導(dǎo)航欄包含導(dǎo)航按鈕,導(dǎo)航控制器,這是一個(gè)堆棧視圖控制器,可入棧和出棧。標(biāo)題導(dǎo)航欄上的標(biāo)題是當(dāng)前視圖的控制器
示例代碼和步驟
1. 創(chuàng)建一個(gè)視圖的應(yīng)用程序
2. 現(xiàn)在選擇APP Delegate.h,添加一個(gè)屬性,導(dǎo)航控制器如下
#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. 現(xiàn)在更新應(yīng)用:didFinishLaunchingWithOptions 方法在 AppDelegate.m 文件分配導(dǎo)航控制器,使窗口的根視圖控制器如下:
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { self.window = [[UIWindow alloc] initWithFrame: [[UIScreen mainScreen] bounds]]; // Override yiibai 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(xiàn)在,添加新的類文件TempViewController通過選擇File -> New ->File... -> Objective C Class,UIViewController 的子類命名類為 TempViewController。
5. 添加一個(gè)UIButton navButon 在ViewController.h 如下
// ViewController.h #import <UIKit/UIKit.h> @interface ViewController : UIViewController { UIButton *navButton; } @end
6. 現(xiàn)在添加一個(gè)方法 addNavigationBarItem 并在 viewDidLoad 中調(diào)用此方法。
7. 創(chuàng)建導(dǎo)航項(xiàng)目動(dòng)作的方法。
8. 我們還需要另一種方法來創(chuàng)建另一個(gè)視圖控制器TempViewController的推送。
9. 更新后的 ViewController.m 如下
// 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)]; <