Author Archives: keith

I have to admit, I’m writing these things for purely selfish reasons. Same reason I write books. You learn WAY more by teaching. If you think you are getting some knowledge from reading these, realize that I am getting SO … Continue reading →

Robert Hodgin mentioned that he was getting some errors that cleared up when he added the Core Graphics Library to the project. I know some of the books mention doing this, but for some reason, that lib is always in … Continue reading →

See this note. Here in part three, we are going to do a few small improvements, and add in some gravity. Mid way through part two I realized that I had not set up a way for the ball’s color … Continue reading →

See this note. In part 1, we created a Ball class which contained position, velocity, radius, and a color. And we set up a timer to update the ball’s position based on its velocity and bounce off the walls. Now … Continue reading →

In order to not make this tutorial book length, I’m going to start with some assumptions. 1. That you have a Mac. 2. That you have XCode and the iPhone SDK installed. 3. That you have some familiarity with the … Continue reading →