Trying to add a subview, drawRect isn't called

I'm trying to add a subview to my main view. Here's the relevant code from my viewController:

- (void)viewDidLoad {
    [super viewDidLoad];
    MyUIViewSubclass* myView = [[MyUIViewSubclass alloc] init]; 
    [self.view addSubview:开发者_Go百科myView]; // self.view is a simple UIView
    [myView setNeedsDisplay];
}

drawRect in myView doesn't get called.

However, if I use a MyUIViewSubclass as the main view for the viewController (setting it in Interface Builder), drawRect does get called.

What do I need to do to get drawRect called in my subView?

In your subclass you should use the designated initialiser for UIView:

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) 
    {
       //Implementation code...
    }
}

Ok, figured it out. Wasn't setting the frame of my subView.