Since Apple refuses to make things easier and switch to USB-C on their mobile devices, you'd need to grab one of these lightning to USB B cables, or a iPhone Camera Adapter, for your iOS devices in order use the BeatBox.

We wanted to make things easier for you, so here it is: our own Lightning to USB B cable! No need to ask around to make sure if these cables work for MIDI devices, we know they do, we've tested them.
 
Ships to the North American Region only.