This warning is one of the quirks we have to deal with while the details of the Swift implementation are being ironed out. The warning occurs spuriously, i.e. your setup might work even if you do not follow the steps outlined below. I have been able to get rid of it in most cases by … Read more
From Predicate Programming Guide: You specify and test for equality of Boolean values as illustrated in the following examples: NSPredicate *newPredicate = [NSPredicate predicateWithFormat:@”anAttribute == %@”, [NSNumber numberWithBool:aBool]]; NSPredicate *testForTrue = [NSPredicate predicateWithFormat:@”anAttribute == YES”]; You can also check out the Predicate Format String Syntax.
You should probably save the master MOC in strides as well. No sense having that MOC wait until the end to save. It has its own thread, and it will help keep memory down as well. You wrote: Then at the end of the import process, I save on the master/parent context which, ostensibly, pushes … Read more
You should be looking at the same place you get NSLOGS And you should Go to Product -> Edit Scheme -> Then from the left panel select Run YOURAPP.app and go to the main panel’s Arguments Tab. There you can add an Argument Passed On Launch. You should add -com.apple.CoreData.SQLDebug 4 (number between 1 and … Read more
let request: NSFetchRequest<NSFetchRequestResult> = Level.fetchRequest() or let request: NSFetchRequest<Level> = Level.fetchRequest() depending which version you want. You have to specify the generic type because otherwise the method call is ambiguous. The first version is defined for NSManagedObject, the second version is generated automatically for every object using an extension, e.g: extension Level { @nonobjc class … Read more
I managed to locate the sqlite file, and its in this path now: Library/Developer/CoreSimulator/Devices/(numbers and letters)/data/Containers/Data/Application/(numbers and letters)/Documents/ (numbers and letters) stands for a folder that would be unique to your app/computer, but would look like this: 779AE2245-F8W2-57A9-8C6D-98643B1CF01A I was able to find it by going into appDelegate.m, scrolling down to the – (NSURL *)applicationDocumentsDirectory … Read more
You’ll have to create custom accessors if you want to restrict the values to an enum. So, first you’d declare an enum, like so: typedef enum { kPaymentFrequencyOneOff = 0, kPaymentFrequencyYearly = 1, kPaymentFrequencyMonthly = 2, kPaymentFrequencyWeekly = 3 } PaymentFrequency; Then, declare getters and setters for your property. It’s a bad idea to override … Read more
This is expected behaviour, core data won’t return full objects until you need to access the persistent values of the objects. Each of your returned objects will be a ‘fault’ until this point. You can force the fetch request to return full objects using [request setReturnsObjectsAsFaults:NO], but in most cases what you have will be … Read more
I personally use a reverse-DNS style domain. For example: NSError * myInternalError = [NSError errorWithDomain:@”com.davedelong.myproject” code:42 userInfo:someUserInfo]; The third part of the domain (@”myproject”) is just used to differentiate the errors from this project (“My Project”) from errors in another project (“My Other Project” => com.davedelong.myotherproject). It’s a simple way to ensure that I’m not … Read more
It’s like this: Core Data on its own, is completely local and does not automatically work with any of Apple’s cloud services. Core Data with iCloud enabled turns on syncing via iCloud. Any changes you save in Core Data are propagated to the cloud, and any changes made in the cloud are automatically downloaded. The … Read more