iOS 7 Only App Crashes at Startup

Question

I recently changed my xcode project to be iOS 7 only instead of supporting iOS 5. After making this change as soon as the app starts I get this message in the console.

Answer 1

This problem arises due to giving different NSAttributedString.key and value to attributed String.

Error: let prefixAttribute = [ NSForegroundColorAttributeName: UIFont(name: "HelveticaNeue-Light", size: 11.0), NSFontAttributeName: UIColor.darkGray]

Solved: let prefixAttribute = [ NSFontAttributeName: UIFont(name: "HelveticaNeue-Light", size: 11.0), NSForegroundColorAttributeName: UIColor.darkGray]

I have interchanged colorarrtibute with font and vice versa

Answer 2

You probably did what I did, and overzealously cut and replaced the compiler warnings for UITextAttributeTextShadowColor and UITextAttributeTextShadowOffset. So you had code that looked like this:

NSDictionary *titleAttributes = @{UITextAttributeTextColor: [UIColor whiteColor],
                                  UITextAttributeTextShadowColor: [UIColor blackColor],
                                  UITextAttributeTextShadowOffset: [NSValue valueWithUIOffset:UIOffsetMake(1, 0)],
                                  UITextAttributeFont: [UIFont titleBolder]};
[[UINavigationBar appearance] setTitleTextAttributes:titleAttributes];

and replaced them both with NSShadowAttributeName, and ended up with some code like this:

NSDictionary *titleAttributes = @{NSForegroundColorAttributeName: [UIColor whiteColor],
                                  NSShadowAttributeName: [UIColor blackColor],
                                  NSShadowAttributeName: [NSValue valueWithUIOffset:UIOffsetMake(1, 0)],
                                  NSFontAttributeName: [UIFont titleBolder]};
[[UINavigationBar appearance] setTitleTextAttributes:titleAttributes];

What you need to do is have one attribute NSShadowAttributeName, and create an instance of NSShadow that contains the shadow color and shadow offset.

NSShadow *shadow = [[NSShadow alloc] init];
shadow.shadowColor = [UIColor blackColor];
shadow.shadowOffset = CGSizeMake(1, 0);
NSDictionary *titleAttributes = @{NSForegroundColorAttributeName: [UIColor whiteColor],
                                  NSShadowAttributeName: shadow,
                                  NSFontAttributeName: [UIFont titleBolder]};
[[UINavigationBar appearance] setTitleTextAttributes:titleAttributes];