在iOS上，如果将Interface Builder用于UIViewController的视图，我们如何为其实现drawRect？

Question

If we use Interface Builder to edit the content in the view, then how do we add a drawRect to that UIView object? (Probably we want a new class FooView that subclasses UIView -- but how will the .xib content be placed on this view?)

Answer 1

Adding "content" to the view controller's view in the xib just involves adding subviews - these are not affected by drawRect: .

That said, to set a custom class as the main view property of a view controller, just select the view in the xib, go to the identity inspector, and change the class from UIView to your custom class.

Answer 2

At beginning i want to point that i have done something like this(subclassing) with UIButton and since UIButton is inherited from UIView this must be possible with UIView too.

(after subclassing UIView) create an instance of your subclass on your view controller and add this instance to ViewController as subview. At this point you can call your specific drawRect: method, which you have declared on your subclass