I am using UIKITFORMAC to develop apps for both iOS and mac OS in mac OS Beta 10.15.when I tried to develop menu views while right click with mouse,I found it seems there is no way to know left or right click.
I study https://developer.apple.com/design/human-interface-guidelines/ios/overview/ipad-apps-for-mac/ and UIGestureRecognizer in Developer Documentation, still confused...
https://developer.apple.com/design/human-interface-guidelines/ios/controls/context-menus/
https://developer.apple.com/documentation/uikit/uicontextmenuinteraction?language=objc
Right click is equal to: "To reveal a context menu, people can use the system-defined touch and hold gesture or 3D Touch (3D Touch can make context menus appear more quickly). When open, a context menu displays a preview of the item and lists the commands that act on it. People can choose a command or drag the item to another area, window, or app."
Left click is just a tap.
Right click is also a tap when debugging, so how to distinguish left or right click.😕