Question

Here’s my situation:

I have a protocol with a class method that parses an NSDictionary and returns an object that performs my protocol:

@protocol RCParsableObject <NSObject>
/** 
  Parses an object from an NSDictionary representation
  Return: A object created from the NSDictionary representation
 */
+(id<RCParsableObject>)parseObjectFromDictonary:(NSDictionary*)object;
@end

At a part of my code I have the name of a class that performs that protocol in an NSString:

//dict is the dictionary I want to parse
Class class= NSClassFromString(type);
if ([class conformsToProtocol:@protocol(RCParsableObject)]) {
   //NSObject* object = [class parseObjectFromDictionary:dict];//Obviously that don't works but shows what I want     
}

Inside the if I want to perform the Class method of the protocol that I know it can be performed because of the if. How I can do that? It’s a equivalent to:

NSObject * object = [class performSelector:_selector];

For a Class object?

Answer 1

That is how you’d do it, except you’ll want to type the variable holding the return value as id or id<RCParsableObject>. No need for performSelector: or anything like it — that’s useful for when the selector is dynamically chosen, which isn’t the case here.