blocks|key|2180283|text|下面是我找到的获得这种效果的最简单的方法。它包括你的收藏视图和一个额外的秘密滚动视图。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2180284|设置您的收藏视图|offset|length|style|BOLD|2180285|2180286|设置集合视图及其所有数据源方法。|unordered-list-item|2180287|设置集合视图的框架；它应显示您希望的全宽。|2180288|设置集合视图的contentInset_collectionView.contentInset+=+UIEdgeInsetsMake(0，(self.view.frame.size.width-pageSize)/2，0，pageSize|CODE|2180289|2180290|这有助于正确地偏移单元格。|2180291|设置您的秘密滚动视图|2180292|2180293|创建一个滚动视图，把它放在你喜欢的任何地方。如果您愿意，可以将其设置为hidden。|2180294|将滚动视图的边界大小设置为所需的页面大小。|2180295|将您自己设置为集合视图的预期内容大小的scrollview.|2180296|Set的委派。|2180297|2180298|2180299|移动您的手势识别器|2180300|2180301|将秘密滚动视图的手势识别器添加到集合视图，并禁用集合视图的手势识别器：|2180302|2180303|_collectionView+addGestureRecognizer:_secretScrollView.panGestureRecognizer；_collectionView.panGestureRecognizer.enabled+=+NO;|2180304|委派|2180305|-+(void)+scrollViewDidScroll:(UIScrollView+*)scrollView+{
++++CGPoint+contentOffset+=+scrollView.contentOffset;
++++contentOffset.x+=+contentOffset.x+-+_collectionView.contentInset.left;
++++_collectionView.contentOffset+=+contentOffset;
}|code-block|syntax|javascript|2180306|随着滚动视图的移动，获取它的偏移量，并将其设置为集合视图的偏移量。|2180307|我在这里写了这个博客，所以请查看以下链接以获取更新：http://khanlou.com/2013/04/paging-a-overflowing-collection-view/|2180308|entityMap|0|LINK|mutability|MUTABLE|url|http://khanlou.com/2013/04/paging-a-overflowing-collection-view/^0|0|0|8|0|0|0|0|7|C|0|0|0|0|A|0|0|Z|6|0|0|0|0|0|0|0|9|0|0|0|0|0|0|2|0|0|0|Q|1S|0|0^^$0|@$1|2|3|4|5|6|7|1X|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|1Y|8|@$D|1Z|E|20|F|G]]|9|@]|A|$]]|$1|H|3|-4|5|6|7|21|8|@]|9|@]|A|$]]|$1|I|3|J|5|K|7|22|8|@]|9|@]|A|$]]|$1|L|3|M|5|K|7|23|8|@]|9|@]|A|$]]|$1|N|3|O|5|K|7|24|8|@$D|25|E|26|F|P]]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|27|8|@]|9|@]|A|$]]|$1|R|3|S|5|6|7|28|8|@]|9|@]|A|$]]|$1|T|3|U|5|6|7|29|8|@$D|2A|E|2B|F|G]]|9|@]|A|$]]|$1|V|3|-4|5|6|7|2C|8|@]|9|@]|A|$]]|$1|W|3|X|5|K|7|2D|8|@$D|2E|E|2F|F|P]]|9|@]|A|$]]|$1|Y|3|Z|5|K|7|2G|8|@]|9|@]|A|$]]|$1|10|3|11|5|K|7|2H|8|@]|9|@]|A|$]]|$1|12|3|13|5|K|7|2I|8|@]|9|@]|A|$]]|$1|14|3|-4|5|K|7|2J|8|@]|9|@]|A|$]]|$1|15|3|-4|5|6|7|2K|8|@]|9|@]|A|$]]|$1|16|3|17|5|6|7|2L|8|@$D|2M|E|2N|F|G]]|9|@]|A|$]]|$1|18|3|-4|5|6|7|2O|8|@]|9|@]|A|$]]|$1|19|3|1A|5|K|7|2P|8|@]|9|@]|A|$]]|$1|1B|3|-4|5|6|7|2Q|8|@]|9|@]|A|$]]|$1|1C|3|1D|5|6|7|2R|8|@]|9|@]|A|$]]|$1|1E|3|1F|5|6|7|2S|8|@$D|2T|E|2U|F|G]]|9|@]|A|$]]|$1|1G|3|1H|5|1I|7|2V|8|@]|9|@]|A|$1J|1K]]|$1|1L|3|1M|5|6|7|2W|8|@]|9|@]|A|$]]|$1|1N|3|1O|5|6|7|2X|8|@]|9|@$D|2Y|E|2Z|1|30]]|A|$]]|$1|1P|3|-4|5|6|7|31|8|@]|9|@]|A|$]]]|1Q|$1R|$5|1S|1T|1U|A|$1V|1W]]]]

Below is the simplest way that I've found to get this effect. It involves your collection view and an extra secret scroll view.

Set up your collection views

<ul>
<li>Set up your collection view and all its data source methods.</li>
<li>Frame the collection view; it should span the full width that you want to be visible.</li>
<li>Set the collection view's <code>contentInset</code>:

<pre><code>_collectionView.contentInset = UIEdgeInsetsMake(0, (self.view.frame.size.width-pageSize)/2, 0, (self.view.frame.size.width-pageSize)/2);
</code></pre></li>
</ul>

This helps offset the cells properly.

Set up your secret scrollview

<ul>
<li>Create a scrollview, place it wherever you like. You can set it to <code>hidden</code> if you like.</li>
<li>Set the size of the scrollview's bounds to the desired size of your page.</li>
<li>Set yourself as the delegate of the scrollview.</li>
<li>Set its <code>contentSize</code> to the expected content size of your collection view.</li>
</ul>

Move your gesture recognizer

<ul>
<li>Add the secret scrollview's gesture recognizer to the collection view, and disable the collection view's gesture recognizer:

<pre><code>[_collectionView addGestureRecognizer:_secretScrollView.panGestureRecognizer];
_collectionView.panGestureRecognizer.enabled = NO;
</code></pre></li>
</ul>

Delegate

<pre><code>- (void) scrollViewDidScroll:(UIScrollView *)scrollView {
 CGPoint contentOffset = scrollView.contentOffset;
 contentOffset.x = contentOffset.x - _collectionView.contentInset.left;
 _collectionView.contentOffset = contentOffset;
}
</code></pre>

As the scrollview moves, get its offset and set it to the offset of the collection view.

I blogged about this here, so check this link for updates: <a href="http://khanlou.com/2013/04/paging-a-overflowing-collection-view/" rel="noreferrer">http://khanlou.com/2013/04/paging-a-overflowing-collection-view/</a>

blocks|key|2173573|text|前面的代码相当复杂，UICollectionView是UIScrollView的子类，所以只需执行以下操作：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2173574|[self.collectionView+setPagingEnabled:YES];|code-block|syntax|javascript|2173575|你已经准备好了。|2173576|请参阅此detailed+tutorial。|offset|length|2173577|entityMap|0|LINK|mutability|MUTABLE|url|http://adoptioncurve.net/archives/2013/04/creating-a-paged-photo-gallery-with-a-uicollectionview/^0|0|0|0|4|H|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|W|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|X|8|@]|9|@$K|Y|L|Z|1|10]]|A|$]]|$1|M|3|-4|5|6|7|11|8|@]|9|@]|A|$]]]|N|$O|$5|P|Q|R|A|$S|T]]]]

The previous is quite complicated, UICollectionView is a subclass of UIScrollView, so just do this：

<pre><code>[self.collectionView setPagingEnabled:YES];
</code></pre>

You are all set to go.

See this <a href="http://adoptioncurve.net/archives/2013/04/creating-a-paged-photo-gallery-with-a-uicollectionview/" rel="nofollow">detailed tutorial</a>.

blocks|key|2180310|text|在Soroush+answer上做了一点编辑，这对我来说很有效。我所做的唯一编辑没有禁用手势：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2180311|[_collectionView+addGestureRecognizer:_secretScrollView.panGestureRecognizer];
_collectionView.panGestureRecognizer.enabled+=+NO;|code-block|syntax|javascript|2180312|我禁用了集合视图上的滚动：|2180313|_collectionView.scrollEnabled+=+NO;|2180314|禁用手势也会禁用秘密滚动视图手势。|2180315|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

A little edit on Soroush answer, which did the trick for me. 
The only edit I made instead of disabling the gesture:

<pre><code>[_collectionView addGestureRecognizer:_secretScrollView.panGestureRecognizer];
_collectionView.panGestureRecognizer.enabled = NO;
</code></pre>

I disabled scrolling on the collectionview:

<pre><code>_collectionView.scrollEnabled = NO;
</code></pre>

As disabling the gesture disabled the secret scrollview gesture as well.

blocks|key|5230472|text|您可以子类化UICollectionViewFlowLayout并覆盖，如下所示：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5230473|-+(CGPoint)targetContentOffsetForProposedContentOffset:(CGPoint)contentOffset+
+++++++++++++++++++++++++++++++++withScrollingVelocity:(CGPoint)velocity
{
++++NSArray*+layoutAttributesArray+=+
+++[self+layoutAttributesForElementsInRect:self.collectionView.bounds];

++++if(layoutAttributesArray.count+==+0)
++++++++return+contentOffset;


++++UICollectionViewLayoutAttributes*+candidate+=+
++++layoutAttributesArray.firstObject;

++++for+(UICollectionViewLayoutAttributes*+layoutAttributes+in+layoutAttributesArray)
++++{
++++++++if+(layoutAttributes.representedElementCategory+!=+UICollectionElementCategoryCell)
++++++++++++continue;


++++++++if((velocity.x+>+0.0+&&+layoutAttributes.center.x+>+candidate.center.x)+%7C%7C
+++++++++++(velocity.x+<=+0.0+&&+layoutAttributes.center.x+<+candidate.center.x))
++++++++++++candidate+=+layoutAttributes;


++++}

++++return+CGPointMake(candidate.center.x+-+self.collectionView.bounds.size.width+*+0.5f,+contentOffset.y);
}|code-block|syntax|javascript|5230474|这将根据速度获得下一个或上一个单元格...但是，它不会捕捉到当前单元格。|5230475|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

You can subclass UICollectionViewFlowLayout and override like so:

<pre><code>- (CGPoint)targetContentOffsetForProposedContentOffset:(CGPoint)contentOffset 
 withScrollingVelocity:(CGPoint)velocity
{
 NSArray* layoutAttributesArray = 
 [self layoutAttributesForElementsInRect:self.collectionView.bounds];

 if(layoutAttributesArray.count == 0)
 return contentOffset;


 UICollectionViewLayoutAttributes* candidate = 
 layoutAttributesArray.firstObject;

 for (UICollectionViewLayoutAttributes* layoutAttributes in layoutAttributesArray)
 {
 if (layoutAttributes.representedElementCategory != UICollectionElementCategoryCell)
 continue;


 if((velocity.x &gt; 0.0 &amp;&amp; layoutAttributes.center.x &gt; candidate.center.x) ||
 (velocity.x &lt;= 0.0 &amp;&amp; layoutAttributes.center.x &lt; candidate.center.x))
 candidate = layoutAttributes;


 }

 return CGPointMake(candidate.center.x - self.collectionView.bounds.size.width * 0.5f, contentOffset.y);
}
</code></pre>

This will get the next or previous cell depending on the velocity... it will not snap on the current cell however.

blocks|key|5230500|text|我将添加另一个解决方案。就地对齐并不完美(不如设置了分页启用时好，但工作得很好)。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5230501|我尝试实现了Soroush的解决方案，但它对我不起作用。|5230502|因为UICollectionView是UIScrollView的子类，所以它将响应一个重要的UIScrollViewDelegate方法，该方法是：|offset|length|style|CODE|5230503|-+(void)scrollViewWillEndDragging:(UIScrollView+*)scrollView
+++++++++++++++++++++withVelocity:(CGPoint)velocity
++++++++++++++targetContentOffset:(inout+CGPoint+*)targetContentOffset|code-block|syntax|javascript|5230504|targetContentOffset+(输入输出指针)允许您重新定义集合视图的停止点(在这种情况下，如果您水平滑动，则为x+)。|BOLD|5230505|关于下面找到的几个变量的快速说明：|5230506|5230507|self.cellWidth+-这是您的集合视图单元格的宽度(如果您使用want)|unordered-list-item|5230508|self.minimumLineSpacing，您甚至可以对其进行硬编码-这是您在集合视图中包含的对象数组cells|5230509|self.scrollingObjects之间设置的最小行距)|5230510|5230511|因此，我们的想法是在集合视图的委托中实现此方法，如下所示：|5230512|-+(void)scrollViewWillEndDragging:(UIScrollView+*)scrollView
+++++++++++++++++++++withVelocity:(CGPoint)velocity
++++++++++++++targetContentOffset:(inout+CGPoint+*)targetContentOffset
{+++++++
++++if+(self.currentIndex+==+0+&&+velocity.x+<+0)+{
++++++++//+we+have+reached+the+first+user+and+we're+trying+to+go+back
++++++++return;
++++}

++++if+(self.currentIndex+==+(self.scrollingObjects.count+-+1)+&&+velocity.x+>+0)+{
++++++++//+we+have+reached+the+last+user+and+we're+trying+to+go+forward
++++++++return;
++++}

++++if+(velocity.x+<+0)+{
++++++++//+swiping+from+left+to+right+(going+left;+going+back)
++++++++self.currentIndex--;
++++}+else+{
++++++++//+swiping+from+right+to+left+(going+right;+going+forward)
++++++++self.currentIndex%2B%2B;
++++}

++++float+xPositionToStop+=+0;

++++if+(self.currentIndex+==+0)+{
++++++++//+first+row
++++++++xPositionToStop+=+0;
++++}+else+{
++++++++//+one+of+the+next+ones
++++++++xPositionToStop+=+self.currentIndex+*+self.cellWidth+%2B+(self.currentIndex+%2B+1)+*+self.minimumLineSpacing+-+((scrollView.bounds.size.width+-+2*self.minimumLineSpacing+-+self.cellWidth)/2);
++++}

++++targetContentOffset->x+=+xPositionToStop;

++++NSLog(@"Point+of+stopping:+%25@",+NSStringFromCGPoint(*targetContentOffset));
}|5230513|期待着你可能得到的任何反馈，这些反馈会让你的捕捉效果更好。我也会继续寻找更好的解决方案……|5230514|entityMap^0|0|0|2|G|J|C|1A|K|0|0|0|J|1P|1|L|6|0|0|0|0|E|0|0|N|0|0|L|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|1A|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|1B|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|1C|8|@$F|1D|G|1E|H|I]|$F|1F|G|1G|H|I]|$F|1H|G|1I|H|I]]|9|@]|A|$]]|$1|J|3|K|5|L|7|1J|8|@]|9|@]|A|$M|N]]|$1|O|3|P|5|6|7|1K|8|@$F|1L|G|1M|H|I]|$F|1N|G|1O|H|I]|$F|1P|G|1Q|H|Q]]|9|@]|A|$]]|$1|R|3|S|5|6|7|1R|8|@]|9|@]|A|$]]|$1|T|3|-4|5|6|7|1S|8|@]|9|@]|A|$]]|$1|U|3|V|5|W|7|1T|8|@$F|1U|G|1V|H|I]]|9|@]|A|$]]|$1|X|3|Y|5|W|7|1W|8|@$F|1X|G|1Y|H|I]]|9|@]|A|$]]|$1|Z|3|10|5|W|7|1Z|8|@$F|20|G|21|H|I]]|9|@]|A|$]]|$1|11|3|-4|5|6|7|22|8|@]|9|@]|A|$]]|$1|12|3|13|5|6|7|23|8|@]|9|@]|A|$]]|$1|14|3|15|5|L|7|24|8|@]|9|@]|A|$M|N]]|$1|16|3|17|5|6|7|25|8|@]|9|@]|A|$]]|$1|18|3|-4|5|6|7|26|8|@]|9|@]|A|$]]]|19|$]]

I'll add another solution. The snapping in place is not perfect (not as good as when paging enabled is set, but works well enough).

I have tried implementing Soroush's solution, but it doesn't work for me.

Because the <code>UICollectionView</code> is a subclass of <code>UIScrollView</code> it will respond to an important <code>UIScrollViewDelegate</code> method which is:

<pre><code>- (void)scrollViewWillEndDragging:(UIScrollView *)scrollView
 withVelocity:(CGPoint)velocity
 targetContentOffset:(inout CGPoint *)targetContentOffset
</code></pre>

The <code>targetContentOffset</code> (an inout pointer) lets you redefine the stopping point for a collection view (the <code>x</code> in this case if you swipe horizontally).

A quick note about a couple of the variables found below:

<ul>
<li><code>self.cellWidth</code> – this is your collection view cell's width (you can even hardcode it there if you want)</li>
<li><code>self.minimumLineSpacing</code> – this is the minimum line spacing you set between the cells</li>
<li><code>self.scrollingObjects</code> is the array of objects contained in the collection view (I need this mostly for the count, to know when to stop scrolling)</li>
</ul>

So, the idea is to implement this method in the collection view's delegate, like so:

<pre><code>- (void)scrollViewWillEndDragging:(UIScrollView *)scrollView
 withVelocity:(CGPoint)velocity
 targetContentOffset:(inout CGPoint *)targetContentOffset
{ 
 if (self.currentIndex == 0 &amp;&amp; velocity.x &lt; 0) {
 // we have reached the first user and we're trying to go back
 return;
 }

 if (self.currentIndex == (self.scrollingObjects.count - 1) &amp;&amp; velocity.x &gt; 0) {
 // we have reached the last user and we're trying to go forward
 return;
 }

 if (velocity.x &lt; 0) {
 // swiping from left to right (going left; going back)
 self.currentIndex--;
 } else {
 // swiping from right to left (going right; going forward)
 self.currentIndex++;
 }

 float xPositionToStop = 0;

 if (self.currentIndex == 0) {
 // first row
 xPositionToStop = 0;
 } else {
 // one of the next ones
 xPositionToStop = self.currentIndex * self.cellWidth + (self.currentIndex + 1) * self.minimumLineSpacing - ((scrollView.bounds.size.width - 2*self.minimumLineSpacing - self.cellWidth)/2);
 }

 targetContentOffset-&gt;x = xPositionToStop;

 NSLog(@"Point of stopping: %@", NSStringFromCGPoint(*targetContentOffset));
}
</code></pre>

Looking forward to any feedback you may have which makes the snapping in place better. I'll also keep on looking for a better solution...

blocks|key|5230532|text|Swift…中的@Mike+M's+answer|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|5230533|class+CenteringFlowLayout:+UICollectionViewFlowLayout+{

++++override+func+targetContentOffsetForProposedContentOffset(proposedContentOffset:+CGPoint,+withScrollingVelocity+velocity:+CGPoint)+->+CGPoint+{

++++++++guard+let+collectionView+=+collectionView,
++++++++++++let+layoutAttributesArray+=+layoutAttributesForElementsInRect(collectionView.bounds),
++++++++++++var+candidate+=+layoutAttributesArray.first+else+{+return+proposedContentOffset+}

++++++++layoutAttributesArray.filter({$0.representedElementCategory+==+.Cell+}).forEach+{+layoutAttributes+in

++++++++++++if+(velocity.x+>+0+&&+layoutAttributes.center.x+>+candidate.center.x)+%7C%7C
++++++++++++++++(velocity.x+<=+0+&&+layoutAttributes.center.x+<+candidate.center.x)+{
++++++++++++++++candidate+=+layoutAttributes
++++++++++++}
++++++++}

++++++++return+CGPoint(x:+candidate.center.x+-+collectionView.bounds.width+/+2,+y:+proposedContentOffset.y)
++++}

}|code-block|syntax|javascript|5230534|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/a/22454509/123632^0|8|G|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

<a href="https://stackoverflow.com/a/22454509/123632">@Mike M's answer</a> in Swift…

<pre><code>class CenteringFlowLayout: UICollectionViewFlowLayout {

 override func targetContentOffsetForProposedContentOffset(proposedContentOffset: CGPoint, withScrollingVelocity velocity: CGPoint) -&gt; CGPoint {

 guard let collectionView = collectionView,
 let layoutAttributesArray = layoutAttributesForElementsInRect(collectionView.bounds),
 var candidate = layoutAttributesArray.first else { return proposedContentOffset }

 layoutAttributesArray.filter({$0.representedElementCategory == .Cell }).forEach { layoutAttributes in

 if (velocity.x &gt; 0 &amp;&amp; layoutAttributes.center.x &gt; candidate.center.x) ||
 (velocity.x &lt;= 0 &amp;&amp; layoutAttributes.center.x &lt; candidate.center.x) {
 candidate = layoutAttributes
 }
 }

 return CGPoint(x: candidate.center.x - collectionView.bounds.width / 2, y: proposedContentOffset.y)
 }

}
</code></pre>

I want to implement "cards" in my app like Safari tabs or App Store search.

I will show user one card in a center of screen and part of previous and next cards at left and right sides. (See App Store search or Safari tabs for example)

I decided to use <code>UICollectionView</code>, and I need to change page size (didn't find how) or implement own layout subclass (don't know how)?

Any help, please?

UICollectionView: paging like Safari tabs or App Store search

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我想在我的应用程序中实现“卡片”，比如Safari标签或app Store搜索。我将在屏幕中央显示用户一张卡，在左侧和右侧显示前一张和下一张卡的一部分。(例如，参见App Store搜索或Safari标签)我决定使用UICollectionView，我需要改变页面大小(不知道怎么做)或者实现自己的布局子类(不知道怎么做...

问UICollectionView:像Safari标签或App Store搜索那样的分页
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问UICollectionView:像Safari标签或App Store搜索那样的分页EN