SimpleController.h

// SimpleController.h
#import <Foundation/Foundation.h>
#import "Polygon.h"

@interface SimpleController : NSObject {
    Polygon *myPolyObject;
}

- (void)testPassingVarToViewObject;
- (void)testAnotherWayPassingVarToViewObject;

@end

SimpleController.m

// SimpleController.m
#import "SimpleController.h"
#import "SimpleView.h"

@implementation SimpleController

- (id)init;
{
    if ( (self = [super init]) == nil )
        return nil;

    myPolyObject = [[Polygon alloc] init];

    return self;
}

- (void)dealloc;
{
    [super dealloc];
    [myPolyObject release];
}

- (void)testPassingVarToViewObject;
{
    SimpleView *myView = [[SimpleView alloc] init];

    myView.viewPolygon = myPolyObject;

    // Do something
    // [myView show];
    
    [myView release];
}

- (void)testAnotherWayPassingVarToViewObject;
{
    SimpleView *myView = [[SimpleView alloc] initWithPolygon:myPolyObject];

    // Do something
    // [myView show];
    
    [myView release];
}

@end

SimpleView.h

// SimpleView.h
#import <Foundation/Foundation.h>
#import "Polygon.h"

@interface SimpleView : NSObject {
    Polygon *viewPolygon;
}

@property (nonatomic, retain) Polygon *viewPolygon;

- (id)initWithPolygon:(Polygon *)polygon;

@end

SimpleView.m

// SimpleView.m
#import "SimpleView.h"

@implementation SimpleView

@synthesize viewPolygon;

// The synthesize above creates a setter and getter for the viewPolygon variable.
// When an object is assigned using these it handles the memory retain automatcally.

- (id)initWithPolygon:(Polygon *)polygon;
{
    if ( (self = [super init]) == nil )
        return nil;

    self.viewPolygon = polygon;

    return self;
}

- (void)dealloc;
{
    [super dealloc];
    [viewPolygon release];
}

@end