MVC: Passage of the methods in different classes

I'm implementing an app iOS with the MVC design pattern.

The app has 5 interfaces and I proceeded in this way:

• AppDelegate (CONTROLLER);
• WebServiceModel (MODEL);
• 5 interfaces that represent the 5 views of the app (VIEWS).

In the model I have implemented a method that sends messages to the web service to request the data. According to the MVC, the Controller must receive data from the Model and send them to the View, so in the Controller I have implemented a method that invokes the method of the Model. In the View I instantiate an object Controller and call the Controller method. When the app starts, Xcode starts up only the commands of the method of AppDelegate (Controller) without reading the call to the Model method.

I apologize if the reasoning is twisted. In summary:

// AppDelegate.h

#import "WebServiceModel.h"
@interface AppDelegate: UIResponder <UIApplicationDelegate> {
WebServiceModel *model;
}

@property (retain, nonatomic) WebServiceModel *model;
- (void) func;
_________________

// AppDelegate.m

@implementation AppDelegate
@syntesize model;

- (void) func {
    NSLog(@"OK!");
    [model function];
}
@end
_________________

// WebServiceModel.h

#import "AppDelegate.h"
@interface WebServiceModel: NSObject <NSXMLParserDelegate> {
AppDelegate *controller;
}

- (void) function;
_________________

// WebServiceModel.m

@implementation WebServiceModel

- (void) function {
    NSLog(@"YES!");
    //other instructions
}
@end
_________________

// View Controller.h

#import "AppDelegate.h"
@interface ViewController: UIViewController {
AppDelegate *controller;
}

_________________

// ViewController.m

@implementation ViewController

- (void) viewDidLoad {
    NSLog(@"OH!");
    controller = (AppDelegate *) [[UIApplication sharedApplication] delegate];
    [controller func];
}
@end

When the app starts, in "All Output" you see only "OH!" and "OK!", but no "YES!".

Because the Model's method "function" isn't called?

Thanks to those who answer me!