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Don t use stylesheets or other page inclusions that aren t required for your iPhone pages. Use Ajax when you can to reload parts of pages rather than whole new pages.
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Besides showing you how long files are taking to load, the Network Timeline might also remind you of files that you hadn t even realized were being loaded, and thus are slowing you down for no reason. Solving the energy problem is more difficult only because it s not an issue you usually have to think about when creating pages for desktop use. The top thing you need to watch is JavaScript. You don t want to include timeouts or event handlers that are constantly going to go out to the network or engage in other high-cost activities. Generally, you should think carefully before putting any sort of infinite loop on a page that s going to be viewed by an iPhone. It might be OK for an animation or some other client-side activity that will quietly shut off when the phone goes to sleep, but you should make sure you re polite about anything more than that. You don t want users avoiding your iPhone website because you drained their batteries. The general lesson for iPhone profiling is this: pay attention and write the sort of carefully considered code that you were probably thinking more about in the 1990s, before bandwidth and CPU became cheap.
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In all honesty, we don t have much for you SDK developers this time. Most of our discussion in this chapter was about web servers and clients, and clearly those are going to have little crossover with SDK development. The only point of particular relevance is the section on iPhone profiling. Thinking about energy consciousness is going to be even more important when we get into SDK development. There s a limit to how much damage a web programmer can do, because the iPhone ultimately controls access through the Safari interface. On the other hand, as an SDK programmer you re going to have access to a lot more fundamental code. Apple has done what it can to keep native programs from gobbling up an iPhone s battery, but you re going to need to do your part too.
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Over the past six chapters, we ve covered the libraries and tools that you can use to write iPhone web pages, but we ve also done our best to show standard iPhone architectures in the process. Generally, it all comes down to understanding the iPhone s key features. Knowing them and what they mean is as important to writing iPhone code as the actual features and functions we ve been discussing. An always-on internet is the thing that allows us to write web apps, and, as we ve just seen, power consciousness is an important consideration in profiling. The iPhone s
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unique input and output have been relevant to almost everything we ve talked about in writing web pages, while its orientation awareness has occasionally been both an issue and an opportunity. The iPhone s location awareness is the only topic we haven t been able to look at when thinking about web applications, because that information isn t available yet to the web developer. In this chapter, we re offered our best advice on how to make the web programming that you re doing easier. But the internet is a huge place increasingly full of great open source software and freeware. It s entirely possible that you ve already found tools that you like better than the ones we ve suggested. Now that we ve finished with our overview of the web, we invite you to take some time to get used to how the iPhone works in its web incarnation. Web programs will always remain among the easiest and most accessible programs that you can create for the iPhone, thanks to the simplicity of the web-based languages that have been developed over the last 15 years. As we discussed in chapter 2, even if you move on to the SDK, we believe that web programming will continue to have its place. But we also hope that you ll eventually be champing at the bit to do more: that you ll want to get into the guts of the iPhone and learn how to create native applications that can better utilize the iPhone s unique features and that can run with or without access to a network. For that reason, we invite you to move on to part 3 of this book, which explores the flip side of iPhone programming: the SDK. To help you get there, we ve written a special chapter intended to help bootstrap web developers into Objective-C coders; that s up next.
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