How to get monospaced numbers in UILabel on iOS 9

This is now available in UIFont since iOS 9:

+ (UIFont *)monospacedDigitSystemFontOfSize:(CGFloat)fontSize weight:(CGFloat)weight NS_AVAILABLE_IOS(9_0);

eg:

[UIFont monospacedDigitSystemFontOfSize:42.0 weight:UIFontWeightMedium];

or in Swift:

UIFont.monospacedDigitSystemFont(ofSize: 42.0, weight: UIFontWeightMedium)