AdMob crashes with [GADObjectPrivate changeState:]: unrecognized selector

Question

I have installed the AdMob SDK 6.2.0 (Xcode 4.5 (4G182) and I am testing on an iPhone 4S and the simulator). I followed the tutorial and just want to get AdMob showing a banner once. But it crashes on the last line:

self.bannerView = [[GADBannerView alloc]
               initWithFrame:CGRectMake(0.0,
                                        self.view.frame.size.height -
                                        GAD_SIZE_320x50.height,
                                        GAD_SIZE_320x50.width,
                                        GAD_SIZE_320x50.height)];

self.bannerView.delegate = self;
self.bannerView.adUnitID = @"xREMOVEDBYMEx";
self.bannerView.rootViewController = self;
[self.view addSubview:self.bannerView];
GADRequest * request = [GADRequest request];
request.testing = YES;
[self.bannerView loadRequest:request];

The crash is

2012-09-28 09:03:58.268 NewProject[1467:c07] -[GADObjectPrivate changeState:]: unrecognized selector sent to instance 0x95c17d0 2012-09-28 09:03:58.276 NewProject[1467:c07] * Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[GADObjectPrivate changeState:]: unrecognized selector sent to instance 0x95c17d0'

This looks like a bug in the library to me but I think thats very unlikely. Any thoughts?

EDIT: The exact same code works in the example projects. Is there something I can do wrong with my project file that would result in that error?

score 171 · Accepted Answer · edited Dec 27 '12 at 22:17

171

You need to add -ObjC to the Other Linker Flags of your application target's build setting:

Click the blue top-level project icon in XCode
Choose your target and go to Build Settings
Under Other Linker Flags add -ObjC for both Release and Debug

Source: https://developers.google.com/mobile-ads-sdk/docs/admob/mediation#ios-linker

Also be sure to do a clean and rebuild

edited Dec 27 '12 at 22:17

Community

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answered Sep 28 '12 at 11:19

bart

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my project won't compile with -all_load flag, but it seems to work without crash now after added -ObjC. Could you explain this? – Kent Nguyen Sep 29 '12 at 11:19
@bart: As a small christmas present I've updated this answer to contain the necessary information from the link and undeleted it. The next time please do it on your own though. – ThiefMaster Dec 23 '12 at 23:56
Why is it necessary to do so? – Martin Reichl Jan 15 '13 at 18:41
cocos2d projects seem to start with this flag. – OMGPOP Jun 30 '13 at 14:26
My God, project worked without this flag for years. And suddenly started to crash. WHY??? Why do I need this flag??? Any explanation? – Valeriy Van Jul 05 '13 at 12:31
I tried this in my project but it didn't work. My app still crashes. Any idea? – Manthan Jul 19 '13 at 13:01
It's not a solutions if u use Deployment iOS target 6 and more. It's will crash on compiling with facebook framework. – Dmitry Nelepov Aug 30 '13 at 17:34
FYI Does not work for iOS 10 and above on Xcode 8 as far as I know. My project already has that flag and I installed Firebase and Admob through Cocoapods, still get error. – Hedylove Sep 28 '16 at 05:20
Ignore that comment. ^ my error was that the UIView object was not set to the GAD class. – Hedylove Sep 30 '16 at 05:05

score 4 · Answer 2 · answered Aug 30 '13 at 18:01

4

Best solution for me is use -force_load flag instead -ObjC enter image description here

answered Aug 30 '13 at 18:01

Dmitry Nelepov

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With the "-ObjC" flag I was having problems with ASIHTTP. The best solution is use the flag above "-force_load". Tks! ;P – diegodsp Oct 03 '13 at 12:03
this will fully load only this library and reduce App size too, thumbs up – Mahmoud Fayez Mar 18 '14 at 22:53
Does not work on Xcode 8. Taking off -ObjC gives a linker error code 1. – Hedylove Sep 28 '16 at 05:26

score 3 · Answer 3 · answered Aug 14 '13 at 22:03

3

If you guys are still having trouble, make sure it's -ObjC and not -Objc. Geez, spent weeks trying to figure out why.

answered Aug 14 '13 at 22:03

ninjaneer

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Almost everything is case sensitive in most programming language. – GeneCode May 05 '14 at 09:09

score 0 · Answer 4 · answered Nov 22 '16 at 01:44

For those of you who tried adding the Obj-c linker flag and still got the same "unrecognized selector sent to instance" error when trying to load an ad I found a fix. This is for the newest XCode (version 8.1).

For reference:

I added Google AdMob using cocoapods.
I used storyboard to make an outlet connection to my viewcontroller and GADBannerView was NOT available as a class so I wrote it in like most people did.
On one of the stackoverflow answers that I saw the custom class for the bannerview was set to GADBannerView, which I assume would happen automatically if it was an option in the dropdown list when you added the outlet. For me it wasn't since I had to type it in myself.

Looking at the dropdown I saw that GADBannerView was available as an option and selected it.

After selecting it, the app ran without a hitch, no need to add the linker flag (mine was blank by default) or anything.

Hope this helps someone else!

AdMob crashes with [GADObjectPrivate changeState:]: unrecognized selector

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