问题描述
我最近将我的代码转换为Swift 3.0。我的集合视图和表视图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，它是对NSIndexPath的类型转换IndexPath。即。
I have recently converted my code to Swift 3.0. My collection view and table view data source methods now contain IndexPath instead of NSIndexPath in their method signature. But still inside the method definition it is type casting IndexPath to NSIndexPath. i.e.
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
}
任何人都可以告诉我为什么 indexPath 类型已转换为 NSIndexPath 。
Can anyone tell me why indexPath is type casted to NSIndexPath.
推荐答案
有没有理由在这里将 IndexPath 强制转换为 NSIndexPath 。
Swift 3叠加类型 IndexPath 有属性
There is no reason to cast IndexPath to NSIndexPath here.The Swift 3 overlay type IndexPath has properties
/// 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迁移器并不是一个完美的工作。
Apparently the Xcode migrator did not a perfect job.
这篇关于Swift 3.0中的NSIndexPath和IndexPath的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！