Question

运行OS X El Cap dev beta，iOS 9.0，Xcode 7.0 GM

我正在关注这个Ray Wenderlich教程（http://www.raywenderlich.com/85080/beginning-alamofire-tutorial），我真的遇到了一些问题。在我创建请求路由器之前，我的应用程序不起作用。它正确构建，然后一旦开始加载，我得到标题中写的调试器短语。构建错误描述是“线程1：信号SIGABRT”。

概述的行是：

let imageURL = (photos.objectAtIndex(indexPath.row) as! PhotoInfo).url

这是PhotoBrowserCollectionViewController.swift文件的完整代码。

//
//  PhotoBrowserCollectionViewController.swift
//  Photomania
//
//  Created by Essan Parto on 2014-08-20.
//  Copyright (c) 2014 Essan Parto. All rights reserved.
//

import UIKit
import Alamofire

class PhotoBrowserCollectionViewController: UICollectionViewController, UICollectionViewDelegateFlowLayout {
  var photos = NSMutableOrderedSet()

  let refreshControl = UIRefreshControl()

  let PhotoBrowserCellIdentifier = "PhotoBrowserCell"
  let PhotoBrowserFooterViewIdentifier = "PhotoBrowserFooterView"

  // MARK: Life-cycle

  override func viewDidLoad() {
    super.viewDidLoad()

    setupView()

//    Alamofire.request(.GET, "https://api.500px.com/v1/photos").responseJSON() {
//        (_, _, data) in
//        print(data.value)}

    Alamofire.request(.GET, "https://api.500px.com/v1/photos", parameters: ["consumer_key": "consumer key"]).responseJSON() {
        (_,_,JSON) in
        print(JSON.value)

        let photoInfos = (JSON.value!.valueForKey("photos") as! [NSDictionary]).filter({
            ($0["nsfw"] as! Bool) == false
        }).map {
            PhotoInfo(id: $0["id"] as! Int, url: $0["image_url"] as! String)
        }

        self.photos.addObject(photoInfos)
        print(self.photos)

        self.collectionView?.reloadData()
        }
    }


  override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
  }

  // MARK: CollectionView

  override func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
    return photos.count
  }

  override func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
    let cell = collectionView.dequeueReusableCellWithReuseIdentifier(PhotoBrowserCellIdentifier, forIndexPath: indexPath) as! PhotoBrowserCollectionViewCell

    let imageURL = (photos.objectAtIndex(indexPath.row) as! PhotoInfo).url

    Alamofire.request(.GET, imageURL).response() {
        (_,_, data, _) in

        let image = UIImage(data: data!)
        cell.imageView.image = image
    }

    return cell
  }

  override func collectionView(collectionView: UICollectionView, viewForSupplementaryElementOfKind kind: String, atIndexPath indexPath: NSIndexPath) -> UICollectionReusableView {
    return collectionView.dequeueReusableSupplementaryViewOfKind(kind, withReuseIdentifier: PhotoBrowserFooterViewIdentifier, forIndexPath: indexPath) 
  }

  override func collectionView(collectionView: UICollectionView, didSelectItemAtIndexPath indexPath: NSIndexPath) {
    performSegueWithIdentifier("ShowPhoto", sender: (self.photos.objectAtIndex(indexPath.item) as! PhotoInfo).id)
  }

  // MARK: Helper

  func setupView() {
    navigationController?.setNavigationBarHidden(false, animated: true)

    let layout = UICollectionViewFlowLayout()
    let itemWidth = (view.bounds.size.width - 2) / 3
    layout.itemSize = CGSize(width: itemWidth, height: itemWidth)
    layout.minimumInteritemSpacing = 1.0
    layout.minimumLineSpacing = 1.0
    layout.footerReferenceSize = CGSize(width: collectionView!.bounds.size.width, height: 100.0)

    collectionView!.collectionViewLayout = layout

    navigationItem.title = "Featured"

    collectionView!.registerClass(PhotoBrowserCollectionViewCell.classForCoder(), forCellWithReuseIdentifier: PhotoBrowserCellIdentifier)
    collectionView!.registerClass(PhotoBrowserCollectionViewLoadingCell.classForCoder(), forSupplementaryViewOfKind: UICollectionElementKindSectionFooter, withReuseIdentifier: PhotoBrowserFooterViewIdentifier)

    refreshControl.tintColor = UIColor.whiteColor()
    refreshControl.addTarget(self, action: "handleRefresh", forControlEvents: .ValueChanged)
    collectionView!.addSubview(refreshControl)
  }

  override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
    if segue.identifier == "ShowPhoto" {
      (segue.destinationViewController as! PhotoViewerViewController).photoID = sender!.integerValue
      (segue.destinationViewController as! PhotoViewerViewController).hidesBottomBarWhenPushed = true
    }
  }

  func handleRefresh() {

  }
}

class PhotoBrowserCollectionViewCell: UICollectionViewCell {
  let imageView = UIImageView()

  required init?(coder aDecoder: NSCoder) {
    super.init(coder: aDecoder)
  }

  override init(frame: CGRect) {
    super.init(frame: frame)

    backgroundColor = UIColor(white: 0.1, alpha: 1.0)

    imageView.frame = bounds
    addSubview(imageView)
  }
}

class PhotoBrowserCollectionViewLoadingCell: UICollectionReusableView {
  let spinner = UIActivityIndicatorView(activityIndicatorStyle: UIActivityIndicatorViewStyle.WhiteLarge)

  required init?(coder aDecoder: NSCoder) {
    super.init(coder: aDecoder)
  }

  override init(frame: CGRect) {
    super.init(frame: frame)

    spinner.startAnimating()
    spinner.center = self.center
    addSubview(spinner)
  }
}

Answer 1

这是因为您使用

添加完整数组photoInfos

self.photos.addObject(photoInfos)

而你应该做

self.photos.addObjectsFromArray(photoInfos)

这会将photoInfos中的数组元素逐个添加，而不是将整个photoInfos数组添加到photos的索引1

Answer 2

我也学习本教程并遇到一些问题。首先，由于与500px.com服务器的网络连接不稳定，我从JSON数据中得到nil，因此照片计数为0，因此我无法在UI中看到任何单元格;第二，我的Xcode版本是7.2和Swift 2.0，所以我发现我的环境发生了一些变化。如果您完全遵循本教程，您将获得一些编码例外。

self.photos.addObject(photoInfos)

您应该使用函数addObjectForArray(ARRAY_NAME)而不是addObject()。

我不知道天气你的Xcode和Swift的版本对我来说是一样的。我觉得编码有很多变化。所以在关于函数＆＃34;响应＆＃34;的关闭中，我这样写：

let request = Alamofire.request(.GET, urlString, parameters: [CONSUMER_KEY : CONSUMER_KEY_VALUE])
request.responseJSON{ response in let json = response.result.value ... }

var data:NSData!
        let request = Alamofire.request(.GET, (photoMuatbleOrderedSet.objectAtIndex(indexPath.row) as! Photo).image_url!)
        request.responseData { (response) -> Void in
           data = response.data!
            let image = UIImage(data: data)
            cell.imageView.image = image
        }
        return cell

随着这些变化，当应用程序运行时，我没有例外！

Alamofire与Swift - “无法将类型'Swift._SwiftDeferredNSArray'（ox10a75ebb0）的值转换为'Photomania.PhotoInfo'（0x107ee7b90）。”

2 个答案: