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Making Improvements
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The application works, but already it is plain that there are some clunky features. Let s see what we can do to improve these.
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Displaying the Full Name in One Field
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One of the clunky features is the way we are handling the Consultant name. In the Manage Consultants window we have two columns, holding the firstName and lastName properties. Since we are probably going to be editing these properties in the text fields rather than the table view, wouldn t it be nicer if we could show the full name in one column The other place we see this is in the Journal Entries window, where we chose to bind the Consultant popup to the firstName property. Let s make that work better. To do this we are going to write some code, create a new managed object, and modify the bindings. Make sure your NIB is saved, and move to Xcode. In the Detail panel select the data model, and select the Consultant entity. Now choose File New File..., and the template chooser will appear. Since you had your data model selected you now have a new option available: Managed Object Class. This allows you to build Core Data entities from scratch. Choose this now. In the next window just choose Next. You will see a list of the entities in your project: select Consultant (actually, it should already be selected if you selected it in the data model earlier). From the checkboxes below the list panel, select Generate accessors and Generate Obj-C 2.0 Properties. Click on Finish.
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CHAPTER 9: Developing an Application
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This has given you a new Managed Object class, which enables you to elaborate the Consultant entity to add your own customized methods and properties. You are going to create a new property to put together a full name from the firstName and lastName properties. Listing 9 2 shows consultant.h with the new property (in bold) that you need to add.
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Listing 9 2. The New Header File for the Consultant Entity #import <CoreData/CoreData.h> @interface consultant : } @property @property @property @property @property @property @property @property @end @interface consultant (CoreDataGeneratedAccessors) - (void)addEntriesForConsultantObject:(NSManagedObject *)value; - (void)removeEntriesForConsultantObject:(NSManagedObject *)value; - (void)addEntriesForConsultant:(NSSet *)value; - (void)removeEntriesForConsultant:(NSSet *)value; @end NSManagedObject {
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(nonatomic, retain) (nonatomic, retain) (nonatomic, retain) (nonatomic, retain) (nonatomic, retain) (nonatomic, retain) (nonatomic, retain) (readonly) NSString
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NSString * consultantOfficePhone; NSString * consultantFirstName; NSString * consultantStreetAddress; NSString * consultantLastName; NSString * consultantMobilePhone; NSNumber * consultantDayRate; NSSet* entriesForConsultant; *fullName;
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Take a moment to look over this header file. It contains property declarations for all of the attributes and the relationship defined for the Consultant entity in your data model. You have just added one to handle the read-only property fullName. Now implement the getter method in the counterpart file consultant.m (Listing 9 3):
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Listing 9 3. Implementing the fullName Getter Method #import "consultant.h" @implementation consultant @dynamic @dynamic @dynamic @dynamic @dynamic @dynamic @dynamic consultantOfficePhone; consultantFirstName; consultantStreetAddress; consultantLastName; consultantMobilePhone; consultantDayRate; entriesForConsultant;
- (NSString *)fullName { NSString *firstName = self.consultantFirstName; NSString *lastName = self.consultantLastName; if ((firstName) && (lastName)) { return [NSString stringWithFormat:@"%@ %@", firstName, lastName]; }
CHAPTER 9: Developing an Application
if (firstName) { return firstName; } if (lastName) { return lastName; } // we get to here if neither firstName nor lastName is set NSString *noName = @"No name"; return noName; } @end
This is just making sure that the method returns something: preferably the full name, but failing that, either firstName or lastName, and a fallback in case neither is set. Now that you have the new Managed Object and the method to create a full name, let s make the necessary changes in the user interface. Switch over to Interface Builder and select the Manage Consultants window. At the moment this window has a Table View with two columns. Recall that these two columns were bound to the ac Consultant array controller like this:
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