Abstract: A method of operating an interface of a touchscreen with a single finger, adapted to perform a rotation operation on a frame displayed on a touchscreen of an electronic device, the electronic device comprising a detection unit and a control unit, the method comprising the steps of: touching the touchscreen for a predetermined time period, wherein the detection unit defines a touch position as an initial action point; displaying a rotation operation interface on the frame by the control unit; sliding the frame from the initial action point for a predetermined distance, wherein the detection unit defines the slided position as a start action point; and sliding the frame clockwise or counterclockwise about the initial action point, followed by rotating the frame clockwise or counterclockwise under the control of the control unit.

Abstract: A method of operating an interface of a touchscreen of a mobile device with a single finger is provided to zoom in or zoom out a picture on the touchscreen of the mobile device. The method includes: touching a left region or a right region on the touchscreen of the mobile device for a predetermined time; displaying a zoom-in or zoom-out operation interface on the touchscreen of the mobile device; and applying an upward stroke or downward stroke to the zoom-in or zoom-out operation interface to zoom in or zoom out the picture. Therefore, the method renders the operation interface intuitive and user-friendly and thus fit for use by the elderly and the disabled.