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You should use these standard controls to separate the presentation of your interface as appropriate for your application When considering how to create these dividing lines among all the tasks that your application is capable of and what should be visible at any one time, you must be mindful of focus once again Only display what is necessary for the task at hand on each screen associated with a navigation step or tab Strive to have only a single item as the focus of the screen, and reduce the number of UI elements present to the minimum needed to manipulate that item First, this strategy will help to ensure that the controls you present to the user are large enough to easily be targeted on the somewhat constrained real estate of the device More importantly, it will help to keep your interface simple and welcoming.

TIP: Suppose you meet someone at the bus stop someone you want to remember. Of course, you should enter your new friend s first and last names (if you know it), but you should also enter the words bus stop in the Company name field. Then when you type the letters bus or stop, you ll instantly find everyone you met at the bus stop, even if you can t remember their names!

eaglLayer.opaque = YES; eaglLayer.drawableProperties = [NSDictionary dictionaryWithObjectsAndKeys: [NSNumber numberWithBool:FALSE], kEAGLDrawablePropertyRetainedBacking, kEAGLColorFormatRGB565, kEAGLDrawablePropertyColorFormat, nil];

Below the home field are the fields for adding the address. Input the Street, City, State, and Zip Code. You can also specify the Country and whether this is a home or work address. When you are done, just touch the Done button in the upper right corner of the New Contact form.

Consider that none of Apple s stock iPhone applications ship with anything resembling a menu bar or a menu full of actions that can be taken at a single time (pickers are always reserved for selecting from data to use, not actions to take) Figure 7-6 shows two possible designs for a postcard application like Postage On the left, the different aspects of the postcard are captured as items in a table view The user could potentially work any the feature of the postcard by selecting that item from the table view and then drilling down to further details While using a table view is a very familiar concept for anyone that has experience with the iPhone, there is one glaring problem with this design.

If you are making a 3D game, then you will also need to allocate a z-buffer (depth buffer), but if you are developing a 2D sprite-based game, then odds are you don t need one, so you should not allocate one. An unnecessary z-buffer only uses up more RAM and potentially more pipeline bandwidth. For the best performance, your OpenGL context should be full-screen, 320 480, and have no other views or windows overlaying it. That means no iPhone status bar and no UIViews or controls of any sort. You should never apply any Core Animation transforms to your CAEAGLLayer object either. Doing that will cause your OpenGL view to become a nested subview of the animation layer, which means your game s frame rate will come to a screeching halt. Some developers get confused about how to make their game play in landscape orientation without using an animation transform to rotate the view. The solution to this problem is incredibly easy just rotate the OpenGL projection matrix by 90 degrees:

From the New Contact screen you ve been working in, just touch the Add Photo button next to the First Last tab. If you are changing a photo, when you are in edit contact mode, you ll see edit at the bottom of the existing photo. After you touch the add photo button, you ll see that you can Take a Photo Choose a Photo If there s a photo already in place, you can Edit a Photo Delete a Photo

glMatrixMode(GL_PROJECTION); glLoadIdentity(); glRotatef(-90, 0,0,1);