For iOS 15.0 or later/MacOS Monterey or later, you want to look at TextKit 2. See https://developer.apple.com/documentation/appkit/textkit/using_textkit_2_to_in

For iOS 15.0 or later/MacOS Monterey or later, you want to look at TextKit 2. See https://developer.apple.com/documentation/appkit/textkit/using_textkit_2_to_interact_with_text https://developer.apple.com/documentation/appkit/textkit/usi... That’s a new layout engine that currently is the default for text fields and on iOS and MacOS, but likely will be the only option some time in the future.