I'm working on an app where you can send either a text, image or a contact over Multipeer Connectivity to another device. It will then save in the second device's Core Data.
What I do is send the data over as an NSDictionary and convert it back again. So I am left with an NSDictionary on the receiving device. How then, can I save the object for the key of @"objectData" to Core Data?
I'd like it to work with NSString, UIImage & ABPerson.
// Create a new object in the managed object context.
Received *receivedData = [NSEntityDescription insertNewObjectForEntityForName:@"Received" inManagedObjectContext:self.managedObjectContext];
// Assign the properties based on what was input in the textfields.
// Check what type it is
NSString *dataType = [dictionary objectForKey:@"type"];
receivedData.type = dataType;
// Determine what type of data was passed over...
if ([dataType isEqualToString:@"Photo"])
{
receivedData.object = UIImageJPEGRepresentation([dictionary
objectForKey:@"object"], 0.5f);
NSLog(@"A photo saved in core data");
}
else
{
//receivedData.object = [NSKeyedArchiver archivedDataWithRootObject:[dictionary objectForKey:@"object"]];
receivedData.object = [[dictionary objectForKey:@"object"] dataUsingEncoding:NSUTF8StringEncoding];
}
// Save the managed object context.
NSError *error = nil;
[self.managedObjectContext save:&error];
I don't particularly want to do the if, else if statements to determine how to convert it core data as it would then be repeated when I display the data. Hoe else can I do it? I am currently getting errors with the NSKeyedArchiver type which I am unsure why and hence it is commented out.
Any help would be much appreciated!
Try this link for understand how its work
You can get NSData for any object conforming to the NSCoding
(or NSSecureCoding
) protocol:
NSData *data=[NSKeyedArchiver archivedDataWithRootObject:yourObject];
this line creates an object from NSData
TestClass *objTest=[NSKeyedUnarchiver unarchiveObjectWithData:yourData];
UIImage
and NSString
conform to NSCoding
, but for ABPerson
you'll need to use the vCardRepresentation
which returns NSData
.
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