Creating a custom UIScrollView Scroller

Okay, I have been all over the internet trying to find the answer to this, I am trying to create a custom UIScrollView scroller.

Here is a link to a picture of the scroller (that white box is just for me to test the scrollview)

I have gotten the scroller to work, although I need help figuring out how many pixels the scrollview should move every time the scroller is pushed

here is some code

-(IBAction)scroller_bar:(id)sender withEvent:(UIEvent *)event{    
UIButton *button_sent = (UIButton *)sender;

UITouch *touch = [[event touchesForView:button_sent] anyObject];

CGPoint previousLocation = [touch previousLocationInView:button_sent];
CGPoint location = [touch locationInView:button_sent];
CGFloat delta_x = location.x - previousLocation.x;
float left_side = + delta_x;
float right_side = + delta_x;
if (right_side > {
    scroll_right = YES;
    scroll_right = NO;
if (left_side <= 13 + 50.5 || right_side >= 307 - 50.5) {

else{ = CGPointMake( + delta_x,

    if (scroll_right) {

    [selection_scroll setContentOffset:CGPointMake(selection_scroll.contentOffset.x - (Help HERE!), selection_scroll.contentOffset.y) animated:YES];

        [selection_scroll setContentOffset:CGPointMake(selection_scroll.contentOffset.x + (Help HERE!), selection_scroll.contentOffset.y) animated:YES];



In the above code you should see a '(Help HERE!)',

that is where i am trying to figure out how many pixels i should move the scroll view. This is a bit of a confusing question, hope you understand.

Thanks :)


I don't know whether APPLE will approve this or not but the code written below can change the scollView 's scroller images

for (UIImageView *img in yourscrollView.subviews) { 
    [img setImage:[UIImage imageNamed:@"your custom scroller image"]];

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