ios - View Controller 中的嵌入式 UICollectionView 未被调用 Swift

Question

由于某些奇怪的原因，未调用 collectionView。我在 numberOfItemsInSection 和 cellForItemAtIndexPath 处放置了断点，但它们从未被调用过。这是我的代码:

class ChannelViewController: UIViewController, UISearchResultsUpdating, UICollectionViewDataSource, UICollectionViewDelegate {

  var channelArray: [ChannelInfo] = []
  var filteredSearchResults = [ChannelInfo]()
  var resultsSearchController = UISearchController(searchResultsController: nil)
  var logosShown = [Bool](count: 50, repeatedValue: false)
  var detailUrl: String?
  var apiKey = ""
  var channel: String!
  var channelForShow: String!
  var task: NSURLSessionTask?

  @IBOutlet var channelCollectionView: UICollectionView!

  override func viewDidLoad() {

    let baseURL = ""
    getJSON(baseURL)
  }


  //MARK: CollectionView

 func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {

    if resultsSearchController.active && resultsSearchController.searchBar.text != ""
    {
      return filteredSearchResults.count
    } else {
      return channelArray.count
    }
  }


 func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
      let cell = collectionView.dequeueReusableCellWithReuseIdentifier("ChannelCell", forIndexPath: indexPath) as! ChannelCell
    let channel: String
    if resultsSearchController.active && resultsSearchController.searchBar.text != "" {
      channel = self.filteredSearchResults[indexPath.row].logo
    } else {
      channel = self.channelArray[indexPath.row].logo
    }
    return cell
  }

func collectionView(collectionView: UICollectionView, didSelectItemAtIndexPath indexPath: NSIndexPath) {

    var replacedTitle: String?
    if resultsSearchController.active && resultsSearchController.searchBar.text != "" {

      channelForShow = filteredSearchResults[indexPath.row].channelName

      }
    } else {
      channelForShow = self.channelArray[indexPath.row].channelName
      }
    }
    self.dismissSearchBar()
    performSegueWithIdentifier("channelCollectToShowSegue", sender: self)
  }

我还有一个为 collectionView Cell 子类化的单元格:

class ChannelCell : UICollectionViewCell {

  @IBOutlet var channelImageView: UIImageView!

}

Answer 1

您需要将 Collection View 的数据源设置为 Controller 。

1) 在界面构建器中，只需从 Collection View 拖动到 Controller 。并选择委托(delegate)和数据源..

2) 程序化

override func viewDidLoad() {
    super.viewDidLoad()

    channelCollectionView.delegate = self
    channelCollectionView.dataSource = self

   let baseURL = ""
    getJSON(baseURL)
  }