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Editorial Team
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Asked: 2026-05-15T22:00:00+00:00

In my application, I need to return the Class as a return type like:

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In my application, I need to return the “Class” as a return type like:

Application.m:

+ (Class)getParserClass {
  return [NCCurrencyParser class];
}

NCCurrencyParser.m:

@interface NCCurrencyParser NSObject <NCParser>
@protocol NCParser
  +(NSNumber *)parserNumber:(NSNumber *)number;

in the caller method:

Class parserClass = [Application getParserClass];
[parserClass parserNumber:1.0];

But then the compiler gives me the error that parserClass may not respond to parseNumber. How can I force the Class have to adopt to some protocol like : Class <NCParser> (but it doesn’t work)

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1 Answer

  1. Editorial Team

    Class objects in Objective-C are first class objects, and can can implement protocols like any other Objective-C object (id, NSObject*, …)

    So just do whatever you would normally do for any other Object protocol, ie:

    + (Class<NCParser>)getParserClass {
  return [NCCurrencyParser class];
}

    And

    Class<NCParser> parserClass = [Application getParserClass];
[parserClass parserNumber:1.0];

    Build/Compiled/Tested on xcode 3.2.3, iPhone Simulator 4.0, GCC 4.2

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