Objective-C dynamic properties at runtime?

Question

Is it possible to create an Objective-C class that can have an arbitrary number of dynamic properties at runtime?

I want to be able to call mySpecialClass.anyP

Answer 1

You're asking different things. If you want to be able to use the bracket syntax mySpecialClass[@"anyProperty"] on instances of your class, it is very easy. Just implement the methods:

 - (id)objectForKeyedSubscript:(id)key
 {
      return ###something based on the key argument###
 }

 - (void)setObject:(id)object forKeyedSubscript:(id )key
 {
      ###set something with object based on key####
 }

It will be called everytime you use the bracket syntax in your source code.

Otherwise if you want to create properties at runtime, there are different ways to proceed, take a look at NSObject's forwardInvocation: method, or look at the Objective-C Runtime Reference for functions to dynamically alter a class...