How to Calculate Scrollview width and height on every scroll in iOS

Question

I have Scrollview using for displaying images along with two buttons previous and next.

Now my problem is when the user is scrolling the image I want to identify whether it is from right to left scroll or vice versa. For this purpose I have to calculate scrollview contentOffset and scrollview frame size but I don't know how to calculate those values. Still now I used:

- (void)scrollViewWillEndDragging:(UIScrollView *)scrollView withVelocity:(CGPoint)velocity targetContentOffset:(inout CGPoint *)targetContentOffset NS_AVAILABLE_IOS(5_0){}

this method.

need any suggestions.

Answer 1

- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView1 willDecelerate:(BOOL)decelerate;
{
    CGFloat pageWidth = scrollView.frame.size.width;

    float fractionalPage = scrollView.contentOffset.x / pageWidth;

    NSInteger page = lround(fractionalPage);

    if (previousPage != page){

        if ([scrollView.panGestureRecognizer translationInView:scrollView.superview].x > 0){

            NSLog(@"-1");
        } else {

            NSLog(@"+1");
        }
    }
}

Answer 2

Hi if you are scrolling Horizontally you will get to know whether you are going next or previous depending upon velocity.x

velocity.x > 0 ?(int) _currentIndex + 1 :(int) _currentIndex - 1;

-(void) scrollViewWillBeginDragging:(UIScrollView *)scrollView {


    CGFloat xAxisVisible= self.uiScrollDetails.contentOffset.x;
    self.currentIndex=xAxisVisible/320;

    NSLog(@"Dragging - You are now on page %i",(int) self.currentIndex);
}