Question

我想从家庭控制器中的youtube上检索数据，然后将我的数据传递给我的视频控制器，但是该数据并未传输到我的视频控制器中。但是当我尝试打印数据时，数据就在家庭控制器中。这是我的代码

这是我放在家庭控制器类之上的协议

protocol VideoListDelegate: class {
    func didAddVideoItem(results: [SearchResult])
}

这是我的家庭控制器类中的实例委托

weak var delegate: VideoListDelegate?

这是我在家庭控制器中调用的api

private func youtubeAPI(with query: Method) {
    let request = SearchListRequest(part: [.id, .snippet], maxResults: 50, searchQuery: query.rawValue)

    ApiSession.shared.send(request) { (results) in
        if let err = results.error {
            print(" -- Failed to get data -- ")
            print(" -- \(err) -- ")
            return
        }

        if let result = results.value?.items {
            self.delegate?.didAddVideoItem(results: result)
        }

        let layout = UICollectionViewFlowLayout()
        let searchVideoController = VideoController(collectionViewLayout: layout)

        self.navigationController?.pushViewController(searchVideoController, animated: true)
    }
}

然后我使视频控制器符合协议

class VideoController: UICollectionViewController, UICollectionViewDelegateFlowLayout, VideoListDelegate {

// Add video into video array
func didAddVideoItem(results: [SearchResult]) {
    for item in results {
        print(item.snippet.title)

        let video = Video(title: item.snippet.title, videoId: item.id.videoID ?? "")
        self.videos.append(video)
    }

    DispatchQueue.main.async {
        self.collectionView.reloadData()
    }
  }
}

Answer 1

您的API方法应该是这样，那么您就不需要委派来传递数据：

private func youtubeAPI(with query: Method) {
    let request = SearchListRequest(part: [.id, .snippet], maxResults: 50, searchQuery: query.rawValue)

    ApiSession.shared.send(request) { (results) in
        if let err = results.error {
            print(" -- Failed to get data -- ")
            print(" -- \(err) -- ")
            return
        }

        let layout = UICollectionViewFlowLayout()
        let searchVideoController = VideoController(collectionViewLayout: layout)
        searchVideoController.results = results.value?.items ?? []
        self.navigationController?.pushViewController(searchVideoController, animated: true)
    }
}

然后在您的VideoViewController中添加一个类型为results的变量[SearchResult]。

来自YouTube的数据未使用委托传递

1 个答案: