I want to be able to take a picture on snapchat where I can use assistive touch or a gesture to click the capture button for me so that I can be in the picture.
Welcome to iMore! You can take a screenshot in Assistive Touch, but not a selfie. I don't know of a way to do that. Not sure, exactly, what you're trying to do. I don't use Snapchat. I know you can't take a screenshot in Snapchat and hide it. Even if taken using Assistive Touch.