[swift-users] UINavigationController subclass leaks member variable memory

[吴君恺]

Hello community, 

	I just encountered a pretty weird behavior when I subclass  `UINavigationController` without overriding any initializers.

Simple Code:

import UIKit

class MyViewController: UINavigationController {
  
  let value: Int = {
    print("member init")
    return 3
  }()
}

let _ = MyViewController(rootViewController: UIViewController())

output is:

member init
member init

In fact any member variables declared in this subclass is initialized twice but deinitialized only once.
This phenomenon only appears when using `init(rootViewController:)`. 

CMIW, It looks like Swift somehow treat this initializer as a designated initializer, rather than a convenience one. 

Any Ideas?






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