MFMailComposeViewController throws an error only in iOS 9

Question

I can\'t get MFMailComposeViewController to open without throwing a fatal error in iOS 9 Simulator.

The same code (Objective C) works flawlessly in iOS 8.x and lower

Answer 1

I have no idea why it happens or how did I discovered it, the crash seems to be generated by setting the NSFontAttributeName in the Appearance proxy for the navigation bar, if I uncomment that line the app crashes.

    NSDictionary* format = @{
                         NSForegroundColorAttributeName:[UIColor whiteColor],
                         //NSFontAttributeName: [UIFont boldSystemFontOfSize:20],
                         };

[[UINavigationBar appearance] setTitleTextAttributes:format];

Please @Sleiman try and see if this fixes the issue for you too.