答案 0 :(得分：64)
您可以使用UIScrollView委托方法。将您的类设置为滚动视图的委托，然后实现以下内容：
- (void)scrollViewWillEndDragging:(UIScrollView *)scrollView withVelocity:(CGPoint)velocity targetContentOffset:(inout CGPoint *)targetContentOffset
{
CGFloat kMaxIndex = 23;
CGFloat targetX = scrollView.contentOffset.x + velocity.x * 60.0;
CGFloat targetIndex = round(targetX / (kCellWidth + kCellSpacing));
if (targetIndex < 0)
targetIndex = 0;
if (targetIndex > kMaxIndex)
targetIndex = kMaxIndex;
targetContentOffset->x = targetIndex * (kCellWidth + kCellSpacing);
}
速度参数对于确保滚动感觉自然是必要的，并且当手指仍在移动时触摸结束时不会突然结束。单元格宽度和单元格间距是页面宽度和视图中页面之间的间距。在这种情况下，我使用的是UICollectionView。
答案 1 :(得分：22)
scroll.clipsToBounds = NO 创建一个UIView子类（例如HackClipView）并覆盖hitTest：withEvent：方法
-(UIView *) hitTest:(CGPoint) point withEvent:(UIEvent *)event
{
UIView* child = [super hitTest:point withEvent:event];
if (child == self && self.subviews.count > 0)
{
return self.subviews[0];
}
return child;
}
设置HackClipView.clipsToBounds = YES
有关详细信息，请参阅this answer
更新的
正如lucius回答中所述，您现在可以实现UIScollViewDelegate协议并使用- (void)scrollViewWillEndDragging:(UIScrollView *)scrollView withVelocity:(CGPoint)velocity targetContentOffset:(inout CGPoint *)targetContentOffset方法。因为targetContentOffset是一个指针。使用此方法不能保证滚动视图页面的结果相同，因为用户可以一次滚动浏览多个页面。但是将descelerationRate设置为fast将几乎给您相同的结果
答案 2 :(得分：11)
您应该禁用分页并在滚动视图中添加UIPanGestureRecognizer并自行处理分页。
- (void)viewDidLoad {
[super viewDidLoad];
CGRect viewRect = self.view.bounds; // View controller's view bounds
theScrollView = [[UIScrollView alloc] initWithFrame:viewRect];
theScrollView.scrollsToTop = NO;
theScrollView.pagingEnabled = NO;
theScrollView.delaysContentTouches = NO;
theScrollView.delegate = self;
[self.view addSubview:theScrollView];
UIPanGestureRecognizer * peter = [[[UIPanGestureRecognizer alloc] initWithTarget:self
action:@selector(handlePan:)]
autorelease];
[theScrollView addGestureRecognizer:peter];
}
-(void)handlePan:(UIPanGestureRecognizer*)recognizer{
switch (recognizer.state) {
case UIGestureRecognizerStateBegan:{
// panStart and startPoint are instance vars for the viewContainer
panStart = theScrollView.contentOffset;
startPoint = [recognizer locationInView:theScrollView];
break;
}
case UIGestureRecognizerStateChanged:{
CGPoint newPoint = [recognizer locationInView:theScrollView];
CGFloat delta = startPoint.x - newPoint.x;
if ( abs(delta) > 2)
theScrollView.contentOffset = CGPointMake( theScrollView.contentOffset.x + delta, 0);
CGFloat moveDelta = panStart.x - theScrollView.contentOffset.x;
// current witdh should hold the currently displayed page/view in theScrollView
if ( abs(moveDelta) > (currentWidth * 0.40)){
panStart = theScrollView.contentOffset;
startPoint = newPoint;
//NSLog(@"delta is bigger");
if ( moveDelta < 0 )
[self incrementPageNumber]; // you should implement this method and present the next view
else
[self decrementPageNumber]; // you should implement this method and present the previous view
recognizer.enabled = NO; // disable further event until view change finish
}
break;
}
case UIGestureRecognizerStateEnded:
case UIGestureRecognizerStateCancelled:
recognizer.enabled = YES;
[self showDocumentPage:currentPage];
break;
default:
break;
}
}
答案 3 :(得分：3)
可简化重复使用的Swift 4.1解决方案：
Presto 0.194只需在您的UIScrollView / UITableView / UICollectionView委托中遵守Presto 0.206协议，就可以完成操作，例如：
/// Protocol that simplifies custom page size configuration for UIScrollView.
/// Sadly, can not be done better due to protocol extensions limitations - https://stackoverflow.com/questions/39487168/non-objc-method-does-not-satisfy-optional-requirement-of-objc-protocol
/// - note: Set `.decelerationRate` to `UIScrollViewDecelerationRateFast` for a fancy scrolling animation.
protocol ScrollViewCustomHorizontalPageSize: UIScrollViewDelegate {
/// Custom page size
var pageSize: CGFloat { get }
/// Helper method to get current page fraction
func getCurrentPage(scrollView: UIScrollView) -> CGFloat
/// Helper method to get targetContentOffset. Usage:
///
/// func scrollViewWillEndDragging(_ scrollView: UIScrollView, withVelocity velocity: CGPoint, targetContentOffset: UnsafeMutablePointer<CGPoint>) {
/// targetContentOffset.pointee.x = getTargetContentOffset(scrollView: scrollView, velocity: velocity)
/// }
func getTargetContentOffset(scrollView: UIScrollView, velocity: CGPoint) -> CGFloat
/// Must be implemented. See `getTargetContentOffset` for more info.
func scrollViewWillEndDragging(_ scrollView: UIScrollView, withVelocity velocity: CGPoint, targetContentOffset: UnsafeMutablePointer<CGPoint>)
}
extension ScrollViewCustomHorizontalPageSize {
func getCurrentPage(scrollView: UIScrollView) -> CGFloat {
return (scrollView.contentOffset.x + scrollView.contentInset.left) / pageSize
}
func getTargetContentOffset(scrollView: UIScrollView, velocity: CGPoint) -> CGFloat {
let targetX: CGFloat = scrollView.contentOffset.x + velocity.x * 60.0
var targetIndex = (targetX + scrollView.contentInset.left) / pageSize
let maxOffsetX = scrollView.contentSize.width - scrollView.bounds.width + scrollView.contentInset.right
let maxIndex = (maxOffsetX + scrollView.contentInset.left) / pageSize
if velocity.x > 0 {
targetIndex = ceil(targetIndex)
} else if velocity.x < 0 {
targetIndex = floor(targetIndex)
} else {
let (maxFloorIndex, lastInterval) = modf(maxIndex)
if targetIndex > maxFloorIndex {
if targetIndex >= lastInterval / 2 + maxFloorIndex {
targetIndex = maxIndex
} else {
targetIndex = maxFloorIndex
}
} else {
targetIndex = round(targetIndex)
}
}
if targetIndex < 0 {
targetIndex = 0
}
var offsetX = targetIndex * pageSize - scrollView.contentInset.left
offsetX = min(offsetX, maxOffsetX)
return offsetX
}
}
为方便滚动，我还建议设置ScrollViewCustomPageSize
答案 4 :(得分：1)
设置contentOffset
-(void)scrollViewDidScroll:(UIScrollView *)scrollView方法。
答案 5 :(得分：1)
我遇到了同样的问题所以我制作了一个自定义的UIScrollView。 它现在在Github上可用，因为当我搜索时，我没有找到这样的任何解决方案。请享用！ https://github.com/MartinMetselaar/MMCPSScrollView
MMCPSScrollView* scrollView = [[MMCPSScrollView alloc] initWithFrame:self.view.bounds];
[scrollView setType:MMCPSScrollVertical];
[scrollView setPageHeight:250];
[scrollView setPageSize:2];
[self.view addSubview:scrollView];
如果您对此组件有任何其他疑问，请询问。
答案 6 :(得分：0)
我之前遇到过同样的问题。我的方法是在滚动视图中添加第二个UIScrollView。所以你可以切换到页面。在该页面上看起来似乎比页面大于屏幕。我希望它也适用于你的情况。 ; - ）
Sandro Meier
答案 7 :(得分：0)
这似乎对我来说好多了：
这里他们将scrollview（保持其分页的好处）添加为UTIew的ExtendedTouchView或子类的子视图并覆盖命中测试方法
- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event {
if ([self pointInside:point withEvent:event]) {
if ([[self subviews] count] > 0) {
//force return of first child, if exists
return [[self subviews] objectAtIndex:0];
} else {
return self;
}
}
return nil;
}
这完全符合我想要的最少的代码和头痛。
答案 8 :(得分：0)
添加手势识别器或其他子视图等是愚蠢的。只需将滚动视图的委托设置为以下内容：
// This is for a vertical scrolling scroll view.
// Let's say you want it to snap to every 160 pixels :
- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate
{
int y = scrollView.contentOffset.y;
int yOff = y % 160;
if(yOff < 80)
y -= yOff;
else
y += 160 - yOff;
[scrollView setContentOffset:CGPointMake(scrollView.contentOffset.x, y) animated:YES];
}
// This is for a horizontal scrolling scroll view.
// Let's say you want the same, to snap to every 160 pixels :
- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate
{
int x = scrollView.contentOffset.x;
int xOff = x % 160;
if(xOff < 80)
x -= xOff;
else
x += 160 - xOff;
[scrollView setContentOffset:CGPointMake(x, scrollView.contentOffset.y) animated:YES];
}
答案 9 :(得分：0)
Swift 4.1，iOS11 +：
func scrollViewWillEndDragging(_ scrollView: UIScrollView, withVelocity velocity: CGPoint, targetContentOffset: UnsafeMutablePointer<CGPoint>) {
targetContentOffset.pointee = CGPoint(
x: round(targetContentOffset.pointee.x / pageWidth) * pageWidth,
y: targetContentOffset.pointee.y
)
}
答案 10 :(得分：-3)
最简单的方法是添加此代码
scrollView.clipsToBounds = false
scrollView.removeGestureRecognizer(scrollView.panGestureRecognizer)
view.addGestureRecognizer(scrollView.panGestureRecognizer)