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PONeed to add additional object using NSCoder encodeObject:/decodeObject
 

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    <p>So I have a project that uses the old-style encodeObject:/decodeObject NSCoder serialization. I need to add a new object to the serialization process but previously saved documents will crash as decodeObject tries to decode something that's not there (yet).</p> <pre><code>-(void) encodeWithCoder:(NSCoder *)aCoder { [super encodeWithCoder:aCoder]; [aCoder encodeObject:existingArray]; [aCoder encodeObject:anotherExistingArray]; [aCoder encodeObject:myNewArray]; } -(id) initWithCoder:(NSCoder *)aDecoder { self = [super initWithCoder:aDecoder]; if( self != nil ) { NSArray *_existingArray = [aDecoder decodeObject]; NSArray *_anotherExistingArray = [aDecoder decodeObject]; // We crash here, this object doesn't exist in documents saved with only the first two arrays NSArray *_myNewArray = [aDecoder decodeObject]; } return( self ); } </code></pre> <p>I don't think I can convert this to a keyed archive and maintain compatibility with previously saved archives (which is a requirement). Trying to catch the exception that's thrown doesn't seem to help either.</p> <p>Any ideas?</p> <p><strong>UPDATE</strong>: Bah, why is it when you ask a question you almost immediately find the answer yourself?</p> <p>This class was versioned correctly. Previous author had a bug in the version check. So for completeness:</p> <pre><code>+ (void) initialize { if( self == [MyClass class] ) { [self setVersion:2]; // was 1 } } -(void) encodeWithCoder:(NSCoder *)aCoder { [super encodeWithCoder:aCoder]; [aCoder encodeObject:existingArray]; [aCoder encodeObject:anotherExistingArray]; [aCoder encodeObject:myNewArray]; } -(id) initWithCoder:(NSCoder *)aDecoder { self = [super initWithCoder:aDecoder]; int version = [aDecoder versionForClassName:@"MyClass"]; if( self != nil ) { NSArray *_existingArray = [aDecoder decodeObject]; NSArray *_anotherExistingArray = [aDecoder decodeObject]; if( version &gt; 1 ) { NSArray *_myNewArray = [aDecoder decodeObject]; } } return( self ); } </code></pre>
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