NSClassFromString issue

Question

Why NSClassFromString(@"Object") returns Object class?

When I try to ignore it using respondsToSelector: , i get

NSForwarding: warning: object 0x325ef24 of class 'Object' does not implement methodSignatureForSelector: -- trouble ahead

NSForwarding: warning: object 0x325ef24 of class 'Object' does not implement doesNotRecognizeSelector: -- abort

I can insert isEqualToString for skipping @"Object" string, but is it an issue or not?

Update:

"Object" is really a class. It have 5 possible selectors: initialize, retain, release, autorelease, class.

It can't be allocated.

What? There is no class called "Object" in the Objective-C world... — borrrden, Oct 03 '13 at 08:53
have you alloc that? Class* clazz = NSClassFromString(@"Object"); NSObject* obj = [[clazz alloc] init]; [obj respondsToSelector....] — zt9788, Oct 03 '13 at 09:18
There is a class called Object. It is very old and doesn't respond to many of NSObject's methods. You should not use it. — Greg Parker, Oct 03 '13 at 19:02
Thanks to Greg Parker. It's really a class. Can you make an aswer for voting? — AlKozin, Oct 04 '13 at 06:26

score 1 · Answer 1 · answered Dec 19 '13 at 02:00

1

For classes use instancesRespondToSelector:.

answered Dec 19 '13 at 02:00

Rivera

10,792
3
58
102

score -1 · Accepted Answer · answered Oct 03 '13 at 09:44

-1

If You read documentation You can see that respondsToSelector: is using only with objects. And NSClassFromString returns You calss instead of object. I assume to solve Your issue You need to create object of received class.

answered Oct 03 '13 at 09:44

HereTrix

1,315
7
13

[Read this](http://stackoverflow.com/questions/1135366/class-method-equivalent-of-respondstoselector) Documentation not describes all possible methods. – AlKozin Oct 04 '13 at 06:20

NSClassFromString issue

2 Answers2