Question

我创建了一个表格视图（Xcode 11，Swift 5），在其中放置了集合视图，还创建了一个图像数组：

let badgesImages: [UIImage] = [

    UIImage(named: "Plastic Bottle Challenge bronze")!,
    UIImage(named: "Plastic Bottle Challenge silver")!,
    UIImage(named: "Plastic Bottle Challenge gold")!,
    UIImage(named: "Car Challenge bronze")!,
    UIImage(named: "Car Challenge silver")!,
    UIImage(named: "Car Challenge gold")!,

]

在这里被召回：

func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "CollectionViewCell", for: indexPath) as! CollectionViewCell
        cell.badgesImageView.image = badgesImages[indexPath.item]


    return cell
}

我需要从阵列中选择三张图像来填充表格视图的一个单元格，并且需要为每个单元格重复该过程。我怎样才能做到这一点？预先感谢！

Answer 1

import Foundation

let badgesImages = [
    "Plastic Bottle Challenge bronze",
    "Plastic Bottle Challenge silver",
    "Plastic Bottle Challenge gold",
    "Car Challenge bronze",
    "Car Challenge silver",
    "Car Challenge gold"
]

extension Array {
       func pick(_ n: Int) -> [Element] {
         guard count >= n else {
             fatalError("The count has to be at least \(n)")
         }
         guard n >= 0 else {
             fatalError("The number of elements to be picked must be positive")
         }

         let shuffledIndices = indices.shuffled().prefix(upTo: n)
         return shuffledIndices.map {self[$0]}
     }
}

badgesImages.pick(3)

Example Referance

如何选择要在表格视图中显示的某些图像

1 个答案: