Can not save NSDictionary with NSUserDefaults!!

One of the reason is one of which is of type NSNull which is not a property list value. iterate over the keys of the dictionary I just produced so conveniently with dictionaryWithValuesForKeys and remove those of type NSNull




NSMutableDictionary* dict = [NSMutableDictionary dictionaryWithDictionary:currentNullValueDic];

 for( id key in [dict allKeys] )

  {

       if( [[dict valueForKey:key] isKindOfClass:[NSNull class]] )

          {

                          [dict setObject:@"" forKey:key];

          }

}

iPhone Development (Object C) Tip

1. How to create (access) AppDelegate object

             projectNameAppDelegate* sharedApplication = (projectNameAppDelegate *) 
                                                                                                     [[UIApplication sharedApplication] delegate];

             Using this Object you can access main Window also.
  

     2.   Scheduling to method  

            [NSTimer scheduledTimerWithTimeInterval:1.0f target:self

                                   selector:@selector(didFinishMainURL) userInfo:nil repeats:NO]; 

 
 

      3. Re-create frame parameter from existing frame

           

            UIImageView *imageView = [productRowData objectForKey:@"product_image"];

            CGRect rect = imageView.frame;

            rect.size.height = 80;

            rect.size.width = 75;

            imageView.frame = rect;

            imageView.tag = 0;    // tag our images for later use when we place them in serial fashion

            CGRect frame = imageView.frame;

            //frame.origin = CGPointMake(15, 3);

            frame.origin = CGPointMake(0, 0);

            imageView.frame = frame;