Issue while implementing MVC - iphone

Question

I am facing an issue while implementing MVC. I created a UIView subclass and have designed my custom view. I created a UIViewController subclass and pointed its view to my custom view class. Finally I created a NSObject subclass and created a model for my controller. When i am running the app, i am getting a black screen... Any idea on this?
==My Model==
- (id) init
{
imgArray = [[NSMutableArray alloc] initWithObjects: [UIImage imageNamed:#"scene.jpg"],
[UIImage imageNamed:#"scene1.jpg"],
[UIImage imageNamed:#"scene2.jpg"], nil];
return self;
}
==My Controller==
- (void)viewDidLoad {
[super viewDidLoad];
NSNotification
CGRect mainFrame = [[UIScreen mainScreen] applicationFrame];
// Get the view
MVCView *myView = [[MVCView alloc] initWithFrame:mainFrame];
// Get the data
MVCModel *myModel = [[MVCModel alloc] init];
myView.myImgView.image = [myModel.imgArray objectAtIndex:0];
//[self.view addSubview:myView];
[myView setNeedsDisplay];
self.view = myView;
self.title = #"MVC";
}
==My View==
- (id)initWithFrame:(CGRect)frame {
if ((self = [super initWithFrame:frame])) {
// Initialization code
CGRect imgFrame = CGRectMake(5, 20, 150, 150);
//myImgView.image = [UIImage imageNamed:#"scene.jpg"];
myImgView.frame = imgFrame;
CGRect lblFrame = CGRectMake(5, 150, 50, 50);
myLabel.text = #"Nature is beautiful";
myLabel.frame = lblFrame;
CGRect sldFrame = CGRectMake(5, 200, 50, 50);
mySlider.minimumValue = 0;
mySlider.maximumValue = 100;
mySlider.frame = sldFrame;
}
return self;
}
// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect {
// Drawing code
CGPoint imgPoint = CGPointMake(10, 20);
[self.myImgView drawAtPoint:imgPoint];
CGPoint lblPoint = CGPointMake(10, 160);
[self.myLabel drawAtPoint:lblPoint];
CGPoint sldPoint = CGPointMake(10, 210);
[self.mySlider drawAtPoint:sldPoint];
}

Answer 1

Have you set your UIViewController's view as a subview of the Window's view that comes with your AppDelegate in your application:didFinishLaunchingWithOptions:?

Answer 2

I got the issue... Actually, i was not allocating memory to my UIView subclass components and was trying to use drawAtPoint method. Once i allocated memory to and added them as a subview of my view class, i got the correct screen displayed.