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

问题描述

我刚刚开始学习 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/人像).我查看了文档，似乎找不到简洁的答案.

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 非常强大，而且它们是有代价的.很多，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:

有多种方法可以更改列数

there are multiple ways you could change the number of columns

我建议实施 <UICollectionViewDelegateFlowLayout> 协议，让您可以访问以下方法，您可以在其中更好地控制 UICollectionView 的布局，而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:referenceSizeForHeaderInSection:
• collectionView:layout:sizeForItemAtIndexPath:

此外，实现以下方法将强制您的 UICollectionView 在方向更改时更新其布局:(假设您想为横向调整单元格的大小并使其拉伸)

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 个关于 UICollectionViews 的非常好的教程:

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

这篇关于UICollectionView 设置列数的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！