iOS (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;

      4. When you debug the code, use this code directly to display 'Method Name'

            NSLog(@"%s", __FUNCTION__);

      5. When get value from NSDictionary, use safe method

                int dlpInt = (([rowData valueForKey:@"DLP"] == [NSNull null]) ? 0 : [[rowData valueForKey:@"DLP"] intValue]);

                NSString *dateString = (([rowData valueForKey:@"DATE"] == [NSNull null]) ? @"" : [rowData valueForKey:@"DATE"]);

     6. When implementing delegate

        if ([_delegate

                respondsToSelector:

                @selector(onScoresSubmitted:)]) {

            [_delegate onScoresSubmitted:success];

        }

    7. Xcode general directory key word

•  "$(SRCROOT)" - Project directory
• "$CONFIGURATION_BUILD_DIR" - Project build directory