Question

Lets say I have a custom control called FooBox. It is just a square on the screen. It has some properties like color, border, etc. When I change the properties, I want the FooBox to redraw itself to reflect its new properties. Is there a way to do that without writing custom setters and putting [self setNeedsDisplay:YES] into all of them?

Answer 1

Two other ways:

1. Have whatever is sending the view the accessor message send setNeedsDisplay:YES to it immediately after. Not always possible, and no less of a hassle.
2. Override setValue:forKey: to add the setNeedsDisplay: message to it, and use that to set the view’s properties. This will require boxing up any numeric or structure values, which is trading one hassle for another.

So, effectively, no.