Unfortunately, the iPhone/iPad is not really geared for use with flash. Beyond just an external physical connection, the internal hardware needs to be able to support it as well. In addition, full manual control over ISO, shutter speed, and aperture would be required, and that (to my knowledge) is not native to the Apple camera app.
While it is theoretically possible to do, the demand would probably be rather low (and cost, therefore, high), as (used) cameras with native ability to trigger flash can be had for about $100 with lens.
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