uinavigationbar - Change title of UINavigationBar

Question

I've created a view-based application. I've placed a Navigation Bar on the view and two buttons. I'd like to change the title of the nav bar after pressing the buttons. In IB I've connected the buttons with the corresponding actions. Debugging shows that the actions are getting called but the title of the nav bar is not changed.

Kindly help!

//
//  NavBarViewController.h

#import <UIKit/UIKit.h>

@interface NavBarViewController : UIViewController {

}

-(IBAction) clickedOne: (id)sender;
-(IBAction) clickedTwo: (id)sender;

@end
//
//  NavBarViewController.m

#import "NavBarViewController.h"

@implementation NavBarViewController

-(IBAction) clickedOne: (id)sender {
    self.navigationItem.title = @"1";
}

-(IBAction) clickedTwo: (id)sender {
    self.navigationItem.title = @"2";
}


- (void)didReceiveMemoryWarning {
    // Releases the view if it doesn't have a superview.
    [super didReceiveMemoryWarning];

    // Release any cached data, images, etc that aren't in use.
}

- (void)viewDidUnload {
    // Release any retained subviews of the main view.
    // e.g. self.myOutlet = nil;
}


- (void)dealloc {
    [super dealloc];
}

@end

Answer 1

我已经找到了。我使用了 UINavigationItem 并将 IB 中的 IBOutlet 与 UINavigationItem 连接起来。

//
//  NavBarViewController.h

#import <UIKit/UIKit.h>

@interface NavBarViewController : UIViewController {
  UINavigationItem *navBar;
}

@property (nonatomic, retain) IBOutlet UINavigationItem *navBar;

-(IBAction) clickedOne: (id)sender;
-(IBAction) clickedTwo: (id)sender;

@end

//
//  NavBarViewController.m

#import "NavBarViewController.h"

@implementation NavBarViewController

@synthesize navBar;

-(IBAction) clickedOne: (id)sender {
    navBar.title = @"1";
}

-(IBAction) clickedTwo: (id)sender {
    navBar.title = @"2";
}


- (void)didReceiveMemoryWarning {
    // Releases the view if it doesn't have a superview.
    [super didReceiveMemoryWarning];

    // Release any cached data, images, etc that aren't in use.
}

- (void)viewDidUnload {
    // Release any retained subviews of the main view.
    // e.g. self.myOutlet = nil;
}


- (void)dealloc {
    [super dealloc];
}

@end