rightBarButtonItem在视图上不显示

Question

我试图以编程方式在视图中使用以下代码实现标题和rightBarButtonItem，但标题和按钮未显示，其他所有内容（包括navigationBar和tabBarItem属性）均可使用。无法弄清楚我出错的地方。

- (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

检查并重

- (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Button这里

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

    NSLog(@"RigthButtonClicked"); 
} 

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


    NSLog(@"leftButtonClicked"); 
}