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Moreover, a native Brightkite application could eliminate the tedious workflow involved in photo posting by offering built-in Camera functionality. Address Book was another SDK feature used in the initial App Store release of the Brightkite iPhone application. We decided to use Address Book to simplify inviting friends to the Brightkite service via email or SMS. Address Book integration also allows users to discover friends already using the service. We did have some special concerns about integrating Address Book, which will be discussed later in this chapter. With all of the rich capabilities afforded by the iPhone SDK, we anticipated the complexity of developing the Brightkite application. We also welcomed the challenge, because we understood that optimizing user experience was key to the application s success.

If the needs of all the features running at a given time are more than the machine has available, bad things happen You might drop frames in audio, video, or animation, or the system might protect itself by crashing your application On the iPhone, you have the additional worry that every clock cycle you use is draining the battery that much faster Obviously, the resources are there to be used, but remember that those resources belong to the user If you waste users resources, they may well decide to give their business, and their money, to your competitor The big picture is what makes performance such a hard problem The questions of what needs to be faster and how much faster it needs to be do not have absolute answers.

To enable Zoom: 1. 2. 3. 4. 5. Tap the Settings icon. Tap General. Tap Accessibility (near the bottom of the page). Tap Zoom. Set the switch next to Zoom to On.

Core Location is a framework included in the iPhone SDK that gives developers access to the device s current location. Before discussing how we used Core Location in Brightkite, it is worth discussing how a location fix may differ depending on what type of device is being used. An iPod Touch has only Wi-Fi network connectivity, so the device determines a location fix by querying a database of Wi-Fi access points, which are mapped to physical locations. I wouldn t want to drive around the world mapping Wi-Fi access points, but it has been done, and the database is impressively accurate. On the original iPhone, Wi-Fi can be supplemented with cellular telephone tower triangulation data. Triangulation is less precise than Wi-Fi, but it s adequate when Wi-Fi data is not available. A GPS radio integrated with the iPhone 3G lets Core Location provide a much more accurate location fix. Core Location is now widely used in thousands of iPhone applications. Typically, you might find the framework used in an applications such as an ATM finder, which offers a sorted list of ATMs with the closest location displayed at the top and the rest in descending order. Brightkite s use of location is a bit more sophisticated because the service revolves around a specific place, rather than geographical coordinates. To provide the precision expected by users, the correct place is displayed on the I am screen shown in the following illustration, which is the main tab used to perform check-ins or posts.

Like VoiceOver, Zoom uses the three-fingered gestures. Be sure to take note of them before you leave the screen.

A feature that sucks up half the CPU by itself is bad, but having five features sucking up a quarter of the CPU each is worse This scenario is not uncommon; in fact, it occurs during every application launch Every line of code you run before accepting the user s input is making the user wait You could blow your entire development cycle trying to make that code faster, but it will never be fast enough It s much more effective to remove as much code as possible from that space The idea is to load only the visible user interface (UI), start the event loop, and then load the data necessary to fill in the UI Everything else should be loaded lazily; that is, only as needed Laziness won t make the individual lines of code execute faster, but neither will it make them larger or harder to understand.

If the contrast and colors are difficult to see, you might want to turn on the White on Black setting. To change this setting: 1. 2. Get into the Accessibility screen in the Settings app, as shown previously. Set the White on Black switch to On.