Sensitivity/Scroll speed of UIScrollView with paging Sensitivity/Scroll speed of UIScrollView with paging ios ios

Sensitivity/Scroll speed of UIScrollView with paging


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;}


matomo