iOS 5 Core Frameworks: Develop and Design: Working with by Shawn Welch

By Shawn Welch

Apple has made it effortless to start constructing for iOS out of the field. To entry the real energy of iOS, although, you must transcend those uncomplicated instruments and APIs. skilled app developer Shawn Welch teaches you the way to faucet into the genuine capability of iOS through incorporating the most strong applied sciences it has to offer.

Using middle facts and iCloud, you are going to find out how to shop details in the community and sync seamlessly throughout a number of units and systems. Leverage iOS 5's new Twitter APIs, which offer painless Twitter and OAuth help utilizing the recent bills framework. Use position companies to include new iOS five positive factors, akin to opposite geolocation search for and sector notifications. contain wealthy media into  your apps utilizing snap shots, Animation, Audio, Video, and post-processing picture filters and research via middle photo. ultimately, discover Newsstand, which allows you to create your individual periodical content material and push new content material to units, even if the app isn't really running.

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But taking that one step further, I want you to come out on the other side of this book with an understanding of how these frameworks work, not just how to copy and paste code into your apps. iOS frameworks are remarkably consistent. Once you have a firm grasp of how one works, you’ll be able to transfer knowledge into how others work. Remember that iOS frameworks, specifically those new to iOS 5, are built from the ground up with multicore processors in mind. Because of this, many of your interactions with these new frameworks will be based on Grand Central Dispatch (GCD) and blocks.

If you modify properties of those objects, the object context will automatically keep a record of those changes. When you’re finished making changes, you simply call a save operation on the context and the context will push all of the changes back down through the coordinator and save the objects back to the persistent store. Additionally, as you’ll discover in the sections that follow, you can easily insert or delete objects to your persistent store by inserting and deleting objects in your managed object context.

Create a new request for our desired entity. We could also define additional parameters on the request such as a search predicate used to return only specific issues, and sort descriptors used to sort the returned objects (lines 5 and 6). 3. Execute the fetch request on our managed object context. This method will create new Issue objects based on our request and return them in an NSArray (line 12). 4. Iterate through returned objects. Notice that the fetch results array simply contains Issue objects.

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