问题
I have a custom class Thing:NSManagedObject with an attribute of adminName.
I am trying to create a copyWithZone function in this Thing class, but when I run the app it says setAdminName doesn't exist.
In my implementation file I am using
@dynamic adminName;
-(id) copyWithZone: (NSZone *) zone
{
Thing *regCopy = [[Thing allocWithZone: zone] init];
regCopy.attendeeNum = [self adminName];
return regCopy;
}
I don't believe I can just change @dynamic to @synthesize since I am using Core Data.
回答1:
NSManagedObject does not conform to the NSCopying protocol. If you want to create a new record with the same data, just insert a new object and assign the values from the first object to the second object.
回答2:
You will need to create a new Thing the same way you created the original Thing something like
Thing *regCopy = [NSEntityDescription insertNewObjectForEntityForName:@"Thing" inManagedObjectContext:self.managedObjectContext]
来源：https://stackoverflow.com/questions/11974701/nsmanagedobject-copywithzone-issues