以編程方式獲得核心數據對象的大小（字節）

Question

有沒有一種方法可以以編程方式獲得核心數據對象的大小（以字節爲單位）？

Answer 1

在此，存在SO線程轉換NSManagedObjectID into NSData

NSURL * url = [[YOUROBJECT objectID] URIRepresentation]; 
NSData * urlData = [NSKeyedArchiver archivedDataWithRootObject:url]; 
NSLog(@"Data Length :%d",[urlData length]); 

Answer 2

則可以使用下面的代碼計算各個NSManagedObject

- (void) calculateSize { 

    NSFetchRequest *request = [[NSFetchRequest alloc] initWithEntityName:@"Event"]; 

    NSArray *data = [self.managedObjectContext executeFetchRequest:request error:nil]; 

    NSLog(@"Size of %@: %zd", NSStringFromClass([data class]), malloc_size((__bridge const void *) data)); 


    int totalSize = 0; 
    for(NSManagedObject *object in data) 
    { 
     totalSize += malloc_size((__bridge const void *) object); 
    } 
    NSLog(@"Managed Object Size total:%d", totalSize); 
}