presentViewController shows not all elements on presented view controller - ios

Question

I encountered a problem while trying to present a new view controller within a storyboard using following code:
let viewController = self.storyboard?.instantiateViewControllerWithIdentifier("ViewControllerIdentifier")
self.presentViewController(viewController!, animated: true, completion: nil)
The view controller does appear, but shows for some reason only two buttons, no other elements.
What have I tried so far:
Loading the view controller as initial view controller to see if the
problem remains.
No, all elements are at the right position.
Switching animated from true to false. Problem still remains
Printing the hidden attribute as well as x and y positions. Hidden
is false, and the positions are what they are supposed to be
Cleaning and rebuilding the project, since this seems to fix 99% of
all strange bugs based on my experience. Sadly this helped not this
time
Setting hidden first on true, then on false. Resetting the attribute
does not help.
Using CFRunLoopWakeUp(CFRunLoopGetCurrent()) . Does not help
either.
I have a simple drawing of what my view looks like attached.
As stated, the view controller is shown perfectly fine when I load it as initial view controller, but only the buttons are shown when using the code above.
ViewDidAppear is called as well.
I am using Xcode Version 7.2.1
EDIT:
As requested by comment, this is my code for the view controller to be presented:
import UIKit
class myViewController : UIViewController {
#IBOutlet weak var myImage: UIImageView!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
}
override func viewDidAppear(animated: Bool) {
super.viewDidAppear(animated)
}
override func supportedInterfaceOrientations() -> UIInterfaceOrientationMask {
return UIInterfaceOrientationMask.Portrait
}
}
Edit:
I found a solution to this problem:
By creating the transition within the following block.
dispatch_async(dispatch_get_main_queue(),^{
});
It appears that my problem was, that the lines that trigger said transition weren't executed on the UI thread. I still have no idea why this lead to the behaviour explained above, but at least there is a solution.

Answer 1

In my experience problems like this can be down to your auto layout constraints being messed up or not quite as you need them (although the fact that it presents correctly when it is the default might suggest I am not headed down the right path).
Are there any warnings in the storyboard editor that suggest the constraints are not correct? I would also suggesting using the view debugging feature to help troubleshoot. Click on the circled icon when your app is running to show your view hierarchy and then try to find the views you think should be there. It also allows you to look at constraints, so that might help with point 1 above as well.