如何使用左侧的后退按钮创建导航栏？

Question

在我的应用程序中，我尝试使用导航栏后退按钮从第二个 ViewController 导航到第一个 ViewController，但是在我的应用程序的 XIB 中将导航栏拖放到 ViewController 上时，我只能通过标题。

我做错了什么？我正在使用 Xcode 4.6。和 .xib 文件来设计视图。这是我现在得到的：

这就是我要找的东西：

Answer 1

导航控制器提供了一个默认的导航栏和一个后退按钮。但是后退按钮标题的变化有点乱

程序化

   UIStoryboard *astoryBoard=[UIStoryboard storyboardWithName:@"MainStoryboard" bundle:[NSBundle mainBundle]];
    ViewController2 *vc=[astoryBoard instantiateViewControllerWithIdentifier:@"ViewController2"];
  
    
    UIBarButtonItem *newBackButton = [[UIBarButtonItem alloc] initWithTitle: @"Master" style: UIBarButtonItemStyleBordered target: nil action: nil];
    [[self navigationItem] setBackBarButtonItem: newBackButton];
    [self.navigationController pushViewController:vc animated:YES];

如果您使用的是 segue，请将这些行添加到父 VC

 UIBarButtonItem *newBackButton = [[UIBarButtonItem alloc] initWithTitle: @"Master" style: UIBarButtonItemStyleBordered target: nil action: nil];
    [[self navigationItem] setBackBarButtonItem: newBackButton];

只是为了回来

代码方面

  UIStoryboard *astoryBoard=[UIStoryboard storyboardWithName:@"MainStoryboard" bundle:[NSBundle mainBundle]];
        ViewController2 *vc=[astoryBoard instantiateViewControllerWithIdentifier:@"ViewController2"];
        [self.navigationController pushViewController:vc animated:YES];

不是故事板

创建第二个 VC 的实例，然后使用此代码

YourViewController *VC=[[YourViewController alloc]initWithNibName:@"yournibname" bundle:[NSBundle mainBundle]];
        [self.navigationController pushViewController:VC animated:YES];

Answer 2

将此代码添加到您的 BUS2AppDelegate.h 文件中

@interface BUS2AppDelegate : UIResponder <UIApplicationDelegate>
{
     UINavigationController *navController;   //you have added this code?
}
@property (strong, nonatomic) UIWindow *window;

@property (strong, nonatomic) ViewController *viewController;
    @end

在 BUS2AppDelegate.m 文件中

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
     self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];

        // Override point for customization after application launch.
    self.viewController = [[BUS2ViewController alloc] initWithNibName:@"BUS2ViewController" bundle:nil];

    // View Controller with each Navigational stack support.
    navController = [[UINavigationController alloc]
                     initWithRootViewController:self.viewController];
    self.window.rootViewController = navController;
    [self.window makeKeyAndVisible];

    return YES;
}

在您的第一个视图控制器中添加此代码

#import "AAlesund.h"

- (IBAction)secodVCBtnClicked:(id)sender {


    AAlesund *aAlesund = [[AAlesund alloc] initWithNibName:@"AAlesund" bundle:nil];

self.navigationItem.title = @"Master";
    [self.navigationController pushViewController:aAlesund  animated:NO];
}

要在第二个视图控制器的导航栏中添加标题，请添加此代码

- (void)viewDidLoad
{
    [super viewDidLoad];

    UILabel *nav_title1 = [[UILabel alloc] initWithFrame:CGRectMake(60, 10, 220, 25)];
    nav_title1.font = [UIFont fontWithName:@"Arial-BoldMT" size:18];
    nav_title1.textColor = [UIColor whiteColor];
    nav_title1.adjustsFontSizeToFitWidth = NO;
    nav_title1.textAlignment = UITextAlignmentCenter;
    nav_title1.text = @"Detail";
    nav_title1.backgroundColor = [UIColor clearColor];
    self.navigationItem.titleView = nav_title1;
}

这是输出。