I need help to convert photos in the .swf format to a format that will open on iOS

SWF is a Flash file that should be able to be opened with your web browser on your Mac. Probably not on iOS though.

You will likely need to find the source file for the application that created the SWF and the image will be in that. You could then export/extract the image and have it as a stand alone file.

It does look like there are applications that can do what you are looking for though: https://www.google.com/search?q=SWF+to+JPG