How to put "M" in MVC using Interface Builder

Question

I agree with the answers given in What is the best way to communicate between view controllers? but what if I use Interface Builder to develop my Views app?

Without using an application delegate, how can I refer to model objects from Controller objects?

As far as I can tell, I can't put Init user methods that use dependency injection to pass model references to IB.

Forgive me, because I feel that I am missing something very basic here. I looked at the Apple documentation for IB but did not find a clear answer.

Answer 1

In the article, your recommendation is good - like you, I like to enter the model into the controller (an old habit from Smalltalk days - in particular, Dolphin Smalltalk follows this pattern quite widely).

I found that most of my controllers have init methods, such as:

- (id)initWithItem:(id<Nameable>)item addingTo: (id<ModelContainer>)model {
    if (self = [self initWithNibName:@"ItemEditTableToolbarView" bundle:nil]) {
        self.namedItem = item;
        self.container = model;
    }

    return self;
}

Then you can call your controller as follows:

ReDoListEditController *itemViewController = [[ReDoListEditController alloc] initWithItem: item addingTo: model];
    [self.navigationController pushViewController: itemViewController animated: YES];
    [itemViewController release];

, Nib init ( , , , - . - Dolphin, ( ) - init init . , iPhone IB, .

, ( , ).

• XCode ( , )

• "YourAppDelegate.m" applicationDidFinishLaunching: - :

  viewController = [[AppRootViewController alloc] initWithModel: [ ]]; viewController.view.frame = [[UIScreen mainScreen] applicationFrame];

  [window addSubview: viewController.view];

  [ makeKeyAndVisible];

, , ( ):

• MainWindow.xib( , MainWindow - , IB)
• .plist MainWindow.xib( ).

• main.m UIApplicationMain ( ) - :

  int retVal = UIApplicationMain (argc, argv, nil, @ "YourAppDelegate" );

• "YourAppDelegate.m" applicationDidFinishLaunching: - :

  window = [[UIWindow alloc] initWithFrame: [[UIScreen mainScreen] bounds]];

  viewController = [[AppRootViewController alloc] initWithModel: [ ]]; viewController.view.frame = [[UIScreen mainScreen] applicationFrame];

  [window addSubview: viewController.view];

  [ makeKeyAndVisible];

UIApplication:

- (MyModel *)model;

( ), , .

viewModel = [[UIApplication sharedApplication] model];

, , , , , .

Answer 2

InterfaceBuilder V MVC. , IB, . - IB . C MVC , .

Answer 3

IB. , , . ( ) . awakeFromNib, , init .