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During the implementation process, I am able to talk to the programmers and understand and diagnose issues they run into Much of what we consider design lies in programming the flow and interactions of a web site or application As an interactive designer, my job truly begins when I finish a Photoshop document This is never truer than when designing for the iPhone Exactly how comfortable am I with the concepts of programming Before I developed Snow Reports, I knew a lot about variables, loops, functions, and if statements I knew nothing about objects, classes, controllers, views, threads, or anything else in between Memory management You might have well just asked me how to walk to the moon, as all of this was well above my head, and it looked like I needed to know a lot about all of it to make this application a reality.

7 percent of each run loop to 538 percent, as shown in Figure 7-9 That s a definite improvement, but I m still spending half the run loop drawing the same image If I can t draw it faster, maybe I can draw it fewer times, as I ll demonstrate in the next section Don t be surprised if an optimization actually makes things slower Figuring out why, aside from being instructional, can often uncover subtle bugs in the original code Getting there requires finding a metric to give Shark s results meaning in this case, the number of times the slow method gets called You can get this metric in a number of ways Apple s Instruments tool could do it, as could the Dtrace profiling technology on which that tool is built Setting breakpoints in the debugger that count, log, and continue would also work.

Every iPod touch is associated with an iTunes account. That association allows you to purchase iTunes music, videos, and apps from your iPod touch. It is also this association that allows you to play music from your iTunes account on your computer on your iPod touch. Sometimes, your iPod touch might lose its registration and connection with the iTunes account. Usually, this is a very simple fix. Just connect your iPod touch to the computer via the USB cable, and the iTunes app will walk you through the process of reassociating your iPod touch with your iTunes account. We show the detailed steps for how to do this in 1: Getting Started. If you have trouble registering your iPod touch through iTunes, then Apple provides an online resource that you can get to from your computer or iPod touch web browser. Type this into your web browser: https://register.apple.com/cgi-bin/WebObjects/GlobaliReg.woa You should see a screen similar to the one shown in Figure 28 4. Follow these steps to reregister your iTunes account:

In a pinch, a couple of static integers and NSLog will work Be careful with logging, though, as too many calls to NSLog will become their own performance problem..

So why even bother.

Now, choose the category, product line, and product. In this case, we chose iPod touch category, iPod product line, and iPod touch. This moved us through Steps 2 4 at once (see Figure 28 6).

The underlying principle of finite resources explains why low-level implementations are often faster than their high-level counterparts. High-level frameworks must be reusable in a number of situations, which means they must be flexible. This flexibility draws from the same resource pool as everything else. Custom code eschews flexibility in favor of performance. That same lack of flexibility is why custom code is more prone to break. Normally, robustness is more important than performance, but when performance really matters, it s time to get specific. Custom drawing code is common because drawing is one of the most expensive operations you can perform. Almost any amount of math is justified to avoid unnecessary drawing. This particular implementation detail is unlikely to change anytime soon, so this is a good time to leverage application-specific knowledge.

Now you need to enter your iPod touch serial number and other information that describes how you will use the iPod touch.