Question

我创建了一个基于视图的应用程序。我在视图和两个按钮上放置了一个导航栏。按下按钮后，我想更改导航栏的标题。在IB中，我将按钮与相应的动作连接起来。调试显示调用了操作，但导航栏的标题未更改。

请帮忙！

//
//  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

我找到了。我使用了UINavgationItem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

更改UINavigationBar的标题

1 个答案: