removing text shadows off all bar button items

[nbransby]

You have this comment in UIBarButtonItem+FlatUI.h

// removes the text shadows off a single bar button item (sadly, this can't be easily done for all buttons simultaneously)

• (void) removeTitleShadow;

...but it is possible with...

[[UIBarButtonItem appearance] setTitleTextAttributes:@{ UITextAttributeTextShadowOffset : [NSValue valueWithUIOffset:UIOffsetMake(0, 0)]} forState:UIControlStateNormal];