Using the fontWithSize API with San Francisco
The new San Francisco fonts in iOS 9 are optimized for the size it will be used at, by adjusting tracking and dynamically switching between SF Display and SF Text. It was noted in the WWDC session #804 developers should not use San Francisco by attempting to initialize a UIFont using fontWithName , for example: UIFont *originalFont = [UIFont systemFontOfSize:11]; UIFont *newFont = [UIFont fontWithName:originalFont.fontName size:44]; This is because the system cannot optimize the font for the new size when using the fontWithName API. Instead it was recommended to get the UIFontDescriptor from