单ViewController中两个UICollectionView报错求助

Hey there, let's break down why you're hitting this error and how to fix it straight away. That error message is telling you your app can't locate a collection view cell with the identifier InProgressCVC — this almost always happens because you haven't properly registered the cell or linked it up in your storyboard.

Option 1: If you're using a prototype cell in Storyboard #

If you built InProgressCVC as a prototype cell directly in your Storyboard, follow these steps to fix the issue:

• Open your Storyboard and navigate to the FeedVC scene.
• Locate the collectionViewProgress UICollectionView.
• Select its prototype cell, then open the Attributes Inspector:
  • Make sure the Identifier field is exactly InProgressCVC (capitalization and spelling matter!).
• Next, open the Identity Inspector for that prototype cell:
  • Confirm the Class is set to InProgressCVC (not the default UICollectionViewCell).
• Double-check that your collectionViewProgress IBOutlet is correctly connected to the CollectionView in the Storyboard (no broken connection lines).

Option 2: If you're using a separate XIB or code-only cell #

If your InProgressCVC lives in a separate XIB file or is written entirely in code, you need to register it explicitly in viewDidLoad:

For a XIB-based cell: #

Add this line right after setting the delegate and dataSource for collectionViewProgress:

collectionViewProgress.register(UINib(nibName: "InProgressCVC", bundle: nil), forCellWithReuseIdentifier: "InProgressCVC")

For a code-only cell: #

Use this line instead:

collectionViewProgress.register(InProgressCVC.self, forCellWithReuseIdentifier: "InProgressCVC")

Quick double-check #

Since your first collection view (collectionView) is working, compare its setup to collectionViewProgress — you almost certainly missed the same registration/linking step for the second one. Also, make sure InProgressCVC properly subclasses UICollectionViewCell (no typos in the class definition!).

内容的提问来源于stack exchange，提问作者Robbie Wais