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Steven Peterson
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Former life as a developer: One of the early developers of Yahoo s YUI user interface library, responsible for architecting several JavaScript components in YUI s first open source release. Also worked as a web applications developer using PHP, J2EE, and .NET for MetLife, Tommy Hilfiger, and IMVU. Life as an iPhone developer: Routesy is featured in the App Store s Navigation category and was one of the first 500 applications to appear on the App Store on its original launch date. Routesy was painstakingly crafted using beta versions of Xcode bundled with the iPhone SDK prereleases. What s in this chapter: This chapter discusses how to take an open XML data feed from the web and translate it into a hierarchical application that the user can navigate. It also covers how to take that data and put it into a locationsensitive context to help the user take advantage of the iPhone s geolocation capabilities. Key technologies Core Location Accessing web services Table views and table view controllers
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Going the Routesy Way with Core Location, XML, and SQLite
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hen I began writing Routesy, an application that allows San Francisco commuters to find out when the next bus will arrive, the dream of becoming a published iPhone software developer was the last thing on my mind. By the time Apple announced the iPhone SDK, I had already integrated the iPhone into my daily routine and was no longer hauling around an iPod and a separate phone in my pocket. The SDK convinced me that the iPhone is a device with unlimited potential, and I was determined to find a way to make my iPhone even more useful. Long before I ever even imagined that I might be selling downloadable software in the App Store, I was trying to figure out how to efficiently make my phone help me find the nearest bus and tell me when it would arrive. My primary guiding principle while building Routesy was always no more complex than this mantra: build something I d want to use on a daily basis. Although I have real customers today, my first and most important goal was to build an application for myself. I recommend this approach to any new iPhone developer looking for something amazing to build. Solve a problem that you personally have, and do it well. Chances are that someone else has the same problem and will find your application useful.
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CHAPTER 7: Going the Routesy Way with Core Location, XML, and SQLite
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In this chapter, we ll build a transit application from the ground up, using the iPhone s network and location-sensing technologies to put the transit predictions into a context where users will be able to find the nearest station and the next train arrival.
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Starting from Scratch
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Routesy was my first attempt at Cocoa development, so the learning curve was steep. I had to begin writing code in an unfamiliar programming language with a completely foreign tool set. While I d like to say that I spent my first few weeks with the iPhone SDK building the foundation of the application I would eventually ship, the reality is quite different. I would describe it more as furiously clicking the Build button in Xcode after tweaking lines of code, just hoping to get my project to successfully compile. There were two main stumbling blocks that I had to overcome through spending time experimenting with the SDK and the Apple-provided examples: Objective-C: At first glance, the language looks far more complex than it actually is. The primary sticking point I encountered was the distinctive bracket-based syntax. In other C-based languages, such as Java, you might be used to calling a method by invoking a call using a dot notation such as myObject.doSomething(). Objective-C uses brackets to group together the calling object and the method: [myObject doSomething];. It may take you a while to get used to seeing so many brackets in your code, but rest assured that this notation actually makes it easier to read long, nested method calls. You don t have to master Objective-C before building your iPhone application, and you ll probably find that it s easy to learn as you go. Interface Builder: I initially found the concept of connecting outlets and actions in Interface Builder to the objects in my application to be a bit daunting. I found that the most helpful resources for understanding Interface Builder were the project templates included with Xcode. By providing several starter templates that you can use as the basis for your project, Apple gives you example applications with Interface Builder XIB files that already have connections set up in your code. The Apple example projects included with the SDK are also great resources for understanding how to effectively separate user interfaces from your code using Interface Builder.
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