如何调试iOS7 shadowOffset崩溃

Question

My app works fine on ios6. I made a copy and ran it on Xcode5 and it launches but a few seconds later it crashes with this error:

[UIDeviceRGBColor shadowOffset]: unrecognized selector sent to instance

I had some tableviewcontroller lines like this:

//[[UINavigationBar appearance] setShadowImage:[[UIImage alloc] init]];

but I commented them all out thinking they were the issue. What else could be causing the crash?

Answer 1

//do this to see if the selector exists replace dismissViewController... with your selector that you want to check
if ([self respondsToSelector:@selector(dismissViewControllerAnimated:completion:)])
        {[[self presentingViewController] dismissViewControllerAnimated:YES completion:nil];} //post-iOS6.0
else {[self dismissModalViewControllerAnimated:YES];} //pre-iOS6.0