Custom UIView starts off covering only a portion of the screen - ios

Question

I have a strange problem. I have a custom UIView that is supposed to fill the screen. Here is a picture of the GUI along with the constraints:
Now the main problem is, on the iPad Pro 12.9" simulator, at first the custom view only fills a portion of the screen- like it was following the Air 2 size constraints. However, if I go away from the screen and come back to it such that the screen isn't recreated but just redisplayed, the gui looks almost perfect. On the other hand, the gui looks almost perfect on the iPad Mini device that I have, without having to go and come back. It isn't quite there because the image in the middle section gets clipped slightly at the top and bottom, but I haven't tried hard to figure out why that is happening. I have spent a fair amount of time trying to debug the problem I am asking about. If you need more information to help me solve this problem, I'm happy to provide it- just specify what you need. On the view controllers that actually hold this custom view, I use autoresizing masks to have it fill the screen, which apparently isn't working, but constraints have been tried and they didn't help either.
Any ideas on how to fix this?
UPDATE: I changed the constraints to something I liked better, as I had used "Reset to Suggested Constraints" and that created some weird constraints. Problem still exists, however.
Here is some of the code involving the view:
class SessionDisplayViewController: SessionViewDisplayViewControllerBase
{
//some code omitted for succinctness
#IBOutlet weak var mySessionView: SessionDisplayView!
override func getSessionView() -> SessionDisplayView
{
return mySessionView
}
...
}
class SessionViewDisplayViewControllerBase: UIViewController, SessionDisplayViewDelegate{
...
override func viewDidLoad() {
super.viewDidLoad()
...
if !ShareData.sharedInstance.sessionDataObjectContainer.keys.contains(curSessName) || ShareData.sharedInstance.sessionDataObjectContainer[curSessName] == nil
{
setupMySession(isLive: false, isFinalized: false)
}
else if (ShareData.sharedInstance.sessionDataObjectContainer[curSessName]?.isFinalized)!
{
setupMySession(isLive: false, isFinalized: true)
}
else
{
setupMySession(isLive: true, isFinalized: false)
var fromTempChoose = ShareData.sharedInstance.startingSessionFromTempChoose && !(ShareData.sharedInstance.globalsVar?.hasStartedSession)!
if fromTempChoose || (ShareData.sharedInstance.resumingSessionFromSessDet && !(ShareData.sharedInstance.globalsVar?.hasResumedSession)!)
{
let mySessionView = getSessionView()
mySessionView.curScene.pauseSession(isStartingNow: true)
blurEffect = UIBlurEffect(style: UIBlurEffectStyle.light)
//}
blurEffectView = UIVisualEffectView(effect: blurEffect)
//always fill the view
blurEffectView?.frame = self.view.bounds
blurEffectView?.autoresizingMask = [.flexibleWidth, .flexibleHeight]
self.view.addSubview(blurEffectView!)
}
...
}
var mySessObj = getSessionView() //these three lines of code were added to try to fix the problem. They weren't in the original code
mySessObj.frame = self.view.bounds
setNeedsDisplay()
}
...
func setupMySession(isLive: Bool, isFinalized: Bool)
{
let mySessionView = getSessionView()
//mySessionView.translatesAutoresizingMaskIntoConstraints = false
mySessionView.delegate = self
sessionNameIndex = self.getSessionNumber() - 1
let myName = ShareData.sharedInstance.currentAccount.name
var curSessName = generateCurrentAccountName(name: myName!, value: self.getSessionNumber())
//var names = generateAllPossibleSessionNames(name: myName!)
let curSession = ShareData.sharedInstance.sessionDataObjectContainer[curSessName]
mySessionView.onView(index: getSessionNumber(), sessionName: curSessName, isLive: isLive, isFinalized: isFinalized)
if isLive
{
let val = curSession?.currentValue()
mySessionView.curScene.setStartPosition(newValue: val!)
}
}

Answer 1

It took me awhile to figure this one out. The software was adding an auto resizing mask constraint to the view, which was causing it to look funny. In order to fix this problem, in the initialization of the custom UIView, I had to add the following lines of code:
self.view.autoresizingMask = [.flexibleHeight, .flexibleWidth]
self.view.frame = self.bounds
I guess the software treats the class that is the custom UIView and the view inside it that holds everything as two separate views. I wish the tutorials I found online about creating a custom UIView had included that we need to set the auto resizing mask and the view's frame, but oh well. Lesson learned.