Design Pattern - Objective-C - MVC Model View Cont

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've tried to apply it to a simple program, a window that have a label and a button. The button increase a counter and the label shows the value of it.

I tried in 2 different ways.

In the first case ( the example works ) i melt the View and the Controller. As i said, the example works, but i want you guys to tell me if it's a correct implementation for MVC or it's not following the right design.

The second example has Model View and Controller as 3 separated class, but the example doesnt work because the V and the C import itself, so i would love you guys to tell me where i'm doing wrong.

first version: model, view-controller

//Model.h
#import <Foundation/Foundation.h>

@interface Model : NSObject {
    int _counter;
}

-(void)setCounter:(int)valueCounter;
-(int)getCounter;
-(void)increaseCounter;
@end

//Model.m
#import "Model.h"
@implementation Model {}

-(void)setCounter:(int)valueCounter { _counter = valueCounter; }
-(int)getCounter { return _counter; }
-(void)increaseCounter{ _counter ++; }
@end


//ViewController.h
#import <UIKit/UIKit.h>
#import "Model.h"

@interface ViewController : UIViewController {
    IBOutlet UIButton *_button;
    IBOutlet UILabel *_label;
    Model *myModel;
}

-(IBAction)send:(id)sender;
@end

//ViewController.m
#import "ViewController.h"
@interface ViewController ()
@end

@implementation ViewController
- (void)viewDidLoad {
    [super viewDidLoad];
     myModel = [[Model alloc]init];
    _label.text = [NSString stringWithFormat:@"%d",[myModel getCounter]];
}

- (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; }

- (IBAction)send:(id)sender{
    [myModel increaseCounter];
    _label.text = [NSString stringWithFormat:@"%d",[myModel getCounter]];
}

@end

Is this way a correct Pattern for MVC ? The code works, but before i start more complex apps i want to make sure i code it in a good way. This is how i would do this app, my way of MVC. is it bad? good? how to change or fix it?

Second Version: Model, View, Controller separated

----> This is the Model

//Model.h
#import <Foundation/Foundation.h>

@interface Model : NSObject {
    int _count;
}

-(void)setCount:(int)value;
-(int)getCount;
-(void)increaseCount;

@end

//Model.m
#import "Model.h"

@implementation Model

-(void)setCount:(int)value { _count = value; }
-(int)getCount { return _count; }
-(void)increaseCount { _count = _count++; }

@end

----> This is the View

//View.h
#import <UIKit/UIKit.h>
#import "Controller.h"

@interface ViewController : UIViewController{
    IBOutlet UILabel *label;
    IBOutlet UIButton *button;
    Controller *myController;
}

@end

//View.m
#import "ViewController.h"
#import "Controller.h"

@interface ViewController ()
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    myController = [[Controller alloc]init];
}

- (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; }


-(IBAction)pressButton:(id)sender{
    label.text = [NSString stringWithFormat:@"%d",[myController actionIncrease]];
}

@end

----> This is the Controller

//Controller.m
#import <Foundation/Foundation.h>

@class "Model.h"
@class  "ViewController.h"

@interface Controller : NSObject {
    Model *_mymodel;
    UIViewController *_myviewController;
}

-(int)actionIncrease;

@end

//Controller.m
#import "Controller.h"
#import "Model.h"

@implementation Controller

-(id)init{
    _mymodel = [[Model alloc]init];
}

-(int)actionIncrease {
    [_mymodel increaseCount];
    return [_mymodel getCount];    
}

@end

this version doesn't work because the classes view and controller import each other and the compiler gives me a warning

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 <Foundation/Foundation.h>

@interface MyModelObject : NSObject

@property (nonatomic) int count; 

@end

UIView (view):

//MyView.h
#import <UIKit/UIKit.h>

@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 <Foundation/Foundation.h>

#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