On iOS, there are various conventions that apps generally follow. On a list item you can swipe from right-to-left to bring up a Delete option. On a list of stuff you can tap at the top of the screen to scroll to the top. These are standard things in the iOS ecosystem.
A good parallel outside of iOS would be the pervasive use of right-click to bring up a context menu in Windows or the convention of having "--help" show help text in Linux.
On iOS, there are various conventions that apps generally follow. On a list item you can swipe from right-to-left to bring up a Delete option. On a list of stuff you can tap at the top of the screen to scroll to the top. These are standard things in the iOS ecosystem.
A good parallel outside of iOS would be the pervasive use of right-click to bring up a context menu in Windows or the convention of having "--help" show help text in Linux.