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I have 3 devices. One is iPhone 7 plus which system version is iOS 14.8. and the others are iOS 15.1, though one is iPhoneX , one is ipad. When I use xcode to run my app, I find out the memory keeps rasing in iOS 15.1. By using instruments, I could see there're a lot autoreleasepoll content(which is growing more and more). But it doen't happen on iOS 14.8.

HI, I override init(rootViewController: UIViewController) for my navigationcontroller by swift. and under iOS12, it seems trying to call @objc init(nibName:bundle:) which I did not implemented, and then it crash. But for iOS13 and above, It would not call the method init(nibName:bundle:), so no crash. After some users crashed on the new version on appStore,then I known that problem. And I do not have iOS12 machine to test it, and my app could not run on m1 mac since some thirdpart framework doesn't support. If the method is necessary, it would be better to make it a required method like init(corder:)