Support apparatus and electronic device employing support apparatus

An electronic device assembly comprising:

• an electronic device;
• and
• a support apparatus holding the electronic device and configured for supporting the electronic device on a supporting surface, the support apparatus comprising:
• a shell configured to receive the electronic device, the shell defining an elongated sliding rail;
• and
• a back-support comprising:
• a prop seat detachably engaged in the sliding rail and slidable in the sliding rail upon application of an external force;
• and
• a prop stand having one side rotatably engaged in the prop seat and serving as a spindle, and at least another side capable of being switched between a folded state in which the at least another side is substantially coplanar with the prop seat and a supporting state in which the at least another side is angled relative to the prop seat and serves as at least a supporting side, the switching executable by rotating the at least another side in unison with rotating the spindle in the prop seat;
• wherein when the at least another side of the prop stand is angled relative to the prop seat, a tilt angle of the electronic device on the supporting surface is adjustable by sliding the prop seat in the sliding rail.