从未调用CollectionView sizeForItemAtIndexPath [英] CollectionView sizeForItemAtIndexPath never called

问题描述

这让我抓狂！我有一个UICollectionViewController，如下所示：

This is driving me crazy! I have a UICollectionViewController as shown below:

class PhrasesCompactCollectionViewController: UICollectionViewController

正在调用numberOfSections和cellForItemAt，但从不调用sizeForItemAtIndexPath。我在其他地方使用相同的确切代码，它正确触发。我正在使用Xcode 8 Beta 6.

The numberOfSections and cellForItemAt are being called but the sizeForItemAtIndexPath is never called. I am using the same exact code somewhere else and it fires correctly. I am using Xcode 8 Beta 6.

func collectionView(collectionView: UICollectionView,
                        layout collectionViewLayout: UICollectionViewLayout,
                        sizeForItemAtIndexPath indexPath:  NSIndexPath) -> CGSize {

        return CGSize(width: 120, height:120) 
    }

推荐答案

您需要在类声明中指定实现协议 UICollectionViewDelegateFlowLayout 。

You need to specify that you implement the protocol UICollectionViewDelegateFlowLayout in your class declaration.

class PhrasesCompactCollectionViewController：UICollectionViewController，UICollectionViewDelegateFlowLayout


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