iOS navigationbar添加实现

#ViewController.m

- (void)viewWillAppear:(BOOL)animated{

[super viewWillAppear:animated];

UIViewController *rootView = [[UIViewController alloc] init];

rootView.title = @"Root View";

self.navController = [[UINavigationController alloc] init];

[self.navController pushViewController:rootView animated:YES];

[self.view addSubview:self.navController.view];

self.navigationController.navigationBarHidden = YES;

UIBarButtonItem *leftButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemAction target:self action:@selector(selectLeftAction:)];

leftButton.title = @"123";

rootView.navigationItem.leftBarButtonItem = leftButton;

UIBarButtonItem *rightButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemAdd  target:self action:@selector(selectRightAction:)];

rootView.navigationItem.rightBarButtonItem = rightButton;

}