blocks|key|2726453|text|设置集合视图的collectionViewLayout的scrollDirection。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2726454|文档是here。|2726455|entityMap|0|LINK|mutability|MUTABLE|url|https://developer.apple.com/library/ios/documentation/UIKit/Reference/UICollectionViewFlowLayout_class/Reference/Reference.html#//apple_ref/doc/uid/TP40012182-CH1-SW6^0|7|K|S|F|0|3|4|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@$9|Q|A|R|B|C]|$9|S|A|T|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|U|8|@]|D|@$9|V|A|W|1|X]]|E|$]]|$1|H|3|-4|5|6|7|Y|8|@]|D|@]|E|$]]]|I|$J|$5|K|L|M|E|$N|O]]]]

Set the <code>scrollDirection</code> of the collection view's <code>collectionViewLayout</code>. 

Docs are <a href="https://developer.apple.com/library/ios/documentation/UIKit/Reference/UICollectionViewFlowLayout_class/Reference/Reference.html#//apple_ref/doc/uid/TP40012182-CH1-SW6" rel="noreferrer">here</a>.

blocks|key|42437|text|UICollectionViewFlowLayout+*flowLayout+=+[[UICollectionViewFlowLayout+alloc]+init];
[flowLayout+setScrollDirection:UICollectionViewScrollDirectionVertical];|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|42438|unstyled|42439|还请注意，在流布局中的prepareForLayout中调用它似乎很好……|offset|length|style|CODE|42440|@interface+LayoutHorizontalThings+:+UICollectionViewFlowLayout
@end

@implementation+LayoutHorizontalBooks
-(void)prepareLayout
++++{
++++[super+prepareLayout];

++++self.scrollDirection+=+UICollectionViewScrollDirectionHorizontal;

++++self.minimumInteritemSpacing+=+0;
++++self.minimumLineSpacing+=+0;
++++self.itemSize+=+CGSizeMake(110,130);
++++self.sectionInset+=+UIEdgeInsetsMake(0,+0,+0,+0);
++++}|42441|entityMap^0|0|0|B|G|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|Q|8|@]|9|@]|A|$]]|$1|F|3|G|5|E|7|R|8|@$H|S|I|T|J|K]]|9|@]|A|$]]|$1|L|3|M|5|6|7|U|8|@]|9|@]|A|$B|C]]|$1|N|3|-4|5|E|7|V|8|@]|9|@]|A|$]]]|O|$]]

<pre><code>UICollectionViewFlowLayout *flowLayout = [[UICollectionViewFlowLayout alloc] init];
[flowLayout setScrollDirection:UICollectionViewScrollDirectionVertical];
</code></pre>

<hr>

Note too that it seems to be fine to call this in <code>prepareForLayout</code> in your flow layout...

<pre><code>@interface LayoutHorizontalThings : UICollectionViewFlowLayout
@end

@implementation LayoutHorizontalBooks
-(void)prepareLayout
 {
 [super prepareLayout];

 self.scrollDirection = UICollectionViewScrollDirectionHorizontal;

 self.minimumInteritemSpacing = 0;
 self.minimumLineSpacing = 0;
 self.itemSize = CGSizeMake(110,130);
 self.sectionInset = UIEdgeInsetsMake(0, 0, 0, 0);
 }
</code></pre>

blocks|key|42623|text|你应该试试这个：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|42624|-+(void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation+duration:(NSTimeInterval)duration{

++UICollectionViewFlowLayout+*layout+=+(UICollectionViewFlowLayout+*)[self.collectionView+collectionViewLayout];

++if+((toInterfaceOrientation+==+UIInterfaceOrientationLandscapeRight)+%7C%7C+(toInterfaceOrientation+==+UIInterfaceOrientationLandscapeLeft)){
++++layout.scrollDirection+=+UICollectionViewScrollDirectionHorizontal;
++}
++else{
++++layout.scrollDirection+=+UICollectionViewScrollDirectionVertical;
++}+
}|code-block|syntax|javascript|42625|在Swift中：|42626|override+func+willRotateToInterfaceOrientation(toInterfaceOrientation:+UIInterfaceOrientation,+duration:+NSTimeInterval)+{

++++var+layout+=+self.collectionView.collectionViewLayout+as!+UICollectionViewFlowLayout

++++if+((toInterfaceOrientation+==+UIInterfaceOrientation.LandscapeLeft)+%7C%7C+(toInterfaceOrientation+==+UIInterfaceOrientation.LandscapeRight)){

++++++++layout.scrollDirection+=+UICollectionViewScrollDirection.Vertical
++++}
++++else{
+++++++layout.scrollDirection+=+UICollectionViewScrollDirection.Horizontal
++++}

}|42627|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

You should try this:

<pre><code>- (void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration{

 UICollectionViewFlowLayout *layout = (UICollectionViewFlowLayout *)[self.collectionView collectionViewLayout];

 if ((toInterfaceOrientation == UIInterfaceOrientationLandscapeRight) || (toInterfaceOrientation == UIInterfaceOrientationLandscapeLeft)){
 layout.scrollDirection = UICollectionViewScrollDirectionHorizontal;
 }
 else{
 layout.scrollDirection = UICollectionViewScrollDirectionVertical;
 } 
}
</code></pre>

In Swift:

<pre><code>override func willRotateToInterfaceOrientation(toInterfaceOrientation: UIInterfaceOrientation, duration: NSTimeInterval) {

 var layout = self.collectionView.collectionViewLayout as! UICollectionViewFlowLayout

 if ((toInterfaceOrientation == UIInterfaceOrientation.LandscapeLeft) || (toInterfaceOrientation == UIInterfaceOrientation.LandscapeRight)){

 layout.scrollDirection = UICollectionViewScrollDirection.Vertical
 }
 else{
 layout.scrollDirection = UICollectionViewScrollDirection.Horizontal
 }

}
</code></pre>

blocks|key|42735|text|感谢芒迪和丹·罗森斯塔克的回答，这是swift+4.2版本。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|42736|if+let+flowLayout+=+collectionView.collectionViewLayout+as?+UICollectionViewFlowLayout+{
++++flowLayout.scrollDirection+=+.horizontal
}|code-block|syntax|javascript|42737|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Kudos to Mundi and Dan Rosenstark for their answer, here's the swift 4.2 version. 

<pre><code>if let flowLayout = collectionView.collectionViewLayout as? UICollectionViewFlowLayout {
 flowLayout.scrollDirection = .horizontal
}
</code></pre>

blocks|key|2726495|text|在您的Storyboard中执行此操作。从标识检查器中选择滚动方向，然后选择您的方向。|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|2726496|​|2726497|📷|atomic|2726498|2726499|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/1b74f5798bbba358be40fec8b771b724.png|imageAlt^0|3|A|0|0|0|1|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@$9|V|A|W|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|X|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|Y|8|@]|D|@$9|Z|A|10|1|11]]|E|$]]|$1|K|3|G|5|6|7|12|8|@]|D|@]|E|$]]|$1|L|3|-4|5|6|7|13|8|@]|D|@]|E|$]]]|M|$N|$5|O|P|Q|E|$R|S|T|-4]]]]

Do that in your Storyboard. From identity inspector and select the
Scroll Direction and choose your direction.
<a href="https://i.stack.imgur.com/N4GX6.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/N4GX6.png" alt="enter image description here" /></a>

blocks|key|2726504|text|Swift+4和4.2|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2726505|if+let+layout+=+collectionViewObj.collectionViewLayout+as?+UICollectionViewFlowLayout+{
++++++++layout.scrollDirection+=+.vertical++//+.horizontal
++++}|code-block|syntax|javascript|2726506|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Swift 4 and 4.2

<pre><code>if let layout = collectionViewObj.collectionViewLayout as? UICollectionViewFlowLayout {
 layout.scrollDirection = .vertical // .horizontal
 }
</code></pre>

I have a UICollectionView in my storyboard based iOS app.
When the device is in the portrait orientation I'd like it to scroll vertically, and when it's in Landscaper I'd like it to scroll horizontally.

In UICollectionView I can see the scrollEnabled member, but I can see no way to set the scroll direction. Have I missed something?

How can I change the scroll direction in UICollectionView?

Swift

我的基于故事板的iOS应用程序中有一个UICollectionView。当设备处于纵向时，我希望它是垂直滚动的，而当它处于景观时，我希望它是水平滚动的。在UICollectionView中，我可以看到scrollEnabled成员，但我看不到设置滚动方向的方法。我错过了什么吗？

问如何在UICollectionView中更改滚动方向？
EN

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