ios - Swift 3.0 中的 NSIndexPath 和 IndexPath

Question

我最近将我的代码转换为 Swift 3.0。我的 Collection View 和 TableView 数据源方法现在在其方法签名中包含 IndexPath 而不是 NSIndexPath。但仍然在方法定义中，它是将 IndexPath 类型转换为 NSIndexPath。即

func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell
    {
        let cell : NNAmenitiesOrFurnishingCollectionViewCell = self.amenitiesOrFurnishingCollectionView.dequeueReusableCell(withReuseIdentifier: "NNAmenitiesOrFurnishingCollectionViewCell", for: indexPath) as! NNAmenitiesOrFurnishingCollectionViewCell
        cell.facilityImageName = self.facilityArray[(indexPath as NSIndexPath).row].imageName
        cell.facilityLabelString = self.facilityArray[(indexPath as NSIndexPath).row].labelText
        return cell
    }

谁能告诉我为什么 indexPath 被类型转换为 NSIndexPath。

Answer 1

这里没有理由将 IndexPath 转换为 NSIndexPath。 Swift 3 覆盖类型 IndexPath 具有属性

/// The section of this index path, when used with `UITableView`.
///
/// - precondition: The index path must have exactly two elements.
public var section: Int

/// The row of this index path, when used with `UITableView`.
///
/// - precondition: The index path must have exactly two elements.
public var row: Int

您可以直接访问:

    cell.facilityImageName = self.facilityArray[indexPath.row].imageName
    cell.facilityLabelString = self.facilityArray[indexPath.row].labelText

显然，Xcode 迁移器的工作并不完美。