Clever Geek Handbook

Error "Unrecognized selector sent to instance"

Part of my AppDelegate code:

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

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

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

playersViewController.drivers = players;

But I am getting this exception:

- [UIViewController viewControllers] : unrecognized selector posted to instance 0x6a75770
***

Application terminated due to uncaught 'NSInvalidArgumentException', reason: '- [UIViewController viewControllers]: unrecognized selector posted to instance 0x6a75770'

Where is the mistake?

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3 answers


I met the same problem because I followed the steps of the author, but

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


this is what caused the crash because it is navigationController

not in index=0

, I swapped the locations of two tab bar items, then it works.

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You need to make sure you are connecting things correctly in your XIB or storyboard. The exception indicates that the object is of type ViewController

when dispatched [tabBarController viewControllers]

and you expected UITabBarController

. This is why you get '-[ViewController viewControllers]:

. Make sure your root view controller is indeed a tab view controller.



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You are obviously getting an object of a different type at index = 0.

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

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