Swift 使用scrollViewDidScroll处理多个集合视图单元格

我目前正在使用

scrollViewDidScroll

设置我的

UICollectionView

单元格偏移量的动画。集合视图以前只包含1

UICollectionViewCell

我刚刚在同一个集合视图中添加了另一个

UICollectionViewCell

，并希望执行相同的动画。问题是，我遇到了一个错误崩溃：

Precondition failed: NSArray element failed to match the Swift Array Element type. Expected DetailedCell but found BasicCell

我的进度：

func scrollViewDidScroll(_ scrollView: UIScrollView) {
    // First (Detailed Cell)
    for newDetailedCell in mainCV.visibleCells as! [DetailedCell] { // Crashes on this line
        let indexPath = mainCV.indexPath(for: newDetailedCell)
        print("indexPath for Detailed Cell: \(indexPath)")
    }

    // Rest (Basic Cell)
    for basic in mainCV.visibleCells as! [BasicCell] {
        let indexPath = mainCV.indexPath(for: basic)
        print("indexPath for Basic Cell: \(indexPath)")
    }
}

如何使用两个不同的集合ViewCells访问visibleCells？您可以试试

for cell in mainCV.visibleCells {
   if let res = cell as? DetailedCell {
     //
   }
   else 
   if let res = cell as? BasicCell {
     //
   }
}  

或

---

要处理多个

UICollectionView

的滚动事件，请在

scrollViewDidScroll

中执行此条件：

func scrollViewDidScroll(_ scrollView: UIScrollView) {
    
    if scrollView == collectionView1 {
    
        // Your code goes here
        
    }

    if scrollView == collectionView2 {
    
        // Your code goes here
        
    }

}

func scrollViewDidScroll(_ scrollView: UIScrollView) {
    
    if scrollView == collectionView1 {
    
        // Your code goes here
        
    }

    if scrollView == collectionView2 {
    
        // Your code goes here
        
    }

}