Adding a custom font to a bar button item - ios

Question

I am attempting to add custom font to a bar button item but I am getting this crash.
-[__NSPlaceholderDictionary initWithObjects:forKeys:count:]: attempt to insert nil object from objects[0]'
*** First throw call stack:
I'm pretty sure I have added the font correctly, it is in my info.plist and the custom font shows up in IB.
This is how I am setting the font:
NSDictionary *barButtonAppearanceDict = #{NSFontAttributeName : [UIFont fontWithName:#"OpenSans-Regular" size:12.0], NSForegroundColorAttributeName: [UIColor whiteColor]};
[[UIBarButtonItem appearance]setTitleTextAttributes:barButtonAppearanceDict forState:UIControlStateNormal];
Any ideas as to why I am getting this error?
This is how I am adding the font.

Answer 1

To add a custom font to your application, here is a useful guide:
http://codewithchris.com/common-mistakes-with-adding-custom-fonts-to-your-ios-app/
You can use this tutorial to double-check your custom font.
Whatever the method you use to add a custom font, run the below code to check the name of the font as it is loaded in your app. It will list all the fonts that are available in your app.
for (NSString* family in [UIFont familyNames])
{
NSLog(#"%#", family);
for (NSString* name in [UIFont fontNamesForFamilyName: family])
{
NSLog(#" %#", name);
}
}
Then, you can get the name of the font in the system.
I don't know how you add your custom font, but in general, the Regular font is loaded without Regular suffix.
So, replace
NSDictionary *barButtonAppearanceDict = #{NSFontAttributeName : [UIFont fontWithName:#"OpenSans-Regular" size:12.0], NSForegroundColorAttributeName: [UIColor whiteColor]};
with
NSDictionary *barButtonAppearanceDict = #{NSFontAttributeName : [UIFont fontWithName:#"OpenSans" size:12.0], NSForegroundColorAttributeName: [UIColor whiteColor]};