//RootViewController.m

- (void)viewDidLoad {
// Do any additional setup after loading the view.
[super viewDidLoad];
// Do any additional setup after loading the view.
[self.navigationController.navigationBar setTranslucent:NO];//设置navigationbar的半透明

self.title = @"RootViewController";//设置navigationbar上显示的标题

[self.navigationController.navigationBar setBarTintColor:[UIColor purpleColor]];//设置navigationbar的颜色

self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonItemStyleDone target:self action:Nil];//设置navigationbar左边按钮

self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonItemStylePlain target:self action:Nil];//设置navigationbar右边按钮

[self.navigationController.navigationBar setTintColor:[UIColor whiteColor]];//设置navigationbar上左右按钮字体颜色

//self.navigationItem.rightBarButtonItem setTarget:<#(id)#>
//动态添加一个按钮


UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];

button.frame = CGRectMake(0, 300, 300, 50);

[button setTitle:@"新添加的动态按钮" forState: UIControlStateNormal];

button.backgroundColor = [UIColor clearColor];

button.tag = 2000;

[button addTarget:self action:@selector(clicked:) forControlEvents:UIControlEventTouchUpInside];

[self.view addSubview:button];

}

- (void)clicked:(id) sender{
SecondViewController *second = [[SecondViewController alloc]init];
[self.navigationController pushViewController:second animated:YES];
//second.str = @"hello!!";
[second release];
}
//这个是新按钮的响应函数
-(IBAction) buttonClicked:(id)sender {
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"提示"
message:@"单击了动态按钮！"
delegate:self
cancelButtonTitle:@"确定"
otherButtonTitles:nil];
[alert show];
[alert release];
}

关于navigationbar的属性