ViewController未从内存释放

Question

I have this view hierarchy

• RouterDashboardViewController : RootViewController

• RootViewController : UIViewController

Currently, RouterDashboardViewController instance is in the navigation stack. When I reset rootViewController of NavigationController then RouerDashboardInstance still exist in memory because I can check my deinit{} method not gets called.Below are the stack traces in Instruments but am not able to detect any reason why my RouterDashboard instance not get deallocated. I am sure there will be retain cycles which keeps RouterDashboard instance still alive. One more thing am not understanding these stack traces because ViewDidLoad() method called several times.

Answer 1

Something has a strong reference to RouterDashboardViewController . A few things to check…

• Are you assigning it to a variable?

  • You may need to declare it as weak var …

• Is it a delegate of another class?

  • Make sure delegate properties are also weak var s

• Does it use any closures that refer it self ?

  • Add a capture list to your closure's parameter list ( [unowned self] or [weak self] )