My App crash on iPad before even application:didFinishLaunchingWithOptions:

Question

My app is crashing with the following crashlog when ran on ipad. It just work fine on iphone devices. As you might notice, it crash while trying to setup the window. I have searched everywhere but don't see such an issue in any other topic. Thanks for you help. ``` *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** setObjectForKey: object cannot be nil (key: NSParagraphStyle)' *** First throw call stack: ( 0 CoreFoundation 0x000000010e38ff35 __exceptionPreprocess + 165 1 libobjc.A.dylib 0x000000010e028bb7 objc_exception_throw + 45 2 CoreFoundation 0x000000010e296998 -[__NSDictionaryM setObject:forKey:] + 968 3 UIKit 0x000000010ca99d2d -[UILabel _setLineBreakMode:] + 529 4 UIKit 0x000000010cb7a572 -[UIButtonLabel setLineBreakMode:] + 93 5 UIKit 0x000000010cb86e5c -[UIButton _setupTitleViewRequestingLayout:] + 308 6 UIKit 0x000000010cb7ed15 -[UIButton titleLabel] + 51 7 UIKit 0x000000010cd3c6d8 -[UIZoomViewController loadView] + 476 8 UIKit 0x000000…

Accepted Answer

I was overriding those two functions in a category and guess what? those function seems to be called by ios even before you get control of the app in your AppDelegate. And for some reason on ipad this return nil. Removing the category fixed the problem.

```
+ (id)systemFontOfSize:(CGFloat)sz {
    return [UIFont fontWithName:@"HelveticaNeue-Regular" size:sz];
}
+ (id)boldSystemFontOfSize:(CGFloat)sz {
    return [UIFont fontWithName:@"HelveticaNeue-Bold" size:sz];
}
```

My App crash on iPad before even application:didFinishLaunchingWithOptions:

Solution

Problem