InstantiateViewControllerWithIdentifier不会在闭包内部维护实例

Question

I am loading the following code in the main controller. I have debugged to assure it is calling the WebPortalViewController with no issues.

Parent Controller A.viewDidLoad()

    let sponsorViewController:UIViewController = storyboard!.instantiateViewControllerWithIdentifier("Child")   
    childViewController.view.setNeedsLayout()
    childViewController.view.layoutIfNeeded()

The Issue is however that the viewDidLoad function relies on execution of an operation call

Child Controller B.viewDidload()

    let operation = GetActiveSubscriptionOperation()

    operation.getActiveSubscriptionCompletionBlock = { [weak self] (subscription, error) in

      switch (self, subscription, error) {

self is always null until the view Controller is loaded directly from the UITabController. How do I get the getActiveSubscriptionCompletionBlock to maintain self in the closure?

Answer 1

weak is declared as an Optional, variable could be nil if not reachable. So it is normal getting nil until viewcontroller loaded.

For me viewDidLoad should not rely on a execution of function it is in lifecycle of viewcontroller.