I have a cocos2d iOS app. I have a CCSprite that I need to come up from the bottom of the screen every few seconds (like 2 or 3 seconds). How would I do this?
Read these tutorials (the beginner ones). Your question sounds like you're getting ahead of yourself. If you don't know how to move a sprite, or time things or do things in intervals, you shouldn't be asking how to do all three at the same time. Take a step back, get comfortable with the basics. If you have a specific issue you're having trouble with, post another question here and we can help.