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CHAPTER 5: Frameworks in Xcode
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Figure 5 5. Adding entities
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For the other relationship, choose the computer entity, click on the Add button in the middle panel and add a relationship called owners (notice the plural this is a convention for a To-Many relationship). Choose subscriber as the Destination entity and check the To-Many checkbox. You should see two arrows linking the entities. Now click on the Inverse popup and choose maincomputer as the inverse relationship. Now the arrows will collapse into one, with a single head pointing to the computer entity and a double head pointing to subscriber . Once you are done your model should look like Figure 5 6. If it doesn t, don t worry it s easy to miss something when you are doing this. Go carefully over Table 5 3.
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CHAPTER 5: Frameworks in Xcode
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Table 5 3. The Subscriber Entity, Attributes, and Data Types
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subscriber subscriber subscriber subscriber subscriber subscriber computer computer
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firstName lastName membershipNumber emailAddress subscriptionExpiryDate notes modelName modelID
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String String Integer16 String Date Binary data String String
Figure 5 6. The completed datamodel for the MUGsub application
CHAPTER 5: Frameworks in Xcode
The notes field is set as binary data so that you can use that field for rich text later on if we choose. Also, note that you cannot have spaces in entity or attribute names. Your datamodel is complete. Save and close the datamodel editor window. Now, you have the model for your application established the first part of the MVC triumvirate. Next, the view and controller. Back in the project workspace, double-click the MainMenu.xib entry to open up the NIB file. Open up the main user interface window if it is not already open and give it a title say, MUG Subscribers Database . There is one bit of forward planning that is worth doing here. You could choose to put each entity in its own window, but for a fairly simple system like this it seems like overkill. Instead, let s put a tabbed panel control into the window and use tabs for our entities. So, drag a Tab View object out of the Library. Click on the first tab button and give it the title Subscribers . Do likewise for the second button, calling it Computers . Now you can get on with populating the user interface with the data controls. Since you are using the Core Data framework, the otherwise complex business of connecting up the view and controller to the model has some nice shortcuts. Choose the Library window and find Core Data under the Objects & Controllers section (by the way, you can use a Spotlight-style search to quickly filter out the library item you are after: try typing Core into the search box at the bottom). Drag the Core Data Entity controller into the user interface window. This brings up the New Core Data Entity Interface Assistant. In this window, choose the only project and data model on offer. In a really complex development environment you may have several data models to choose from, but not for this example. In the next column, choose the subscriber entity, then click the Next button. In this window, you can choose how you want the data from that entity to be displayed. Choose Master/Detail View and select all three checkboxes. By selecting these options, you will see a main table view representing your entity, and as you choose each row in the table you will see the details for that record elsewhere in the window. The Add/Remove checkbox provides you with the buttons necessary to maintain database records. Choose the Next button again and you will be able to choose which attributes to display from this entity (see Figure 5 7 if your model has relationships, then you will be able to select those here, too). The available properties are all checked by default; leave them that way and choose Finish. You should now see your user interface populated with a range of controls In truth, the user interface is not very attractive at this stage: the ordering of controls is not logical; the control for your notes field is, for some reason, an Image View; and the whole layout is a little cramped. However, you can sort that out fairly easily. The important thing to note is that Interface Builder has created a complete user interface for your Core Data application, including making all of the necessary connections. Most of what you need to do to make this a complete working application is now done. Let s go ahead and check what is here and what needs to be sorted out.
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