Method and apparatus are disclosed for mobile device interface for trailer backup-assist. An example vehicle system includes a vehicle and a mobile device. The mobile device includes a touchscreen, a communication module, and a controller. The controller is to present, via the touchscreen, an interface for trailer backup-assist and detect a swipe when the interface is presented. The controller also is to instruct, via the communication module, the vehicle to move in a direction corresponding to the swipe and continue to instruct the vehicle to move in the direction while detecting a continuous orbital motion extending from the swipe.