从coredata中获取主键

Question

我需要获取所有对象的主键，怎么实现？

推荐的代码：

[NSManagedObject objectID].

Answer 1

访问和获取对象的最佳途径：

NSFetchRequest* request = [[NSFetchRequest alloc] init];
[request setEntity:entity];
[request setResultType:NSManagedObjectIDResultType];
[request setFetchBatchSize:20];

NSError* error = nil;
NSArray* items = [context executeFetchRequest:request error:&error];

for (NSManagedObjectID* objectID in items) {
    NSManagedObject* object = [context objectWithID:objectID];
    ...
}