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CHAPTER 7: Smart In-Application E-mail with Core Data and Three20
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Understanding the Core Data Stack
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Let s chat a few about the relevant Core Data stack objects here including the managed object model (MOM), managed object context (MOC), and the persistent store coordinator. Although one chapter, let alone a few paragraphs, cannot explore all of Core Data, I plan on taking you on a quick tour of the technology to help you understand what exactly Core Data is and how you can use it. There s an abundance of information on the Internet, including the ADC, which covers Core Data in detail. If you re interested in learning more about the topic after you ve read this chapter, I highly recommend searching for Bill Dudney s and Marcus Zarra s work on Core Data. Both of these developers are highly regarded in the Mac and iPhone communities. I ve had the pleasure of learning how to write my first iPhone application sitting in Bill Dudney s class over at Pragmatic Studios. Ultimately these objects work in a hierarchy that is responsible for retrieving data from persistent storage, modifying the data, ensuring integrity, and finally presenting it to the application in a requested context. Core Data also gives the fascinating capability of working very aggressively to cache objects whenever it can. This works really well when you re working with a large data set. Regarding the persistent storage, Core Data is capable of using a SQLite back end, memory, or binary. For our purposes, we ll use a SQLite back end, which is evident in the persistentStorageCoordinator accessor method. The persistentStorageCoordinator speaks to a persistent object store underneath the hood. Don t worry about the persistent object store, though, because you won t be accessing it directly here. The persistent storage coordinator will take care of that for you. All you have to know is that the persistent storage coordinator communicates with the managed object model to help you understand what the data looks like that it is asked to delegate to the persistent object store (POS). The MOM contains information to your model classes, which I ll cover shortly. The object you will interact with mostly is the MOC. You ask the MOC to grab your model objects for you. You manipulate your objects through it including insertions and deletions. You also eventually ask the managed object context to save your data. Once that happens, the managed object context shoots all the information it needs to down the stack that composes Core Data. Reference the previous code to see how that stack is built and communicates with each other. I can t express how condensed the overview of Core Data is here. It doesn t do this framework justice. There are books written on the topic alone, so make sure you do your Googling if you want to learn more.
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While I m here, you should also go ahead and get your project set up with the Three20 library in addition to the SystemConfiguration framework. Joe Hewitt has posted awesome instructions on how to add Three20 to a project. You will need to have Git available (downloadable from http://code.google.com/p/
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CHAPTER 7: Smart In-Application E-mail with Core Data and Three20
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git-osx-installer/) if you want to clone the Three20 repo. You re also more than welcome to just follow along in the code I ve already provided. Here s what you need to do in order to install it in your own projects: 1. Clone the three20 Git repository: git clone git://github.com/joehewitt/three20.git. Make sure you store the repository in a permanent place because Xcode will need to reference the files every time you compile your project. Locate the Three20.xcodeproj file under three20/src. Drag Three20.xcodeproj, and drop it onto the root of your Xcode project s Groups & Files pane. A dialog box will appear. Make sure Copy items is deselected and that Reference Type is set to Relative to Project. Then click Add. Link the Three20 static library to your project. Click the Three20.xcodeproj item that has just been added to the sidebar. In the details pane, you will see a single item: libThree20.a. Select the check box on the far right of that item (Figure 7-6).
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Figure 7-6. libThree20.a is added as a target to your application. Take note of the check box that s enabled underneath the target symbol in the top right.
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Add Three20 as a dependency of your project, so Xcode compiles it whenever you compile your project. Expand the Targets section of the sidebar, and double-click your application s target. On the General tab, you will see a Direct Dependencies section. Click the + button, select Three20, and click Add Target (see Figure 7-7).
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