Question

I am using the framework GKAchievementNotification (https://github.com/typeoneerror/GKAchievementNotification) in my iOS 4.1+ app. This app is approved by Apple (is on app store) but seems to crash on iOS 4.3.3. The crash log is the following:

OS Version:      iPhone OS 4.3.3 (8J3)
Report Version:  104

Exception Type:  EXC_BREAKPOINT (SIGTRAP)
Exception Codes: 0x00000001, 0xe7ffdefe
Crashed Thread:  0

Dyld Error Message:
  Symbol not found: _OBJC_CLASS_$_GKNotificationBanner
  Referenced from: /var/mobile/Applications/08289A0B-7AD3-4E37-B29F-A EDFE97B7ACA/PolarDefense.app/PolarDefense
  Expected in: /System/Library/Frameworks/GameKit.framework/GameKit
  in /var/mobile/Applications/08289A0B-7AD3-4E37-B29F-AEDFE97B7ACA/PolarDefense.app/PolarDefense
  Dyld Version: 191.3

Seems like the framework is not correctly discarding GKNotificationBanner for iOS versions which it does not support (iOS prior to 5.0).

I am assuming the error lies in the following code, what do you think it wrong?

@implementation GKAchievementHandler(private)
- (void)displayNotification:(GKAchievementNotification *)notification {
 #if __IPHONE_OS_VERSION_MAX_ALLOWED >= 50000
  if ([GKNotificationBanner class]) {
    [GKNotificationBanner showBannerWithTitle:notification.title 
                                      message:notification.message
                            completionHandler:^{
                                [self didHideAchievementNotification:notification];
                            }
     ];
  } else
 #endif
  {
    [_topView addSubview:notification];
    [notification animateIn];
  }
}
@end

GKNotificationBanner is referensed in a few more places but always surrounded by #if __IPHONE_OS_VERSION_MAX_ALLOWED >= 50000

So how come it crashes? (And why only in release mode?)

Deployment target is 4.1. I read now that the run-time checking of if a class exist is only supported in 4.2. Could this be the problem?

Answer 1

Think it could be related to me having a required linking to GameKit. Will change it to weak and submit it to App Store (for the third time).