rightBarButtonItem未在视图上显示

Question

我试图用下面的代码在视图中以编程方式实现一个标题和rightBarButtonItem，但是没有显示标题和按钮，其他所有东西(包括navigationBar和tabBarItem属性)都可以工作。我不知道我哪里出了问题。

- (void)viewDidLoad {
  [super viewDidLoad];

  self.navigationController.navigationBar.barTintColor = COLOR_NAVBAR_BACKGROUND;
  self.navigationController.navigationBar.tintColor = COLOR_NAVBAR_BUTTON;
  self.navigationController.navigationBar.titleTextAttributes = @{NSForegroundColorAttributeName:COLOR_NAVBAR_TITLE};
  self.navigationController.navigationBar.translucent = NO;

  self.tabBarItem.title = nil;
  [self.tabBarItem setImage:[UIImage imageNamed:@"tab_group"]];
  [self.tabBarItem setSelectedImage:[UIImage imageNamed:@"tab_group"]];
  self.tabBarItem.title = @"Group";

  self.title = @"Group";

  self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"New" style:UIBarButtonItemStylePlain target:self action:@selector(actionNew)];
}

Answer 1

检查并尝试

 - (void)viewDidLoad
{
    [super viewDidLoad];



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

     [self.navigationItem setRightBarButtonItem:rigthButtonClicked];


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

 [self.navigationItem setRightBarButtonItem:leftButtonClicked];
}

两个按钮在这里

-(void)rigthButtonClicked:(UIBarButtonItem *)button
{

    NSLog(@"RigthButtonClicked");
}

-(void)leftButtonClicked:(UIBarButtonItem *)button
{


    NSLog(@"leftButtonClicked");
}