Uploading scores with GameKit

How do I save and upload scores later if there is no connection available? In a WWDC session it says to use the following code if no connection is available:

NSData *archivedScore = [NSKeyedArchiver archivedDataWithRootObject:[NSData dataWithBytes:&score length:sizeof(score)]];

开发者_运维技巧

I then save the NSData object to NSUSerDefaults. But how do I get an int score value back from that to report?

Thanks

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Use NSKeyedUnarchiver (from Archives and Serializations Programming Guide)

int score = 42;
NSData *archivedScore = [NSKeyedArchiver archivedDataWithRootObject:[NSData dataWithBytes:&score length:sizeof(score)]];
int *scorePtr = [[NSKeyedUnarchiver unarchiveObjectWithData:archivedScore] bytes];
NSLog(@"score = %d", *scorePtr); // Output: score = 42