UICollectionView设置列数 [英] UICollectionView Set number of columns

问题描述

我刚开始学习UICollectionViews。我想知道是否有人知道如何指定集合视图中的列数。默认设置为3（iPhone /肖像）。我查看了文档，似乎无法找到简明的答案。

I just started learning about UICollectionViews. I'm wondering if anyone knows how to specify the number of columns in a collectionview. The default is set to 3 (iPhone/portrait). I've looked at the documentation and can't seem to find a concise answer.

推荐答案

CollectionViews功能非常强大，而且它们非常强大付出代价。很多，有很多选择。正如omz所说：

CollectionViews are very powerful, and they come at a price. Lots, and lots of options. As omz said:

有多种方法可以改变列数

there are multiple ways you could change the number of columns

我建议实施 < UICollectionViewDelegateFlowLayout> 协议，通过以下方法，您可以更好地控制<$的布局c $ c> UICollectionView ，无需对其进行子类化：

I'd suggest implementing the <UICollectionViewDelegateFlowLayout> Protocol, giving you access to the following methods in which you can have greater control over the layout of your UICollectionView, without the need for subclassing it:

• collectionView： layout：insetForSectionAtIndex：


• collectionView：layout：minimumInteritemSpacingForSectionAtIndex：


• collectionView：layout：minimumLineSpacingForSectionAtIndex：


• collectionView：layout：referenceSizeForFooterInSection：


• collectionView：layout：referenceSizeForHea derInSection：


• collectionView：layout：sizeForItemAtIndexPath：

• collectionView:layout:insetForSectionAtIndex:
• collectionView:layout:minimumInteritemSpacingForSectionAtIndex:
• collectionView:layout:minimumLineSpacingForSectionAtIndex:
• collectionView:layout:referenceSizeForFooterInSection:
• collectionView:layout:referenceSizeForHeaderInSection:
• collectionView:layout:sizeForItemAtIndexPath:

此外，实现以下方法将强制您的UICollectionView在方向更改时更新它的布局:(假设您想为景观重新调整单元格大小并使它们伸展）

Also, implementing the following method will force your UICollectionView to update it's layout on an orientation change: (say you wanted to re-size the cells for landscape and make them stretch)

-(void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation
                               duration:(NSTimeInterval)duration{

    [self.myCollectionView.collectionViewLayout invalidateLayout];
}

此外，这里有2个非常好的教程 UICollectionViews ：

Additionally, here are 2 really good tutorials on UICollectionViews:

http://www.raywenderlich.com/22324/beginning-uicollectionview-in-ios-6-part-12

http://skeuo.com/uicollectionview-custom-layout-tutorial

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