A San Francisco? Is a native bitmap font published in 1984 on Macintosh computers. It was designed by Susan Kare (English: Susan Kare) and imitated the font of ransom note (English: Ransom note effect), which was used in early Mac software demonstrations and Apple flyers.
Later, only the user interface of Apple Watch adopted this font, and then macOS and iOS released on 20 15 also began to use San Francisco font.
Apple said that San Francisco fonts can better adapt to small screen devices.
Extended data:
San Francisco font series is used for small screen, which is more advanced than San Francisco display and ensures the effect of small screen display.
San Francisco is a dynamic font.
As the default font of the system, San Francisco font is dynamically optimized, and the system will automatically switch between two sub-font families of display and text with the change of font size, usually 20pt is a switched boundary size.
Apple official website-Font