從UIButton獲取對UIBarButtonItem的引用？

Question

我已經創建了基於UIButton的UIBarButtonItem。我如何在事件處理程序中獲得UIBarButtonItem（!!!）的引用？

UIButton *brigthnessButton = [[UIButton alloc] 
             initWithFrame:CGRectMake(0, 0, 32, 32)]; 
[brigthnessButton setImage:newImage forState:UIControlStateNormal]; 
forState:UIControlStateSelected]; 
[brigthnessButton addTarget:self action:@selector(createShortcut:) 
        forControlEvents:UIControlEventTouchUpInside]; 
shortCut = [[UIBarButtonItem alloc] initWithCustomView:brigthnessButton]; 

- (void)createShortcut:(UIButton *)button { 
    UIBarButtonItem *b = ??? 
} 

Answer 1

對於你的情況

shortCut = [[UIBarButtonItem alloc] initWithCustomView:brigthnessButton]; 
     [self.navigationItem setLeftBarButtonItem:shortCut];//if Left button 

- (void)createShortcut:(UIButton *)button { 

    UIBarbuttonItem *b = self.navigationItem.leftBarButtonItem; 
}