Why is *drawRect* not being called from the ViewController?

Question

I have an iPad app (XCode 5, iOS 7, Storyboards and ARC). I have a UIPopover created in a UIViewController, and when I tap a button it correctly displays the popover.

Now, I want to draw a grid in that popover; I know I have to add code to drawRect do do the drawing, and do a setNeedsDisplay to get the drawing done. However, it's not working!

My question is why is drawRect not being called when from [popoverView setNeedsDisplay]; ? Both methods are in the same UIViewController class.

Here is the code that is supposed to call the drawRect

//  create popover
UIViewController* popoverContent = [[UIViewController alloc] init];
UIView *popoverView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 650, 416)];
popoverView.backgroundColor = [UIColor whiteColor];
popoverContent.preferredContentSize = CGSizeMake(650.0, 416.0);

//  draw the lines, etc on the popoverContent
[popoverView setNeedsDisplay];

//  create the popover controller and attach the popover content to it
popoverController = [[UIPopoverController alloc] initWithContentViewController:popoverContent];
popoverController.delegate = (id)self;
[popoverController setPopoverContentSize:CGSizeMake(650, 416) animated:NO];
[popoverController presentPopoverFromRect:CGRectMake(650, 416, 10, 50) inView: obViewOpenAppts
                 permittedArrowDirections:UIPopoverArrowDirectionUp animated:YES];

I have a breakpoint in drawRect so I know it's not being called.

What am I doing wrong?

Answer 1

drawRect: is a UIView method, not a UIViewController method. If you want to override it you have to subclass UIView, and then create it like this:

MyUIViewSubclass *popoverView = [[MyUIViewSubclass alloc] initWithFrame:CGRectMake(0, 0, 650, 416)];