How to scroll the content without scrolling the image in the background using UIScrollView ?

Question

I am trying to scroll the content without scrolling the image in the background using UIScrollView.

I am using IB and setting the FileOwner View to point to the Scroll View (Image View is a child of the Scroll view). I have made the image height to be 960 pixels.

I have also set scrolling content size in the vierController that owns this UIView

• (void)viewDidLoad { UIScrollView *tempScrollView = (UIScrollView *)self.view; tempScrollView.contentSize=CGSizeMake(320, 960); }

My problem is that the Image only appears moves along with the content.

I have tried taking out the settings in viewDidLoad, but the scrolling cease to function.

I have also tried changing the location of the image and have it placed under VIEW instead of Scoll View (by the way Scroll View is a child of VIEW), but that resulted in the app breaking (termination error).

Any advice would be appreciated.

Answer 1

The easiest (and correct way) is to set an background image to your UIScrollView

UIImage *img = [UIImage imageNamed:@"image.png"];
[scrollView setBackgroundColor:[UIColor colorWithPatternImage:img]];

Answer 2

Thanks. This was extremely helpful.

The one thing that I would add (pardon if it is obvious, but for people new to the platform (i.e., me), it took a bit of playing around).

I put the code from "unset"'s example after where I setup the contentSize=CGSizeMake in the viewDidLoad of the UIViewController , i.e.,:

// Setup the Scroll View
UIScrollView *tempScrollView=(UIScrollView *)self.view;
tempScrollView.contentSize=CGSizeMake(320, 720);

// Set Stationary Background, so that while the user scroll the background is
// fixed.
UIImage *img = [UIImage imageNamed:@"bg-body.jpg"];
[tempScrollView setBackgroundColor:[UIColor colorWithPatternImage:img]];

Then, I went into the ViewController .xib file and on the UIView that is inside of the UIScrollView, I set the background color to "Clear Color".

I sure that there is a way to do this through code at the same time as setting the background of the UIScrollView, but at least that is how you can do it through IB.

Jason