"Func preferredInterfaceOrientationForPresentation() -> UIInterfaceOrientation" is not called when the application starts.

I would like to force ViewController to be displayed vertically when the application starts.

 func preferredInterfaceOrientationForPresentation()->UIInterfaceOrientation{
    return.Portrait
}

is not called.

The SingleView application does not call you when you make a sample as follows:

import UIKit

classViewController:UIViewController {

    override func viewDidLoad(){
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from anib.
    }

    override funcdidReceiveMemoryWarning(){
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    override func preferredInterfaceOrientationForPresentation()->UIInterfaceOrientation{
        return.Portrait
    }


    override func shouldAutorotate()->Bool{
        return true
    }

    override func supportedInterfaceOrients()->UIInterfaceOrientationMask{
        return.All
    }

}

How do I get called?

swift

2022-09-30 15:05

2 Answers

If you insert print(__FUNCTION__) into each function, you will find that all functions are called normally.
(Verified in Xcode 7.2/Simulator Environment)

This is a way to force the application to appear on a vertical screen, but if you want to do it from the code, you can do it only with the following code:

class ViewController:UIViewController {
    override func viewDidLoad(){
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from anib.
    }

    override funcdidReceiveMemoryWarning(){
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    override func supportedInterfaceOrients()->UIInterfaceOrientationMask{
        return.Portrait
    }
}

More simply, you can specify Device Orientation from Targets - Deployment Info.

2022-09-30 15:05

class AppDelegate:UIResponder, UIApplicationDelegate{

        //...

            func application(application:UIApplication,
                    supportedInterfaceOrientsForWindow:UIWindow?) ->UIInterfaceOrientationMask{
                        if allowLandscape==false{
                            return.Portrait
                        } else{
                            return.All
                        }
            }
}

We were able to change the allowsLandscape flag from viewController at a specific time.

2022-09-30 15:05

If you have any answers or tips

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