Warning: file_get_contents(/data/phpspider/zhask/data//catemap/2/github/3.json): failed to open stream: No such file or directory in /data/phpspider/zhask/libs/function.php on line 167

Warning: Invalid argument supplied for foreach() in /data/phpspider/zhask/libs/tag.function.php on line 1116

Notice: Undefined index: in /data/phpspider/zhask/libs/function.php on line 180

Warning: array_chunk() expects parameter 1 to be array, null given in /data/phpspider/zhask/libs/function.php on line 181
Cocoa 是否可以存档临时NSManagedObjectID?_Cocoa_Serialization_Nsmanagedobject_Nsmanagedobjectcontext - Fatal编程技术网

Cocoa 是否可以存档临时NSManagedObjectID?

Cocoa 是否可以存档临时NSManagedObjectID?,cocoa,serialization,nsmanagedobject,nsmanagedobjectcontext,Cocoa,Serialization,Nsmanagedobject,Nsmanagedobjectcontext,对于永久的NSManagedObjectID,我知道您可以归档它们的URIRepresentation,稍后使用持久存储返回NSManagedObjectID NSURL *uriRep = [objectId URIRepresentation]; NSPersistentStoreCoordinator *psc = ... NSManagedObjectContext *context = ... NSManagedObjectID *myID = [psc managedObjectID

对于永久的
NSManagedObjectID
,我知道您可以归档它们的
URIRepresentation
,稍后使用持久存储返回
NSManagedObjectID

NSURL *uriRep = [objectId URIRepresentation];
NSPersistentStoreCoordinator *psc = ...
NSManagedObjectContext *context = ...
NSManagedObjectID *myID = [psc managedObjectIDForURIRepresentation:uriRep];
NSManagedObject *myObj = [context objectWithID:myID];
但是,如果ID是临时的怎么办?有没有一种方法可以将其转换为NSString或NSData,稍后再取回,绕过持久性存储,直接与上下文一起使用?这对于某些临时对象可能很有用