arrays - 将字符串复制到模型(Swift 3)

Question

我的 PhotoModel 没有为 eventDate() 返回任何内容..

我已经设置好了

let newPhotos = PhotosModel()  // Create the instance
newPhotos.eventDate = item.event_date!  // Set the parameter

在 didSelectItemAt 中，打印时返回前一个 View Controller 中的正确日期，但不会将其推送到 PhotoModel 字符串。

如果有人能为我指出正确的方向或展示需要做什么，那就太好了，谢谢。

View Controller :

override func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
    print(indexPath.row)
    
    // Configure the cell
    let item: CoverModel = feedItems[indexPath.row] as! CoverModel
    
    let Storyboard = UIStoryboard(name: "Main", bundle: nil)
    let DvC = Storyboard.instantiateViewController(withIdentifier: "DetailCollectionViewController") as! DetailCollectionViewController
    
    print(item.event_date!)
    
    let newPhotos = PhotosModel()  // Create the instance
    newPhotos.eventDate = item.event_date!  // Set the parameter
    
    print(newPhotos.eventDate)
    
    self.navigationController?.pushViewController(DvC, animated: true)
}

照片模型:

protocol PhotosProtocol: class {
    func itemsDownloaded(items: NSArray)
}

class PhotosModel: NSObject, URLSessionDataDelegate {
    //properties
    weak var delegate: PhotosProtocol!
    
    var eventDate = String()
    var data = Data()
    
    func downloadItems() {
        let urlPath: String = "http://www.britanniaclub.co.uk/app_calls/britalbum.php?eventdate=\(eventDate)"
        let url: URL = URL(string: urlPath)!
        print("the event date is \(eventDate)")
        print("the urlPath is \(urlPath)")
        
        let defaultSession = Foundation.URLSession(configuration: URLSessionConfiguration.default)
        
        let task = defaultSession.dataTask(with: url) { (data, response, error) in
            if error != nil {
                print("Failed to download data")
            }else {
                print("Event Data downloaded")
                self.parseJSON(data!)
            }
        }
        
        task.resume()
    }

输出是:

2017-07-14

the event date is

the urlPath is http://www.britanniaclub.co.uk/app_calls/britalbum.php?eventdate=

事件数据下载

Answer 1

我的猜测是您没有将 newPhotos 分配给 DetailCollectionViewController 的任何属性。在推送此 View Controller 之前，您必须这样做。