“The reader should be able to read the message of a text easily and comfortably. This depends to a not inconsiderable extent on the size of the type, the length of the lines and the leading (line-height).”
- Josef Mueller–Brockmann
The Human Interface Guidelines are a set of design principles and guidelines for creating user interfaces that are easy to understand, use, and visually pleasing. The Apple OS software guidelines cover a wide range of topics, including layout, typography, colour, and navigation, and are intended to help developers create apps that are consistent with the overall look and feel of Apple OS platforms.
The guidelines are updated regularly to reflect changes in technology and user expectations, intended to help ensure that apps created for Apple's OS platforms are of high quality and provide a satisfactory user experience.