導航控制器顯示提示

Question

如何在按下按鈕時使我的UINavigationController顯示提示？我已經把我的文字由[[[self navigationController]navigationItem]setPrompt:[NSString stringWithFormat:@"Prompt is working!"]];

編輯： 爲了澄清，我有一個按鈕調用一個IBAction，設置提示如下，但我需要找到一種方法，只要該按鈕被按下時顯示提示：

-(IBAction)test:(id)sender 
{ 
    [[[self navigationController]navigationItem]setPrompt:[NSString stringWithFormat:@"Prompt works!"]]; 
    //I want it to display right after I set it, so I'm missing something and can't figure it out through the documentation 
} 

我已經嘗試[[[self navigationController]navigationBar]pushNavigationItem:nav animated:YES];但拋出一個錯誤，說明Cannot call pushNavigationItem:animated: directly on a UINavigationBar managed by a controller.

Answer 1

您應設置提示的文字是這樣的：

self.navigationItem.prompt = @"This is the title";