rightBarButtonItem在視圖上不顯示

Question

我試圖以編程方式在視圖中使用以下代碼實現標題和rightBarButtonItem，但標題和按鈕未顯示，其他所有內容（包括navigationBar和tabBarItem屬性）均可使用。無法弄清楚我出錯的地方。

- (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

檢查並重

- (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]; 
} 

兩個Button這裏

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

    NSLog(@"RigthButtonClicked"); 
} 

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


    NSLog(@"leftButtonClicked"); 
}