nsmanagedobject

问题 In Apple-generated code (Core Data NSManagedObject subclasses, for example) I see this: @objc(LPFile) public class LPFile: NSManagedObject { ... } My question is: why is the @objc declaration done as above, instead of: @objc public class LPFile: NSManagedObject { ... } or @objcMembers public class LPFile: NSManagedObject { ... } What is special about the separate @objc(identifier) declaration? I can't seem to find documentation about it and googling just turns up the other two approaches.

问题 In Apple-generated code (Core Data NSManagedObject subclasses, for example) I see this: @objc(LPFile) public class LPFile: NSManagedObject { ... } My question is: why is the @objc declaration done as above, instead of: @objc public class LPFile: NSManagedObject { ... } or @objcMembers public class LPFile: NSManagedObject { ... } What is special about the separate @objc(identifier) declaration? I can't seem to find documentation about it and googling just turns up the other two approaches.

问题 In Apple-generated code (Core Data NSManagedObject subclasses, for example) I see this: @objc(LPFile) public class LPFile: NSManagedObject { ... } My question is: why is the @objc declaration done as above, instead of: @objc public class LPFile: NSManagedObject { ... } or @objcMembers public class LPFile: NSManagedObject { ... } What is special about the separate @objc(identifier) declaration? I can't seem to find documentation about it and googling just turns up the other two approaches.

问题 While migrating an app from Realm to CoreData, I'm attempting to parse the following JSON structure: { "username": "972542052677", "displayName": "Arik", "countryCode": "972", "status": "Busy", "walletPublicKey": "XgWDiGMFRPDRVnRq8nxu7NyMLuT4Uez7mJ", "lastSeen": "2020-08-05T08:12:57.5267881", "isOnline": false } I need to create an NSManagedObject from this data so I'm following this tutorial: https://medium.com/@andrea.prearo/working-with-codable-and-core-data-83983e77198e This is the model.

问题 I am trying to use a custom class with swift and CoreData as a transformable object. I have been wasting hours trying to figure it out but cannot. I keep getting two errors: Property cannot be marked @NSManaged because its type cannot be represented in Objective-C and Property cannot be declared public because its type uses an internal type. Help is greatly appreciated. Thanks. I have a CoreData object named User. I also have an object named Site. I don't want the Site object to be a CoreData

问题 I am have an entity in core data and I try to update it from two different context. I am storing managedObjectID of my managed object which I need to update as it is thread safe. Before updating my object I refresh the object to avoid merge conflict. Here is my code: context1.performBlock { let myObject = context1.objectWithID(managedObjectId) context1.refreshObject(myObject, mergeChanges: true) myObject.property1 = newValue } Notice that I haven't saved the context here, as I want to commit

问题 I am occasionally seeing crashes with a stack trace like this: 0 libobjc.A.dylib 0x97dc0edb objc_msgSend + 27 1 com.apple.CoreData 0x97edcdc2 -[_PFManagedObjectReferenceQueue _queueForDealloc:] + 162 2 com.apple.CoreData 0x97edccbe -[NSManagedObject release] + 94 3 com.apple.CoreFoundation 0x9318ef38 CFRelease + 152 4 com.apple.CoreFoundation 0x931a7460 __CFBasicHashStandardCallback + 384 5 com.apple.CoreFoundation 0x931a706e __CFBasicHashDrain + 478 6 com.apple.CoreFoundation 0x9318f101

问题 My swift code saves 3 names to core data entity "username". I want to use uitextfield delegate to pull a specific string. So when the user enters 2 in the textfield. On the label labelName the name jessica Biel should appear. So the user enters a number into a textfield a string appears on the label. If number 1 is enter the 1st NSManagedObject into the core data entity userName. Link to project https://github.com/redrock34/jessicaBiel import UIKit import CoreData class ViewController:

问题 Hello everyone (sorry for my bad english, I'm French), I'm trying to put my NSManagedObject into NSUserDefaults to retrieve it with its relationships. Basically I used NSCoding and I had implemented the required method, but because it's NSManaged objects, the signature of the init method it's : init(entity: NSEntityDescription, insertIntoManagedObjectContext context: NSManagedObjectContext?). The message is "'NSInvalidArgumentException', reason: 'Illegal attempt to establish a relationship

问题 I am getting this error on generating an NSManagedObject in Xcode 8.1 in Swift. :0: error: filename "DemoOne+CoreDataClass.swift" used twice: '/Users/Swasidhant/Desktop/demo again/DemoOne+CoreDataClass.swift' and '/Users/Swasidhant/Library/Developer/Xcode/DerivedData/demo_again-hiinrbwwbmyfbrbctsfdzvudkkuy/Build/Intermediates/demo again.build/Debug-iphonesimulator/demo again.build/DerivedSources/CoreDataGenerated/Model/DemoOne+CoreDataClass.swift' :0: note: filenames are used to distinguish