SHARE
TWEET

Scroll direction pulses with a value sensitivity

priore Mar 3rd, 2016 543 Never
Not a member of Pastebin yet? Sign Up, it unlocks many cool features!
  1. @interface ViewController () <UIScrollViewDelegate>
  2. {
  3.     CGFloat initialContentOffset;
  4.     CGFloat previousContentDelta;
  5. }
  6.  
  7. @property (nonatomic, assign) CGFloat senseValue;
  8.  
  9. @end
  10.  
  11. @implementation ViewController
  12.  
  13. - (void)viewDidLoad
  14. {
  15.     [super viewDidLoad];
  16.    
  17.     self.senseValue = 300;
  18. }
  19.  
  20. #pragma mark - UIScollView Delegates
  21.  
  22. - (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView
  23. {
  24.     initialContentOffset = scrollView.contentOffset.x;
  25.     previousContentDelta = 0.f;
  26. }
  27.  
  28. - (void)scrollViewDidScroll:(UIScrollView *)scrollView
  29. {
  30.     CGFloat prevDelta = previousContentDelta;
  31.     CGFloat delta = scrollView.contentOffset.x - initialContentOffset;
  32.    
  33.     if (fabs(delta - prevDelta) >= self.senseValue) {
  34.         if (delta > 0.f && prevDelta <= 0.f) {
  35.             //
  36.             // scroll from right to left
  37.             //
  38.         } else if (delta < 0.f && prevDelta >= 0.f) {
  39.             //
  40.             // scroll from left to right
  41.             //
  42.         }
  43.        
  44.         previousContentDelta = delta;
  45.     }
  46. }
  47.  
  48. @end
RAW Paste Data
We use cookies for various purposes including analytics. By continuing to use Pastebin, you agree to our use of cookies as described in the Cookies Policy. OK, I Understand
Top