This is fairly straightforward, however you must implement the paging aspect yourself (which is fairly simple). You don't need gesture recognizers.

Swift

First, adjust your UIScrollView deceleration rate:

scrollView.decelerationRate = UIScrollViewDecelerationRateFast

Assume we have an array of content — let's call it yourPagesArray. In your UIScrollViewDelegate, implement the following method:

func scrollViewWillEndDragging(_ scrollView: UIScrollView, withVelocity velocity: CGPoint, targetContentOffset: UnsafeMutablePointer<CGPoint>){    //This is the index of the "page" that we will be landing at    let nearestIndex = Int(CGFloat(targetContentOffset.pointee.x) / scrollView.bounds.size.width + 0.5)    //Just to make sure we don't scroll past your content    let clampedIndex = max( min( nearestIndex, yourPagesArray.count - 1 ), 0 )    //This is the actual x position in the scroll view    var xOffset = CGFloat(clampedIndex) * scrollView.bounds.size.width    //I've found that scroll views will "stick" unless this is done    xOffset = xOffset == 0.0 ? 1.0 : xOffset    //Tell the scroll view to land on our page    targetContentOffset.pointee.x = xOffset}

You will also need to implement the following delegate method, to handle the case where the user lifts their finger gently without causing any scroll deceleration:

(Update: you may not need to do this under the latest iOS SDK. It seems like the above delegate method is now called when there is zero velocity.)

func scrollViewDidEndDragging(_ scrollView: UIScrollView, willDecelerate decelerate: Bool){    if !decelerate    {        let currentIndex = floor(scrollView.contentOffset.x / scrollView.bounds.size.width)        let offset = CGPoint(x: scrollView.bounds.size.width * currentIndex, y: 0)        scrollView.setContentOffset(offset, animated: true)    }}

Objective-C

Setting your deceleration rate:

scrollView.decelerationRate = UIScrollViewDecelerationRateFast;

Then your scroll view delegate implementation:

- (void) scrollViewWillEndDragging:(UIScrollView *)scroll withVelocity:(CGPoint)velocity targetContentOffset:(inout CGPoint *)targetContentOffset{    //This is the index of the "page" that we will be landing at    NSUInteger nearestIndex = (NSUInteger)(targetContentOffset->x / scrollView.bounds.size.width + 0.5f);       //Just to make sure we don't scroll past your content    nearestIndex = MAX( MIN( nearestIndex, yourPagesArray.count - 1 ), 0 );    //This is the actual x position in the scroll view    CGFloat xOffset = nearestIndex * scrollView.bounds.size.width;    //I've found that scroll views will "stick" unless this is done    xOffset = xOffset==0?1:xOffset;    //Tell the scroll view to land on our page    *targetContentOffset = CGPointMake(xOffset, targetContentOffset->y);}- (void) scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate{    if( !decelerate )    {        NSUInteger currentIndex = (NSUInteger)(scrollView.contentOffset.x / scrollView.bounds.size.width);        [scrollView setContentOffset:CGPointMake(scrollView.bounds.size.width * currentIndex, 0) animated:YES];    }}

I think we can set scrollView.userInteractionEnabled = NO when our finger touch it. And then when the animation is stop ,open it .It works for me.Hope it will help you.

-(void)scrollViewWillBeginDragging:(UIScrollView *)scrollView{    scrollView.userInteractionEnabled = NO;}// at the end of scroll animation, reset the boolean used when scrolls originate from the UIPageControl- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView {    scrollView.userInteractionEnabled = YES;}