CODEWITHSUNDEEP
objective-ciosuiviewcontroller
El Sinior X
El Sinior X

Reputation: 71

"Unrecognized selector sent to instance" error

Part of my AppDelegate code is:

UITabBarController *tabBarController 
    = (UITabBarController *)self.window.rootViewController;

UINavigationController *navigationController 
    = [[tabBarController viewControllers] objectAtIndex:0];

PilotosViewController *playersViewController 
    = [[navigationController viewControllers] objectAtIndex:0];

playersViewController.drivers = players;

But I get this exception:

-[UIViewController viewControllers]: unrecognized selector sent to instance 0x6a75770
*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[UIViewController viewControllers]: unrecognized selector sent to instance 0x6a75770'

Where is the mistake?

Upvotes: 4

Views: 13819

Answers (3)

comic
comic

Reputation: 111

I met the same issue, because I followed the steps by the author, but 

UINavigationController *navigationController 
    = [[tabBarController viewControllers] objectAtIndex:0];

this is what which made the crash, because navigationController is not at index=0, I did exchange the locations of the two tab bar items, then it works.

Upvotes: 11

Viktor Kucera
Viktor Kucera

Reputation: 6335

You are obviously receiving different type of object on index = 0.

If you are using storyboard go there and open Navigator > find specific controller > see Relationships. This order can be used when referencing its viewControllers collection.

Upvotes: 0

wbyoung
wbyoung

Reputation: 22493

You need to make sure that you connect things properly in your XIB or storyboard. The exception is showing you that the object is of type ViewController when you send [tabBarController viewControllers] and you were expecting a UITabBarController. That's why you're getting '-[ViewController viewControllers]:. Make sure that your root view controller really is a tab view controller.

Upvotes: 1

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