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Often, developers will update their apps for the iPod touch. You don t need to use your computer to perform the update you can do it right on your iPod touch. You can even tell if you have updates, and how many, by looking at the App Store icon. The one shown here has five app updates available for you to download. Once you enter the App Store, tap the right-most icon on the bottom row. This is the Updates icon.

Next, open EAGLView.m in the Classes folder and find the drawView function. While the name drawView was accurate for the template application, I suggest renaming it to updateView, to reflect what it actually does. For simplicity, I ll continue to refer to it as drawView. Remove everything from the drawView function except the context and bind calls, inserting a call to GameLoopFrame.

There is no built-in concept of holding a touch on a particular point Again, this solution worked fine in the simulator where you have to release the mouse before touching another location But things were not so clean on a device with real multitouch capabilities Then, it dawned on me that I could simply use two large, hidden buttons one covering the right side of the screen and one covering the left When the left button is pressed, the man runs left; the right button makes him run to the right This proved to be a whole lot simpler than trying to track touches, and it worked perfectly the first time around The moral of that story is to avoid getting fancy when you have a ready-made solution At this point, all the elements of the game were in place, but it still lacked something.

If you have apps with updates available, there will be a small number indicated in red. This number corresponds to the number of apps with updates. When you touch the Update button, the iPod touch shows you which apps have updates.

Instead of outright deleting everything in drawView, you may want to move the OpenGL ES code to the GameLoopFrame function in game.c. Be sure you re including the OpenGL ES headers at the top of the file.

To get your updates, you could touch an individual app. However, it is easier to touch the Update All button in the upper-right corner to have all your apps updated at once. The iPod touch will leave the App Store program, and you can see the progress of the updates in little status bars. All apps updating will have icons that look grayed out. Some status messages will show Waiting, while others will show Loading or Installing. When the update is complete, all your icons will return to their normal colors.

Touching the screen to move this way or that left me feeling kind of flat I was just about to release it anyway when I had a startling realization (or at least a startling recollection) that the iPhone has an accelerometer It was exactly what the game needed Tilting the device to the left or the right to make the stick man run that way gave the game a physical reality; you felt like there really was a little guy in there that you were influencing Using the accelerometer draws you into the game in a way that simply touching the screen does not Remember that the user interface is how the user interacts with your application it s not just screen layout of controls Thus your control scheme, even if it is not visible, is a huge part of the UI.

When you finish, the function should look like Listing 6-5.

NOTE: You will need to relaunch the App Store program to get back in. The update process takes you completely out of the store.

Accessing the accelerometer is pretty easy but requires a few specific steps First, we need to tell the compiler that the view controller wants to implement the UIAccelerometerDelegate protocol This is done in the header file, by adding the name of the protocol in angle brackets:.