致命错误：索引超出范围。快到评论了

Question

func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
    let cell=colView1.dequeueReusableCell(withReuseIdentifier:"cell",for: indexPath) as! MyCollectionViewCell
    cell.Image.image=UIImage (named: imagehome[indexPath.row])           //error
    if (collectionView==colView2){
        let cell = colView2.dequeueReusableCell(withReuseIdentifier:"cell1", for:indexPath) as! CollectionViewCell2
        cell.Image1.image = UIImage (named: imageHome2[indexPath.row])
        cell.Image1.layer.cornerRadius = cell.frame.height/2
        return cell
    }
    return cell
}

如何解决这个错误？

Answer 1

重写代码以获取不同的图像，具体取决于您为其提供单元格的集合视图：

func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
    // Change the line below to dequeue a cell from the collection view passed to the function. 
    //(Make sure you have a cell with the identifier "cell" defined for both collection views.)
    let cell = collectionView.dequeueReusableCell(withReuseIdentifier:"cell",for: indexPath) as! MyCollectionViewCell
    if (collectionView==colView2){
        let cell = colView2.dequeueReusableCell(withReuseIdentifier:"cell1", for:indexPath) as! CollectionViewCell2
        cell.Image1.image = UIImage (named: imageHome2[indexPath.row])
        cell.Image1.layer.cornerRadius = cell.frame.height/2
        return cell
    } else {
        // I moved this line into an else block for the other collection view (colView1?)
        cell.Image.image=UIImage (named: imagehome[indexPath.row])   
        // Do the other setup for a cell from colView1 here.        

    return cell
}

即使请求来自 colView2，您的代码也会尝试将单元格从 colView1 中出列。那是行不通的。