Objective-C - 获取UIViewController引用 [英] Objective-C – Getting a UIViewController reference

问题描述

我的应用程式版面配置如下：

TabBarController（hold a） - > UINavController for Tab 1（hold a） - > MyOwnListViewController - > UINavController（modally）（hold a） - > ItemAddViewController - > AddItemToItemViewController

也许这不是很清楚，所以为了清楚起见，当应用程序启动时，我在选项卡1和 MyOwnListViewController 是可见的，然后我推+按钮，我以模块的方式到 ItemAddViewController 。从那里我pushViewController AddItemToItemViewController 。现在在这个视图控制器，我想得到一个引用 ItemAddViewController 。

解决方案

您可以修改AddItemToItemViewController的init ***方法，并将它传递给您的ItemAddViewController。

EG：

在AddItemToItemViewController.h中：

  @property（nonatomic，retain）UIViewController * parentController; 
  

在AddItemToItemViewController.m中：

  @synthesize parentController; 
 
  - （id）initWithParentController：（UIViewController *）controller {
 self = [super init]; 
 
 if（self）{
 self.parentController = controller; 
} 
 return self; 
} 
 
  - （void）dealloc {
 [self.parentController release]; 
 [super dealloc] 
} 
  

当在ItemAddViewController实例中调用控制器时：

  UIViewController * controller = [[AddItemToItemViewController alloc] initWithParentController：self]; 
 [self.navigationController pushViewController：controller animated：YES]; 
 [controller release]; 
  

I'm way in deep water here trying to get ahold of a vc.

My App layout looks like this:

TabBarController (holds a) -> UINavController for Tab 1 (holds a) -> MyOwnListViewController -> UINavController (modally) (holds a) -> ItemAddViewController -> AddItemToItemViewController

Maybe that wasn't very clear, so for clarity, when the app starts I'm on tab 1 and the MyOwnListViewController is visible, then I push a + button in the navigation bar and I'm taken modally to the ItemAddViewController. From there I pushViewController AddItemToItemViewController. Now in this view controller I want to get a reference to ItemAddViewController.

What would be the easiest way to get a reference to it?

解决方案

You could modify the init*** method of your AddItemToItemViewController and pass it the reference on your ItemAddViewController.

E.G :

In AddItemToItemViewController.h :

@property (nonatomic, retain) UIViewController *parentController;

In AddItemToItemViewController.m :

@synthesize parentController;

-(id) initWithParentController:(UIViewController *) controller{
    self = [super init];

    if(self){
        self.parentController = controller;
    }
    return self;
}

-(void) dealloc{
    [self.parentController release];
    [super dealloc];
}

When calling your controller inside your ItemAddViewController instance :

UIViewController *controller = [[AddItemToItemViewController alloc] initWithParentController:self];
[self.navigationController pushViewController:controller animated:YES];
[controller release];

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