What Would Numbers Specified in UIButton Typography Mean?

Question

I see someone specified a typography of "Helvetica Neue, 65 Medium, 30pt" to be used for a UIButton.

I see other things like:

• "Helvetica Neue 45 Light"
• "Helvetica Neue 55 Roman"
• "Helvetica Neue 65 Medium"
• "Helvetica Neue 75 Bold"

What are the 45, 55, 65, 75?

This is for iOS 7; The HIG aka Human Interface Guidelines "Color and Typography" section was reviewed: https://developer.apple.com/library/iOS/documentation/UserExperience/Conceptual/MobileHIG/index.html

Answer 1

They correspond to the particular font weight of that font set. 45 corresponds to Light, whereas 75 corresponds to Bold. You shouldn't worry yourself with them.

In response to your comment: In Interface Builder, the numbers are a bit different - they correspond to the font size.