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> Note
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The prefetch method is not necessarily called for every cell in the table view. See Loading Data Asynchronously for details on a suggested approach to loading data.
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自分で検証用プロジェクトを作って試してみたところ、collectionView の collectionViewLayout を設定したら呼ばれるようになりました。
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```swift
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collectionView.collectionViewLayout = UICollectionViewFlowLayout()
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```
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