Iterate view controllers of navigation controller swift

Question

I want to iterate through view controllers of navigation controller in swift. For that I wrote a for loop like this

for navController in tabBarController?.viewControllers {
     //some process
}

tabBarController is a UITabBarController. But I am getting error like '$T4??' does not have a member named 'Generator' Whats wrong with the code?

Kirsteins · Accepted Answer · 2014-11-16 12:33:47Z

6

Optional chaining results in optional array of view controllers. Optional arrays do not conform to those protocols for be iterated with for..in loop. Try:

if let viewControllers = tabBarController?.viewControllers {
    for viewController in viewControllers {
        // some process
    } 
}

answered Nov 16, 2014 at 12:33

Kirsteins

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3 Comments

linimin Over a year ago

for viewController in tabBarController?.viewControllers as [UIViewController] {} also works.

Johnykutty Over a year ago

@Swipesight it shows error viewController '[UIViewController]?' does not have a member named 'Generator'

Johnykutty Over a year ago

@Swipesight sorry my bad my object was tabController not tabBarController. tabBarController taking view controllers property I think

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