how to lock portrait orientation for only main view using swift

Question

I have created an application for iPhone, using swift, that is composed from many views embedded in a navigation controller. I would like to lock the main v

Answer 1

You do have to apply this to your top view controller. However, you can do it in a clean/easy way by subclassing your top view controller and setting a variable within it that to references every time you make a call to:

shouldAutoRotate()

which is called when the device detects an orientation change and precedes the call to:

supportedInterfaceOrientations()//this is only called if shouldAutoRotate() returns true

For example, say my top view controller is a TabBarController:

class SomeSubclassTabBarViewController: UITabBarController { //This subclass allows us to pass along data to each of the tabBars

var dataArray = StoredValues()//also useful for passing info between tabs
var shouldRotate: Bool = false


override func shouldAutorotate() -> Bool { //allow the subviews accessing the tabBarController to set whether they should rotate or not
    return self.shouldRotate
}

}

Then within the view which should have the ability to rotate the screen, set the viewWillAppear() and viewWillDisappear() like so:

override func viewWillAppear(animated: Bool) { //set the rotate capability to true
    let sharedTabBarController = self.tabBarController as SomeSubclassTabBarViewController
    sharedTabBarController.shouldRotate = true
}

override func viewWillDisappear(animated: Bool) {
    let sharedTabBarController = self.tabBarController as SomeSubclassTabBarViewController
    sharedTabBarController.shouldRotate = false
}

and just in case your app crashes while on this screen, it's probably a good idea to explicitly set the shouldRotate: Bool value on each of your views within the viewWillLoad() method.