IOS導航欄的使用

導航欄包含導航控制器的導航的按鈕。在導航欄中的標題是當前視圖控制器的標題。


示例代碼和步驟

1.創視圖應用程式

2. 現在，選擇應用程式 Delegate.h ，添加導航控制器的屬性，如下所示:

#import <UIKit/UIKit.h>

@class ViewController;

@interface AppDelegate : UIResponder <UIApplicationDelegate>

@property (strong, nonatomic) UIWindow *window;

@property (strong, nonatomic) ViewController *viewController;

@property (strong, nonatomic) UINavigationController *navController;

@end

3. 更新應用程式: didFinishLaunchingWithOptions:方法，在AppDelegate.m檔分配的導航控制器，並使其成為窗口的根視圖控制器，如下所示：

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    self.window = [[UIWindow alloc] initWithFrame:
    [[UIScreen mainScreen] bounds]];
    // Override point for customization after application launch.
    self.viewController = [[ViewController alloc]
    initWithNibName:@"ViewController" bundle:nil];
    //Navigation controller init with ViewController as root
    UINavigationController *navController = [[UINavigationController alloc]
    initWithRootViewController:self.viewController];
    self.window.rootViewController = navController;
    [self.window makeKeyAndVisible];
    return YES;
}

4.現在，通過選擇File -> New ->File... -> Objective C Class 添加新的類檔TempViewController，然後將類命名 TempViewController 與 UIViewController 的子類。

5.在ViewController.h中添加navButon，如下所示

// ViewController.h
#import <UIKit/UIKit.h>

@interface ViewController : UIViewController
{
    UIButton *navButton;
}
@end

6.現在添加方法addNavigationBarItem並在viewDidLoad調用方法

7. 為導航項創建方法

8. 我們還需要創建另一種方法到另一視圖控制器 TempViewController。

9. 更新後的ViewController.m，如下所示:

// ViewController.m
#import "ViewController.h"
#import "TempViewController.h"
@interface ViewController ()

@end
@implementation ViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    [self addNavigationBarButton];
    //Do any additional setup after loading the view, typically from a nib
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

-(IBAction)pushNewView:(id)sender{
   TempViewController *tempVC =[[TempViewController alloc]
   initWithNibName:@"TempViewController" bundle:nil];
   [self.navigationController pushViewController:tempVC animated:YES];
}

-(IBAction)myButtonClicked:(id)sender{
   // toggle hidden state for navButton
   [navButton setHidden:!nav.hidden];
}

-(void)addNavigationBarButton{
   UIBarButtonItem *myNavBtn = [[UIBarButtonItem alloc] initWithTitle:
   @"MyButton" style:UIBarButtonItemStyleBordered target:
   self action:@selector(myButtonClicked:)];

   [self.navigationController.navigationBar setBarStyle:UIBarStyleBlack];
   [self.navigationItem setRightBarButtonItem:myNavBtn];

   // create a navigation push button that is initially hidden
   navButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
   [navButton setFrame:CGRectMake(60, 50, 200, 40)];
   [navButton setTitle:@"Push Navigation" forState:UIControlStateNormal];
   [navButton addTarget:self action:@selector(pushNewView:)
   forControlEvents:UIControlEventTouchUpInside];
   [self.view addSubview:navButton];
   [navButton setHidden:YES];
}
@end

10. 現在當我們運行應用程式時我們就會得到下麵的輸出

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11. 單擊 MyButton 導航按鈕，切換導航按鈕可見性

12. 單擊導航按鈕，顯示另一個視圖控制器，如下所示

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