KVO for a singleton with multiple observers?

Question

I'm currently contemplating whether to use KVO or NSNotifications to alert several objects in my iOS app when a property of my singleton has changed.

Since all the objects that need to be notified of the change has a reference to the singleton, KVO would seem like the natural solution. However, I've never used KVO with a singleton and multiple observers, so I don't know if that pattern is advisable or even possible.

Is it a good idea (or even possible) to use KVO on a singleton with multiple observers?

Answer 1

Use NSNotifications when you can wait for the event loop.

Use KVO when you need immediate response to the change in state.

Answer 2

Use KVO in this is feasible, as the underlying Cocoa Framework has support built-in to notify the observers and you need not re-invent the wheel