adding button to the navigation bar

i have a problem while adding button to the navigation bar.. My application consist of two view controllers added to the viewControllers array of a tabBarController. Inturn this tabBarController is added to the viewControllers array of a navigationController. In one of the views i have a textfield for entering dates . On the tap of this textfield the datepicker will pop up. simultaneously i want to display a done button on the navigation bar. how can i do this... i tried using

self.tabBarController.navigationController.navigationItem.rightBarButtonItem = self.doneButton;

But this is no开发者_开发百科t working...

Pls help me out..

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Try this code,

UIBarButtonItem *addButton = [[[UIBarButtonItem alloc] initWithTitle:NSLocalizedString(@"Done", @"")
                                                               style:UIBarButtonItemStyleBordered
                                                              target:self
                                                              action:@selector(DoneButton)] autorelease];

self.navigationItem.rightBarButtonItem = addButton;

Best of luck.

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Try with this

UIBarButtonItem* _doneButton;
self.navigationItem.rightBarButtonItem = _doneButton;

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use this one:

UIButton *myBtn = [[UIButton alloc]init];
[self.navigationItem.titleView addSubview:myBtn];