The first edition of Core Data by Marcus Zarra was the book I turned to when I wanted to learn Core Data. Whilst it is still a great book it was. Threading in today’s Core Data is radically different from its original In this talk from #Pragma Conference , Marcus Zarra presents the. Core Data in Swift. by Marcus S. Zarra. Publisher: Pragmatic Bookshelf. Release Date: June ISBN: View table of contents. Start reading.

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If you get this message when you are adding your server to a team to implement continuous integration using Xcode bots and OS X server:. Cord have seen persistence layers where they have 12, lines of code in one class because everything can go into a block.

If you are interested in why, then I suggest reading up on the subjects of global variables and singletons. It also adds a property for the privateContext and we make a copy of the callback block that gets passed in. Ramy Kfoury rated it liked it Aug 22, Taught at universities around the United States Spoken at nearly every Apple related tech conference around the world Provided workshops on persistence, Core Data and Networking at many conferences and large corporations in and around the United States.

They brought me in for three weeks because their main developer was going on vacation for three weeks, and they were shipping in two weeks. If debugging is that hard, why would we ever want to write code at the edge of our ability? That is such terrible advice.


Core Data in Swift [Book]

Open Preview See a Problem? Zrara threading rules were also unclear. Your user interface should talk to your persistent container subclass and ask for the data it needs. Core Data is not complicated Core Data is as complicated as you make it. If the UI is single threaded, then we should be accessing the UI from a single source of truth. Unfortunately, as has been demonstrated numerous times in the past, syncing is hard, very hard.

Say our data was changed to this:. Core Data Intermediate Swift. This has changed a bit in iOS 9, where they added a new feature to allow us to consume remote notifications. Therefore, we should have a context dedicated to the user and dedicated madcus giving them the truth. For my own purposes I have resisted this slippery slope as often as possible.

Should it be read-only? The old complaints about Core Data being difficult to use and having a tremendous amount of boilerplate code came from this era and this design.

Core Data Threading Demystified

Finally, we declare an internal method that will do the initialization of the Core Data stack. We use just one for the application.

Then this controller will tell the Application Delegate when the persistence layer is ready to be used with the expectation that the Application Delegate will then complete the user interface and start displaying data. It could be a red herring. More methods develop over time as the application matures. Aug 23, Dmitry rated it liked it. Please try again later. The reason for this is because data changes only go up, not down or sideways.


Featured News 5G dataa coming: Datq was like that too; the threading rules were unclear, with different answers from different people. This was problematic hen we wanted to let one context know that we made a change in another context, probably on another thread.

Very little thought or structure is required. Return to Academy Transcript. So, on this line:.

Aug 14, Jose Lobato rated it liked it. The known issue when the user turns off iCloud is covered and a number of experienced developers are still reporting issues. I want to know your opinion about Realm and Core Data.

That is not its purpose.

My Core Data Stack

The user interface is our truth. For some reason there is a misconception going around that everything belongs in the view controller. This design mrcus us to have asynchronous saves, which is extremely important. I was incredibly disappointed in Swift when I started to look into how key value coding might be preserved in the transition from Objective-C.

There was an error submitting your subscription. Be clever or lazy and you are only punishing yourself and your users. The last three chapters of the book are somewhat bonus material.

That is the area of using Core Data in a multi-threaded environment. Zarra The Pragmatic Bookshelf, January has recently received a major update. Get more development news like this.