Core Data Concurrency Debugging
By Ole Begemann More about me and contact info June 11, 2014 Last update: June 23, 2014 In iOS 8 and OS X Yosemite, Core Data gains the ability to detect and report violations of its concurrency model.1 I think this is a very valuable feature because accessing a managed object context from the wrong queue is a simple mistake to make and can be fatal if it causes your users’ data to get corrupted.2
A better NSManagedObjectContext.performAndWait
The DispatchQueue.sync method has this nice property that it automatically returns whatever value you return from the dispatched block. This allows you to write something like the following: let v = queue.sync { return ... // computation that has to be run on queue } This is much more elegant than having to declare an optional result variable before the call to sync, capturing and assigning to the
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