Is it possible to define a property with Class type that conforms to protocol?

问题

For example, I have MyFancyData protocol. How can I specify that MyFancyDataClass property accepts only classes that conforms to this protocol.

@interface MyObject : NSObject

@property Class MyFancyDataClass;

回答1:

@property id<MyFancyData> myFancyDataClass;

回答2:

Do you mean something like this?

@interface MyObject : NSObject

@property (nonatomic, assign) Class<MyFancyData> cls;
@end

来源：https://stackoverflow.com/questions/27760662/is-it-possible-to-define-a-property-with-class-type-that-conforms-to-protocol