方便切換UIViewController。為一個stack型態的容器，使用者視角從stack的入口看下去，所以後來放入的view會蓋過舊的view而被使用者看到，相對的回上一個view時，上層的view會被取消掉而不存在：
使用範例：
新增一個繼承UIViewController的類別Controller_A，連同Xib一起產生；同樣的也新增一個Controller_B。在A的Xib中拉入button，定義button的action
#import "Controller_B.h" - (IBAction)callController:(id)sender { Controller_B* conB = [[Controller_B alloc] initWithNibName:@"Controller_B" bundle:nil]; [self.navigationController pushViewController:conB animated:YES]; // UIViewController中有navigationController這個property，用來將Controller放入UINavigationController的stack中 // [conB release]; // If no ARC } |
@interface AppDelegate : UIResponder <UIApplicationDelegate> { UINavigationController* navController; } |
#import "Controller_A.h" - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { // Override point for customization after application launch. Controller_A* conA = [[Controller_A alloc] initWithNibName:@"Controller_A" bundle:nil]; navController = [[UINavigationController alloc] initWithRootViewController:conA]; //初始化時將conA物件放入navController self.window.rootViewController = navController; //將navController放入主畫面中 [self.window makeKeyAndVisible]; return YES; } |
自訂UINavigationBar樣式 -----
在採用UINavigateController時，畫面上方會出現條bar，可以自行定義bar裡的內容，分別有leftBarButtonItem、titleView、rightBarButtonItem
titleView：
在UIViewController之中提供navigationItem.title property來設定title
- (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view from its nib. self.navigationItem.title = @"Controller A"; } |
leftBarButtonItem或rightBarButtonItem：
使用UIBarButtonItem，並將navigationItem.rightBarButtonItem指向UIBarButtonItem
- (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view from its nib. self.navigationItem.title = @"Controller A"; UIBarButtonItem* rightBtn = [[UIBarButtonItem alloc] initWithTitle:@"About" style:UIBarButtonItemStylePlain target:self action:@selector(about:)]; //style參數決定按鈕的樣式，target與action設定呼叫的方法 self.navigationItem.rightBarButtonItem = rightBtn; //將rightBtn指向navigationItem.rightBarButtonItem property } -(void) about:(id) sender { NSLog(@"Hello I am Controller A"); } |
改變back button：
同樣使用UIBarButtonItem來改變原有的back button
- (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view from its nib. self.navigationItem.title = @"Controller A"; UIBarButtonItem* rightBtn = [[UIBarButtonItem alloc] initWithTitle:@"About" style:UIBarButtonItemStylePlain target:self action:@selector(about:)]; //style參數決定按鈕的樣式，target與action設定呼叫的方法 self.navigationItem.rightBarButtonItem = rightBtn; //將rightBtn指向navigationItem.rightBarButtonItem property UIBarButtonItem* backBtn = [[UIBarButtonItem alloc] initWithTitle:@"Back" style:UIBarButtonItemStylePlain target:nil action:nil]; //style和target為UINavigationController控制，故就算給予定義也不會有反應 self.navigationItem.backBarButtonItem = backBtn; } -(void) about:(id) sender { NSLog(@"Hello I am Controller A"); } |
資料出處《Object-C與iOS開發入門》
