More iPhone 3 Development: Tackling iPhone SDK 3 (Beginning) by David Mark, Jeff LaMarche

By David Mark, Jeff LaMarche

I've been looking for a top quality iPhone improvement publication for newcomers. there are many books on iPhone improvement on hand, however it is especially tough to discover whatever for actual newbies. Obective-C isn't HTML and it takes actual attempt to appreciate iPhone improvement. subsequently, this publication has been a bit of necessary. It does construct steadily, introducing an increasing number of complicated projects and does an effective activity of explaining it alongside the way in which. the matter i discovered is that the various routines are spot on and paintings completely, whereas others fall flat and there's no existence boat. The discussion board linked to the booklet is energetic yet dated and responses spotty. i believe the matter here's that the velocity of improvement is so fast with the iPhone (iOS3 final yr, iOS4 this yr) that the authors are so busy writing the subsequent e-book that they do not have time to aid with the present variation and the editors aren't checking the code rigorously sufficient ahead of hitting the print button at the presses.

As readers we're apprehensive to consume solid fabric in an effort to study, however the bane of many software program books is that the code isn't really checked in addition to the grammar and we're left to paintings via it or hand over. this can be a good publication and worthy in lots of methods, yet there are a number of flaws that may journey you up. Apress should still pay a bit extra consciousness to ensuring all of the code works!

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Entities and the Data Model Editor Let’s go back to the data model editor and take a closer look at the simple data model that was provided as part of the template. xcdatamodel again. Your editor pane (the large pane at the bottom of the window) should look similar to the one shown earlier in Figure 2–4. Entities As we said before, the rounded rectangle in the center is an entity. In effect, an entity is like an Objective-C class declaration. Each data model class you would create if you didn’t use Core Data translates to an entity when you do use Core Data.

Key-Value Coding The NSDictionary class allows you to store objects in a data structure and retrieve an object using a unique key. Like the NSDictionary class, NSManagedObject supports the key-value methods valueForKey: and setValue:forKey: for setting and retrieving attribute values. It also has additional methods for working with relationships. You can, for example, retrieve an instance of NSMutableSet representing a specific relationship. Adding managed objects to this mutable set, or removing them will add or remove objects from the relationship it represents.

When your table view wants the number of sections for its table, it will call numberOfSectionsInTableView:. In our version, we get the section information by passing the appropriate message to fetchResultsController. m: - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView { CHAPTER 2: The Anatomy of Core Data return [[fetchedResultsController sections] count]; } The same strategy applies in tableView:numberOfRowsInSection: - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { id sectionInfo = [[fetchedResultsController sections] objectAtIndex:section]; return [sectionInfo numberOfObjects]; } You get the idea.

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