UICollectionView reloadData中的错误

Question

What I do: rootVC —> modalView1 —> modalView2 —> modalView3 —> dismiss modalView3 to rootVC then reload collectionView

the collectionView is in the rootVC.

This is the code for going back to rootVC: self.view.window!.rootViewController?.dismiss(animated: true, completion: nil)

dismissing to rootVC is working but error occurs during collectionView.reloadData()

Thanks in advance!

Answer 1

首先，错误消息是“ found nil”，因此，在这段代码中，collectionView为nil，您可以找到collectionView的内容，例如标记，按钮或标签，其中的某些内容一定不要连接collectionView。