CODEWITHSUNDEEP
iosiphoneswiftunit-testing
Kilom94l
Kilom94l

Reputation: 85

Swift - Dependency injection in unit test

This the first time am working with dependency injection in swift an this is how I do it , I have a dataManager that is initialized in appDelegate then passed to my first view controller witch will then be passed to other view controllers every time they get pushed to screen : 

  if let navigationCtrl = window?.rootViewController as? UINavigationController {

        if let firstViewController = navigationCtrl.topViewController as? FirstViewController {
            firstViewController.dataManager = dataManager
        }
    }

Now doing this, everything works great, but when I go to test each view controller, I always get dataManger to be nil, and I know it's because of the condition I gave in the first place. So is there way to make sure the topViewController always has dataManager variable without inheriting from another ViewController.Thank you

Upvotes: 0

Views: 292

Answers (1)

R.B.
R.B.

Reputation: 423

One of these is happening:

  • window is nil
  • window?.rootViewController is not a UINavigationController
  • navigationCtrl.topViewController is not a FirstViewController
  • firstViewController.dataManager is nil

It should be a simple debug. Either put some breakpoints and/or print statements to know where the problem is.

Tip(s):

  • Make sure to set the view controller's class correctly in XCode/Interface-Builder.

Upvotes: 1

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