated:Bool) {
super.viewDidAppear(false)
checkStoredUser()
}