#import <UIKit/UIKit.h>
@class FirstViewController;

@interface RootViewController : UIViewController

@property (strong, nonatomic) UINavigationController *nav;

- (IBAction)btnClick:(UIButton *)sender;

@end

- (IBAction)btnClick:(UIButton *)sender {
   
    //創(chuàng)建一個viewcontroller
    FirstViewController *fristview =[[[FirstViewController alloc] init] autorelease];
  
   
    //初始化UINavigationController(方式一)
    self.nav = [[[UINavigationController alloc] initWithRootViewController:fristview] autorelease];
   
   
    //初始化UINavigationController(方式二)
  //  self.nav = [[[UINavigationController alloc] init] autorelease];
  //  [self.nav pushViewController:fristview animated:YES];

   
    //初始化UINavigationController(方式三,失敗,xib文件加載失敗,原因暫時不明)
   // self.nav = [[[UINavigationController alloc] initWithNibName:@"FirstViewController" bundle:nil] autorelease];
   
   
    //跳轉(zhuǎn)到FirstView頁面
    [self presentViewController:self.nav animated:YES completion:nil];
   
   
    //這種寫法一般用于往view里添加一些小控件,如button  label textField之類的,不適宜用于頁面跳轉(zhuǎn)
    // [self.view addSubview:self.nav.view];
   
   
}

- (void)viewDidLoad 
{ 
    [super viewDidLoad]; 
    // Do any additional setup after loading the view. 
    [self.navigationController.navigationBar setTranslucent:NO];//設(shè)置navigationbar的半透明 
    self.title = @"navigationcontroller";//設(shè)置navigationbar上顯示的標題 
    [self.navigationController.navigationBar setBarTintColor:[UIColor purpleColor]];//設(shè)置navigationbar的顏色 
    self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonItemStyleDone target:self action:Nil];//設(shè)置navigationbar左邊按鈕 
    self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonItemStylePlain target:self action:Nil];//設(shè)置navigationbar右邊按鈕 
    [self.navigationController.navigationBar setTintColor:[UIColor whiteColor]];//設(shè)置navigationbar上左右按鈕字體顏色 
} 

NSArray *arr = [NSArray arrayWithObjects:@"1",@"2", nil nil]; 
    UISegmentedControl *segment = [[UISegmentedControl alloc]initWithItems:arr]; 
    self.navigationItem.titleView = segment;//設(shè)置navigation上的titleview 

@interface SecondViewController : UIViewController 
@property (copy,nonatomic) NSString *str; 
@end 
 

- (void)viewDidLoad 
{ 
    [super viewDidLoad]; 
    // Do any additional setup after loading the view. 
    self.title = @"second"; 
    UIButton *aBUTTON = [[UIButton alloc]initWithFrame:CGRectMake(30, 30, 50, 30)]; 
    [aBUTTON setTitle:_str forState:UIControlStateNormal]; 
    [aBUTTON addTarget:self action:@selector(clicked) forControlEvents:UIControlEventTouchUpInside]; 
    [self.view addSubview:aBUTTON]; 
} 

- (void)clicked{ 
    SecondViewController *second = [[SecondViewController alloc]init]; 
    [self.navigationController pushViewController:second animated:YES]; 
    second.str = @"hello!!"; 
    [second release]; 
} 

- (void)clicked{ 
    [self.navigationController popViewControllerAnimated:YES]; 
}