CODEWITHSUNDEEP
iphoneobjective-cios
deimus
deimus

Reputation: 9875

tabBar and navigationBar size strange return value

This may sound a newbie question, however I'm new iOS dev.

I'm calling following in viewDidLoad

CGFloat tabBarHeight = self.tabBarController.tabBar.frame.size.height;
CGFloat navigationBarHegith = self.navigationController.navigationBar.bounds.size.height;

The return values are 0 for both, why this is so ? Doesn't it mean that navigationBar and tabBar are already loaded into memory and initialized.

Upvotes: 0

Views: 234

Answers (3)

SentineL
SentineL

Reputation: 4732

it works fine for me. make shure, that your tab bar and nav. bar are allready inited, when you aske there properties. Do it in - (void)viewWillAppear:(BOOL)animated method.

Upvotes: 0

Alan Zeino
Alan Zeino

Reputation: 4396

viewDidLoad doesn't guarantee that user interface objects have been instantiated - they're zero because they probably don't exist. Try viewWillAppear.

Upvotes: 2

Bryan Chen
Bryan Chen

Reputation: 46598

It is more likely that your view controller does not have tab bar controller and navigation controller.

Check the value of self.tabBarController and self.navigationController and if they are nil (zero), unlike java or C++, invoke method on nil will simply just return 0, which is what you got.

Upvotes: 1

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