How to set Header View of UItableview To stick at the top in iOS

//To stick the header to the Table view

-(void)scrollViewDidScroll:(UIScrollView *)scrollView

{

    CGFloat sectionHeaderHeight = 50;

    if (scrollView.contentOffset.y<=sectionHeaderHeight&&scrollView.contentOffset.y>=0)

    {

        scrollView.contentInset = UIEdgeInsetsMake(-scrollView.contentOffset.y, 0, 0, 0);

    } else if (scrollView.contentOffset.y>=sectionHeaderHeight)

    {

        scrollView.contentInset = UIEdgeInsetsMake(-sectionHeaderHeight, 0, 0, 0);

    }

}

How to set Navigation Bar font style and font through out application in iOS

    in App delegate

    [[UINavigationBar appearance] setTitleTextAttributes:

     [NSDictionary dictionaryWithObjectsAndKeys:

      

      [UIColor blueColor], UITextAttributeTextColor,

      

       [UIColor greenColor], UITextAttributeTextShadowColor,

      

      [NSValue valueWithUIOffset:UIOffsetMake(-3, 3)], UITextAttributeTextShadowOffset,

      

      [UIFont fontWithName:@"Futura-CondensedMedium" size:20.0], UITextAttributeFont,

      

      nil]];

Navigation Bar Bagground image

  UINavigationBar *navBar =[[self navigationController] navigationBar];

     [navBar setBackgroundImage:[UIImage imageNamed:@"topbar_bg.png"]  forBarMetrics:UIBarMetricsDefault];

How to Customize UIActionSheet buttons in iOS

- (void)willPresentActionSheet:(UIActionSheet *)actionSheet  // before animation and showing view

{

    //To Grayed out Cancel button if there is no loaded image

    for (UIView* view in [actionSheet subviews])

    {

        if ([[[view class] description] isEqualToString:@"UIAlertButton"])

        {

            if ([view respondsToSelector:@selector(title)])

            {

                NSString* title = [view performSelector:@selector(title)];

                

                if ([title isEqualToString:@"Cancel"] && [view respondsToSelector:@selector(setEnabled:)])

                {

                    if(imageView.image == nil)

                    {

                        view.backgroundColor = [UIColor grayColor];

                        view.alpha = 0.5;

                    }

                }

            }

        }

    }

}

iPhone Disabling UIActionSheet buttons

http://stackoverflow.com/questions/743636/iphone-disabling-uiactionsheet-buttons

How to COMBINE / MERGE two images into ONE image in iOS

// combine/ merge two images into one image

- (UIImage*)imageByCombiningImage:(UIImage*)firstImage withImage:(UIImage*)secondImage

{

    UIImage *image = nil;

    

    CGSize newImageSize = CGSizeMake(MAX(firstImage.size.width, secondImage.size.width), MAX(firstImage.size.height, secondImage.size.height));

    if (UIGraphicsBeginImageContextWithOptions != NULL) {

        UIGraphicsBeginImageContextWithOptions(newImageSize, NO, [[UIScreen mainScreen] scale]);

    } else {

        UIGraphicsBeginImageContext(newImageSize);

    }

    [firstImage drawAtPoint:CGPointMake(roundf((newImageSize.width-firstImage.size.width)/2),

                                        roundf((newImageSize.height-firstImage.size.height)/2))];

    [secondImage drawAtPoint:CGPointMake(roundf((newImageSize.width-secondImage.size.width)/2),

                                         roundf((newImageSize.height-secondImage.size.height)/2))];

    image = UIGraphicsGetImageFromCurrentImageContext();

    UIGraphicsEndImageContext();

    

    return image;

}