具有分页function的UIScrollView的灵敏度/滚动速度
快速扫描之后，我希望UIScrollView快速滚动， 就像这样 。 虽然打开页面时 ，滚动一次只能打印一页 。 是否可以快速滚动，当使用手指滑动启用分页时，无需使用手势识别器手动执行？
这是相当直接的，但是你必须自己实现分页方面（这很简单）。 你不需要手势识别器。
迅速
首先，调整你的UIScrollView减速率：
scrollView.decelerationRate = UIScrollViewDecelerationRateFast 假设我们有一组内容 – 我们称之为yourPagesArray 。 在你的UIScrollViewDelegate中 ，实现下面的方法：
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 }
您还需要实施以下代表方法，以处理用户轻轻抬起手指而不导致任何滚动减速的情况：
（更新：您可能不需要在最新的iOS SDK下执行此操作，看起来上面的代理方法现在在速度为零时调用。
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的
设置你的减速率：
scrollView.decelerationRate = UIScrollViewDecelerationRateFast;
然后你的滚动视图委托实现：
- (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]; } }
我想我们可以设置scrollView.userInteractionEnabled =否当我们的手指触摸它。 然后，当animation停止时，打开它，它为我工作。 希望它会帮助你。
-(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; }