StackOverflow2013

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copied!<p>You need to do the loading in the singleton itself what is going on here is you create the single, you assign an lval to the singleton, you then create a new object and reassign the lval to that new object WITHOUT modifying the singleton. In other words:</p> <pre><code>//Set venue to point to singleton Venue *venue = [Venue sharedVenue]; //Set venue2 to point to singleton Venue *venue2 = [Venue sharedVenue]; NSData *data = [[NSMutableData alloc] initWithContentsOfFile:[self dataFilePath]]; NSKeyedUnarchiver *unarchiver = [[NSKeyedUnarchiver alloc] initForReadingWithData:data]; //Set venue to unarchived object (does not change the singleton or venue2) venue = [unarchiver decodeObjectForKey:@"Venue"]; [unarchiver finishDecoding]; </code></pre> <p>What you want to do is deal with this in the sharedVenue. There are a couple of ways people do singletons, so I can't be sure what you are doing, but lets assume sharedVenue currently looks something like this:</p> <pre><code>static Venue *gSharedVenue = nil; - (Venue *) sharedVenue { if (!gSharedVenue) { gSharedVenue = [[Venue alloc] init]; } return gSharedVenue; } </code></pre> <p>Assuming that is the case you want to change it to load the object into the global backing the singleton:</p> <pre><code>static Venue *gSharedVenue = nil; - (Venue *) sharedVenue { if (!gSharedVenue) { NSData *data = [[NSMutableData alloc] initWithContentsOfFile:[self dataFilePath]]; NSKeyedUnarchiver *unarchiver = [[NSKeyedUnarchiver alloc] initForReadingWithData:data]; [data release]; gSharedVenue = [unarchiver decodeObjectForKey:@"Venue"]; [unarchiver finishDecoding]; [unarchiver release]; } if (!gSharedVenue) { gSharedVenue = [[Venue alloc] init]; } return gSharedVenue; } </code></pre> <p>Obviously you need to somehow convey the actual path to archived object file.</p> <p>EDIT BASED ON COMMENT:</p> <p>Okay, if you are using the alloc based singleton you need to deal with this in the classes init method:</p> <pre><code>- (id) init { self = [super init]; if (self) { NSData *data = [[NSMutableData alloc] initWithContentsOfFile:[self dataFilePath]]; NSKeyedUnarchiver *unarchiver = [[NSKeyedUnarchiver alloc] initForReadingWithData:data]; [data release]; Venue *storedVenue = [unarchiver decodeObjectForKey:@"Venue"]; [unarchiver finishDecoding]; [unarchiver release]; if (storeVenue) { [self release]; self = [storedVenue retain]; } } return self; } </code></pre>

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