Making attributes for touch controls?

Okay so my game has a 1024x1024 scene size and I have camera control on my main character while he moves about. Now what I'm trying to do is make the lower left & right corners of my screen control his movement when I touch the screen. Now I know how to make buttons and have them control my movement but I need them to always be in the lower corners not just stay where I set them in the scene, if that makes any sense...
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