引用navigationController对象

 

我以前在一个controller中引用一个naviController总是要通过delegate来取得：

 

[[[[UIApplication sharedApplication] delegate ] naviController] pushViewController: printView animated:TRUE];

 

 

今天在源代码中发现有注释是这样的：

 

@property(nonatomic,readonly,retain) UINavigationController *navigationController; // If this view controller has been pushed onto a navigation controller, return it.

 

发现在控制器中就直接有这个对象属性了：

 

[self.navigationController pushViewController: printView animated:TRUE];

 

[self.navigationController presentModalViewController:self.worldCitiesListNavigationController animated:YES];

 

不知道的东西太多了。