Question

I write an array of Contacts objects to file like this

[NSKeyedArchiver archiveRootObject:listOfContactsToLay toFile:[self fPath]];

Contact class implements the corresponding protocol,
but it has an UIImage field and it’s not gonna encode or decode throwing an encode exception. how should I write UIImage field?

Answer 1

Short solution

- (id)initWithCoder:(NSCoder *)decoder
{
    if ((self = [super init]))
    {
        NSData *data = [decoder decodeObjectForKey:@"UIImage"];
        self = [self initWithData:data];
    }

    return self;
}
- (void)encodeWithCoder:(NSCoder *)encoder
{
    NSData *data = UIImagePNGRepresentation(self);
    [encoder encodeObject:data forKey:@"UIImage"];
}
@end

source : http://iphonedevelopment.blogspot.com/2009/03/uiimage-and-nscoding.html