Design Pattern - Objective-C - MVC Model View Controller

Question

Hi I already read tutorials around the web on MVC and already read the topics on here. I think i got the concept of the MVC but i\'m not sure of its implementation.

I\'v

Answer 1

Simply: UIViewController is not your view, it's your controller

Think of the UIViewController as a puppeteer and the UIView as the puppet.

• UIViewController controls WHAT is displayed on the UIView
• UIView's main purpose is to contain subviews.
• NSObject can be used by any class, but should be used by the UIViewController.

Admittedly, I understood it much better after completing codeschool's tutorial http://www.codeschool.com/courses/try-ios. I highly recommend this simple hands-on approach.

Let's break it down:

Note: Here we utilize @property declarations instead. These will save you from writing your own setter and getter methods. (unless you need to override them for custom functionality)

NSObject (model):

//MyModelObject.h
#import 

@interface MyModelObject : NSObject

@property (nonatomic) int count; 

@end

UIView (view):

//MyView.h
#import 

@interface MyView : UIView

// holds it's own subviews
@property (strong, nonatomic) UIView *anotherView;
@property (strong, nonatomic) UIImageView *myImageView;

@end

UIViewController (controller, it all comes together here!):

//MyViewController.h
#import 

#import "MyView.h"  // your custom view
#import "MyModel.h" // your custom model

@interface MyViewController : UIViewController

@property (strong, nonatomic) MyView *myView 
// see how the view is "owned" by the view controller?

@end



//MyViewController.m

@implementation MyViewController 

@synthesize myView;


- (void) someMethod {

    [myView doSomething]; 

}

@end