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Because all of the information was visible at once, the screen didn t actually do anything. You could tap the Edit button at the top of the screen to update the information or tap the Trips button to return to the main screen, but the data section of the detail view was completely static. I noticed that users swiped up and down to see if there was any additional data. Swiping but not seeing motion was disorienting. They didn t necessarily expect more data, but they expected the screen to react to the touch. The solution to this was twofold. First, I allowed the screen to scroll up and down even if the data didn t run off the page. This change also served a practical purpose in that we allowed the Notes field to expand rather than truncate long notes, but the primary purpose was psychological. When users swipe, the application responds. Next, I implemented swipe navigation for the detail views. Instead of having to navigate back to the main view and select the next record, users can simply swipe to the left or right to reveal the next or previous record.

At this point, you really need to rely on your programming skills to determine where you can improve performance, and being able to read the assembly code will help you a lot. You really don t need to be an ARM assembly master because the ARM opcodes look pretty much like opcodes in any other architecture, so it s very easy to read. Just look for lines of source code that seem to be generating lots of load and store commands, and then think about whether there is any way that you could rewrite the function so that it won t need to do so many. Also, keep an eye out for unnecessary branches since branching is expensive and can stall the execution pipeline.

TIP: After you sync these podcasts, you enjoy them in the Podcasts section of the Music app on your device.

Summary

After diligent study of Apple s UI conventions, internal iteration, and informal usability testing, you may think you re ready for release you re not. iPhone users have a very high expectation for the fit and finish of an application. It s something that s experienced over time, not just shown in screenshots. Users feel and react to subtle details when interacting with your application, so no detail of the UI should be left to chance. I literally spent weeks obsessing over the background image used in our applications. I started with the idea of a very distinct worn paper look, kind of like an old logbook that had spent a few hot summers in the glove box (see Figure 1-17).

When you click the iTunes U tab, you can choose to sync specific, recent, or unplayed iTunes U content, or all content. TIP: iTunes U podcasts are similar to other audio or video podcasts, except that they focus on educational content and are mostly produced by colleges and universities. Most are free to subscribe to in the iTunes store. When you subscribe and set up the auto sync as shown in this section, you ll receive all your favorite iTunes U podcasts on your iPod touch. Be sure to check out the iTunes U section in the iTunes store. You may find your favorite college or university has shows to teach you biology or astronomy, or a whole lot more. There s even a Stanford University course on how to develop iPod touch apps! Many of the top universities broadcast class lectures from famous professors in iTunes U. Go ahead and check it out what you ll find is amazing! To sync iTunes U content from your computer to your iPod touch, follow these steps. 1. Connect your iPod touch to your computer, start iTunes, and click your iPod touch in the left nav bar. Click the iTunes U tab on the top of the main window. Check the Sync iTunes U box (see Figure 3 19). If you d like to sync recent or unplayed items, check the Automatically include box and use the pull-down to select All, 1 newest, All unplayed, 5 newest, 10 most recent unplayed, etc.