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- @interface ViewController () <UIScrollViewDelegate>
- {
- CGFloat initialContentOffset;
- CGFloat previousContentDelta;
- }
- @property (nonatomic, assign) CGFloat senseValue;
- @end
- @implementation ViewController
- - (void)viewDidLoad
- {
- [super viewDidLoad];
- self.senseValue = 300;
- }
- #pragma mark - UIScollView Delegates
- - (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView
- {
- initialContentOffset = scrollView.contentOffset.x;
- previousContentDelta = 0.f;
- }
- - (void)scrollViewDidScroll:(UIScrollView *)scrollView
- {
- CGFloat prevDelta = previousContentDelta;
- CGFloat delta = scrollView.contentOffset.x - initialContentOffset;
- if (fabs(delta - prevDelta) >= self.senseValue) {
- if (delta > 0.f && prevDelta <= 0.f) {
- //
- // scroll from right to left
- //
- } else if (delta < 0.f && prevDelta >= 0.f) {
- //
- // scroll from left to right
- //
- }
- previousContentDelta = delta;
- }
- }
- @end
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