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

Question

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;

score 2 · Answer 1 · answered Jan 03 '15 at 23:35

2

@property id<MyFancyData> myFancyDataClass;

answered Jan 03 '15 at 23:35

Darren

`myFancyDataClass` is object of class that conforms to MyFancyData. But I need an object of `Class` type. – user1561346 Jan 03 '15 at 23:40
id basically means any class. So it will work. Or you can use Object – Darren Jan 03 '15 at 23:41

score 1 · Answer 2 · answered Jan 03 '15 at 23:34

1

Do you mean something like this?

@interface MyObject : NSObject

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

answered Jan 03 '15 at 23:34

No, I need a property of Class type. – user1561346 Jan 03 '15 at 23:36
It works, but it seems like it don't change anything. I still can set object of any class to this property. – user1561346 Jan 03 '15 at 23:48
You can set an object? That's a class property. – Jan 03 '15 at 23:51
I can set a Class that don't conforms to protocol specified in property definition. – user1561346 Jan 03 '15 at 23:54
I guess it won't get any better than this. – Jan 03 '15 at 23:55
@Andy: Feel free to post a solution. – Jan 04 '15 at 09:54
I've decided to use this approach for my needs: `- (id) getNewMyFancyDataObject;`. This way I'll get compile warnings if something wrong. – user1561346 Jan 04 '15 at 11:05

2 Answers2