iOS 导航栏

    //创建一个导航栏
    UINavigationBar *navigationBar=[[UINavigationBar alloc] initWithFrame:CGRectMake(0, 0, 320, 44)];
    //创建一个导航栏集合
    UINavigationItem *navigationItem=[[UINavigationItem alloc] initWithTitle:nil];
    //创建一个导航栏的左边的按钮
    UIBarButtonItem *leftbutton=[[UIBarButtonItem alloc] initWithTitle:@"左边" style:UIBarButtonItemStyleBordered target:self action:@selector(dosomething)];
    //创建一个导航栏的右边的按钮
    UIBarButtonItem *rightbutton=[[UIBarButtonItem alloc] initWithTitle:@"右边" style:UIBarButtonItemStyleBordered target:self action:@selector(dosomething)];
    [navigationItem setTitle:@"导航栏"];
    //向导航栏集合添加 左右两边的按钮
    [navigationItem setLeftBarButtonItem:leftbutton];
    [navigationItem setRightBarButtonItem:rightbutton];
    //把导航栏集合 添加到 导航栏中
    [navigationBar pushNavigationItem:navigationItem animated:NO];
    //视图添加导航栏
    [self.view addSubview:navigationBar];