1 前言
UINavigationController會讓App從一個試圖控制器切換到另一個，在開發中十分常見，今天我們來學習一下這個控件。

2 UINavigation簡介
delegate代碼

.h文件：

[plain]
#import <UIKit/UIKit.h> 
#import "ZYRootViewController.h" 
 
@interface ZYAppDelegate : UIResponder <UIApplicationDelegate> 
 
@property (strong, nonatomic) UIWindow *window; 
@property(nonatomic,strong) ZYRootViewController *zYRootViewController; 
@property(nonatomic,strong) UINavigationController *navigationController; 
 
@end 

#import <UIKit/UIKit.h>
#import "ZYRootViewController.h"

@interface ZYAppDelegate : UIResponder <UIApplicationDelegate>

@property (strong, nonatomic) UIWindow *window;
@property(nonatomic,strong) ZYRootViewController *zYRootViewController;
@property(nonatomic,strong) UINavigationController *navigationController;

@end.m文件：

 

[plain]
@synthesize navigationController; 
@synthesize zYRootViewController; 
 
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions 
{ 
    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]]; 
    // Override point for customization after application launch. 
    self.window.backgroundColor = [UIColor whiteColor]; 
    [self.window makeKeyAndVisible]; 
    self.zYRootViewController = [[ZYRootViewController alloc] initWithNibName:nil bundle:nil]; 
    //實例化導航欄 
    self.navigationController = [[UINavigationController alloc] initWithRootViewController:self.zYRootViewController]; 
    //向當前視圖添加導航欄 
    self.window.rootViewController = self.navigationController; 
//    [self.window addSubview:self.navigationController.view]; 
    return YES; 
} 

@synthesize navigationController;
@synthesize zYRootViewController;

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    // Override point for customization after application launch.
    self.window.backgroundColor = [UIColor whiteColor];
    [self.window makeKeyAndVisible];
    self.zYRootViewController = [[ZYRootViewController alloc] initWithNibName:nil bundle:nil];
    //實例化導航欄
    self.navigationController = [[UINavigationController alloc] initWithRootViewController:self.zYRootViewController];
    //向當前視圖添加導航欄
    self.window.rootViewController = self.navigationController;
//    [self.window addSubview:self.navigationController.view];
    return YES;
}

ZYRootViewController代碼

.m文件：

[plain]
- (void)viewDidLoad 
{ 
    [super viewDidLoad]; 
    // Do any additional setup after loading the view. 
    self.title = @"First";//設置標題 
    [self performSelector:@selector(pushSecondController) withObject:nil afterDelay:3.0f];//3秒後調用自身pushSecondController方法 
} 
 
-(void)pushSecondController{ 
    ZYSecondViewController *zYSecondViewController = [[ZYSecondViewController alloc] initWithNibName:nil bundle:nil]; 
    [self.navigationController pushViewController:zYSecondViewController animated:YES];//向導航欄堆棧推入zYSecondViewController視圖 
} 

- (void)viewDidLoad
{
    [super viewDidLoad];
 // Do any additional setup after loading the view.
    self.title = @"First";//設置標題
    [self performSelector:@selector(pushSecondController) withObject:nil afterDelay:3.0f];//3秒後調用自身pushSecondController方法
}

-(void)pushSecondController{
    ZYSecondViewController *zYSecondViewController = [[ZYSecondViewController alloc] initWithNibName:nil bundle:nil];
    [self.navigationController pushViewController:zYSecondViewController animated:YES];//向導航欄堆棧推入zYSecondViewController視圖
}ZYSecondViewController代碼

.m文件：

[plain]
- (void)viewDidLoad 
{ 
    [super viewDidLoad]; 
    self.title = @"Second"; 
    // Do any additional setup after loading the view. 
    [self performSelector:@selector(goBack) withObject:nil afterDelay:3.0f];//3秒後調用自身goBack方法 
} 
 
-(void)goBack{ 
    [self.navigationController popViewControllerAnimated:YES];//將自身視圖彈出導航欄堆棧 
} 

- (void)viewDidLoad
{
    [super viewDidLoad];
    self.title = @"Second";
 // Do any additional setup after loading the view.
    [self performSelector:@selector(goBack) withObject:nil afterDelay:3.0f];//3秒後調用自身goBack方法
}

-(void)goBack{
    [self.navigationController popViewControllerAnimated:YES];//將自身視圖彈出導航欄堆棧
}運行結果：

最初的效果

 

3秒以後跳到第二個視圖：

 
 

又3秒以後彈出本視圖，顯示初始視圖：