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emember back in the mists at the dawn of time when we wrote accessor methods for our instance variables We wrote a lot of boilerplate code, creating both a -setBlah method to set the object s blah attribute (obviously) and a -blah method to retrieve it. If the attribute is an object, we needed to retain the new one and release the old one. There are utilities out there that will turn your class definition into method declarations and definitions that you can paste into your files. But still, writing accessor methods is a lot of mindnumbing work that can better be applied to doing the cool stuff that s unique to your program. In Objective-C 2.0, Apple introduced properties, a combination of new compiler directives and a new attribute accessor syntax. The new properties feature greatly reduces the amount of mindless code you have to write. Throughout this chapter, we ll be modifying 10.01 CarParts-Init to use properties. The final code for this chapter can be found in the 11.01 CarProperties project. Remember that Objective-C 2.0 features can only be used on Mac OS X 10.5 (Leopard) or later. Properties are used heavily in newer parts of Cocoa (especially the snazzy Core Animation features) and are also used a lot in iPhone development, so they re worth getting familiar with.

This method obtains an entity from the model, creates a new NSManagedObject based upon the entity, and inserts it in the current managed object context For instance, the following code from insertNewObject in Listing 17-5 creates a new AKCGroup from the AKCGroup entity used in this chapter s xcdatamodel file:

First off, we re going to convert one of the simpler classes, AllWeatherRadial, to use properties. To make the discussion a little more interesting, we ll add a couple of calls in main to change some values on the AllWeatherRadials we create. We re simulating someone buying four tires on sale from different stores, so all four have different handling characteristics. Here is main again, with the new lines in bold:

AKCGroup * newGroup = (AKCGroup *) [NSEntityDescription insertNewObjectForEntityForName: @"AKCGroup" inManagedObjectContext:selfmanagedObjectContext];

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It is important to understand how appraisers, business brokers, and investment bankers work differently, because if you do not, it may cost you a lot of money when you buy or sell a business

After inserting a new object, you can then set its properties, just as if it were a normal object The following code sets the newly created AKCGroup s name:

int main (int argc, const char * argv[]) { NSAutoreleasePool *pool; pool = [[NSAutoreleasePool alloc] init]; Car *car = [[Car alloc] init]; int i; for (i = 0; i < 4; i++) { AllWeatherRadial *tire; tire = [[AllWeatherRadial alloc] init]; [tire setRainHandling: 20 + i]; [tire setSnowHandling: 28 + i]; NSLog(@"the tire's handling is %.f %.f", [tire rainHandling], [tire snowHandling]); [car setTire: tire atIndex: i]; [tire release]; } Engine *engine = [[Slant6 alloc] init]; [car setEngine: engine]; [car print]; [car release]; [pool release]; return (0); } // main

newGroupname = @"A new group";

If you run the program now, you ll get this output, showing our newly changed tire handling values:

3 We would not use a risk-free discount rate just because the earn-out is already reduced to its expected value, since it is still an uncertain cash flow, subject to risk

An application s managed object context does not automatically save changes to a model s data You must manually save the context to persist changes For instance, when an application is suspended or terminates, you might want to check the context for changes and, if there were changes, save them

tire 0's handling is 20 28 tire 1's handling is 21 29 tire 2's handling is 22 30 tire 3's handling is 23 31 AllWeatherRadial: 34.0 / 20.0 AllWeatherRadial: 34.0 / 20.0 AllWeatherRadial: 34.0 / 20.0 AllWeatherRadial: 34.0 / 20.0 I am a slant-6. VROOOM!

if ([managedObjectContext hasChanges] && ![managedObjectContext save:&error])

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The context saves changes using its save method This method persists the context s changes to its associated persistent data store The method takes an error as a parameter and returns a Boolean indicating success or failure

/ / / /

You can also roll back all changes to a context using the rollback method This method removes everything from something called the undo stack and removes all insertions and deletions, and restores all context-managed objects to their original state

20.0 21.0 22.0 23.0

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