程序崩溃没有加载集合视图

时间：2018-03-26 10:20:27

标签： ios swift uicollectionview

我有登录按钮，该按钮指向主页集合视图。加载主页集合视图时程序崩溃。这是主页集合视图的代码。

class CollectionViewController: UIViewController ,UICollectionViewDelegate,UICollectionViewDataSource,UISearchControllerDelegate, UISearchBarDelegate, UISearchResultsUpdating{

    var items = [Food]()
    var filtered = [Food]()
    var searchActive : Bool = false
    let searchController = UISearchController(searchResultsController: nil)

    // var items = ["ASIAN","SEAFOOD","SUSHI","CAFE","Los Angeles","Austin","Seattle"]


    @IBOutlet var collectionViewController: UICollectionView!
    override func viewDidLoad() {
        super.viewDidLoad()
        // imageViewArray=[#imageLiteral(resourceName: "food18") ,#imageLiteral(resourceName: "food19"),#imageLiteral(resourceName: "food20"),#imageLiteral(resourceName: "food21"),#imageLiteral(resourceName: "food22"),#imageLiteral(resourceName: "food23"),#imageLiteral(resourceName: "food24")]

        self.items.append(Food(title: "View Appointment",    image: UIImage(named: "view appointments@1x.png")))
        self.items.append(Food(title: "Medical Chart",  image:UIImage(named: "medical chart@1x.png")))
        self.items.append(Food(title: "Task",    image:UIImage(named: "tasks@2x.png")))
        self.items.append(Food(title: "Referrals",     image:UIImage(named: "referrals@2x.png")))
        self.items.append(Food(title: "Profile", image:UIImage(named: "profile@2x.png")))
        self.items.append(Food(title: "Wallet",   image:UIImage(named: "wallet@2x.png")))

        collectionViewController.dataSource=self
        collectionViewController.delegate=self

        self.searchController.searchResultsUpdater = self
        self.searchController.delegate = self
        self.searchController.searchBar.delegate = self

        self.searchController.hidesNavigationBarDuringPresentation = false
        self.searchController.dimsBackgroundDuringPresentation = true
        self.searchController.obscuresBackgroundDuringPresentation = false
        searchController.searchBar.placeholder = "Search for tools and resources"
        searchController.searchBar.sizeToFit()

        searchController.searchBar.becomeFirstResponder()

        self.navigationItem.titleView = searchController.searchBar



        // Do any additional setup after loading the view, typically from a nib.
    }
    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {

        if searchActive {
            return filtered.count
        }
        else
        {
            return items.count    //return number of rows in section
        }
    }

    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {

        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cell", for: indexPath) as! CategoriesCollectionViewCell

        //configureCell(cell: cell as! toolCollectionViewCell, forItemAtIndexPath: indexPath as NSIndexPath)
        cell.imageViewCell=cell.viewWithTag(1) as! UIImageView
        if searchActive {
            cell.imageViewCell.image = self.filtered[indexPath.row].image
            cell.categoriesTitleLbl.text =  self.filtered[indexPath.row].title
        } else {
            cell.imageViewCell.image = self.items[indexPath.row].image
            cell.categoriesTitleLbl.text =  self.items[indexPath.row].title
        }
        return cell      //return your cell
    }

    func searchBarCancelButtonClicked(_ searchBar: UISearchBar) {
        searchActive = false
        self.dismiss(animated: true, completion: nil)
    }

    func updateSearchResults(for searchController: UISearchController)
    {
        guard let searchString = searchController.searchBar.text else {
            return
        }

        filtered = items.filter({ (item) -> Bool in
            if let title = item.title {
                return title.lowercased().contains(searchString.lowercased())
            } else {
                return false
            }
        })

        collectionViewController.reloadData()
    }

    func searchBarTextDidBeginEditing(_ searchBar: UISearchBar) {
        searchActive = true
        collectionViewController.reloadData()
    }


    func searchBarSearchButtonClicked(_ searchBar: UISearchBar) {
        searchActive = false
        collectionViewController.reloadData()
    }

    func searchBarBookmarkButtonClicked(_ searchBar: UISearchBar) {
        if !searchActive {
            searchActive = true
            collectionViewController.reloadData()
        }

        searchController.searchBar.resignFirstResponder()
    }





}
class Food {
    var title: String?
    var image: UIImage?

    init(title: String?, image: UIImage?) {
        self.title = title
        self.image = image
    }
}

这是集合视图单元格的代码

class CategoriesCollectionViewCell: UICollectionViewCell {

    @IBOutlet weak var imageViewCell: UIImageView!
    @IBOutlet weak var categoriesTitleLbl: UILabel!
}

如何避免此程序崩溃。并成功加载主页。 您可以从此链接下载项目。https://drive.google.com/file/d/1HPoFPdTOeKKpMEc_zdLGCGpjmgXe0HRb/view?usp=sharing 错误陈述是

*** Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<UICollectionViewController 0x7f951651a340> setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key collectionViewController.'
*** First throw call stack:
(
    0   CoreFoundation                      0x000000010a3c212b __exceptionPreprocess + 171
    1   libobjc.A.dylib                     0x0000000109a56f41 objc_exception_throw + 48
    2   CoreFoundation                      0x000000010a3c2079 -[NSException raise] + 9
    3   Foundation                          0x0000000109475a63 -[NSObject(NSKeyValueCoding) setValue:forKey:] + 292
    4   UIKit                               0x000000010ac7f117 -[UIViewController setValue:forKey:] + 87
    5   UIKit                               0x000000010af70c2d -[UIRuntimeOutletConnection connect] + 109
    6   CoreFoundation                      0x000000010a3653cd -[NSArray makeObjectsPerformSelector:] + 317
    7   UIKit                               0x000000010af6f5e3 -[UINib instantiateWithOwner:options:] + 1856
    8   UIKit                               0x000000010ac863ff -[UIViewController _loadViewFromNibNamed:bundle:] + 383
    9   UIKit                               0x000000010ac86d2b -[UIViewController loadView] + 177
    10  UIKit                               0x000000010b5f6304 -[UICollectionViewController loadView] + 290
    11  UIKit                               0x000000010ac8705c -[UIViewController loadViewIfRequired] + 195
    12  UIKit                               0x000000010ac878b9 -[UIViewController view] + 27
    13  UIKit                               0x000000010b720441 -[_UIFullscreenPresentationController _setPresentedViewController:] + 89
    14  UIKit                               0x000000010ac542a3 -[UIPresentationController initWithPresentedViewController:presentingViewController:] + 133
    15  UIKit                               0x000000010ac9ab67 -[UIViewController _presentViewController:withAnimationController:completion:] + 3808
    16  UIKit                               0x000000010ac9d9a9 __63-[UIViewController _presentViewController:animated:completion:]_block_invoke + 99
    17  UIKit                               0x000000010ac9e079 -[UIViewController _performCoordinatedPresentOrDismiss:animated:] + 532
    18  UIKit                               0x000000010ac9d908 -[UIViewController _presentViewController:animated:completion:] + 181
    19  UIKit                               0x000000010ac9dc67 -[UIViewController presentViewController:animated:completion:] + 159
    20  UIKit                               0x000000010aca2fea -[UIViewController _showViewController:withAction:sender:] + 274
    21  UIKit                               0x000000010b24fe9a __66-[UIStoryboardShowSegueTemplate newDefaultPerformHandlerForSegue:]_block_invoke + 134
    22  UIKit                               0x000000010b40fc1e -[UIStoryboardSegueTemplate _performWithDestinationViewController:sender:] + 279
    23  UIKit                               0x000000010b40fad6 -[UIStoryboardSegueTemplate _perform:] + 82
    24  UIKit                               0x000000010b40fd9e -[UIStoryboardSegueTemplate perform:] + 157
    25  UIKit                               0x000000010aae0972 -[UIApplication sendAction:to:from:forEvent:] + 83
    26  UIKit                               0x000000010ac5fc3c -[UIControl sendAction:to:forEvent:] + 67
    27  UIKit                               0x000000010ac5ff59 -[UIControl _sendActionsForEvents:withEvent:] + 450
    28  UIKit                               0x000000010ac5ee86 -[UIControl touchesEnded:withEvent:] + 618
    29  UIKit                               0x000000010ab56807 -[UIWindow _sendTouchesForEvent:] + 2807
    30  UIKit                               0x000000010ab57f2a -[UIWindow sendEvent:] + 4124
    31  UIKit                               0x000000010aafb365 -[UIApplication sendEvent:] + 352
    32  UIKit                               0x000000010b447a1d __dispatchPreprocessedEventFromEventQueue + 2809
    33  UIKit                               0x000000010b44a672 __handleEventQueueInternal + 5957
    34  CoreFoundation                      0x000000010a365101 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
    35  CoreFoundation                      0x000000010a404f71 __CFRunLoopDoSource0 + 81
    36  CoreFoundation                      0x000000010a349a6b __CFRunLoopDoSources0 + 267
    37  CoreFoundation                      0x000000010a348fff __CFRunLoopRun + 1279
    38  CoreFoundation                      0x000000010a348889 CFRunLoopRunSpecific + 409
    39  GraphicsServices                    0x00000001129509c6 GSEventRunModal + 62
    40  UIKit                               0x000000010aadf5d6 UIApplicationMain + 159
    41  WowPatient                          0x0000000108f70b47 main + 55
    42  libdyld.dylib                       0x000000010eb87d81 start + 1
    43  ???                                 0x0000000000000001 0x0 + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException

3 个答案:

答案 0 :(得分：0)

CollectionViewController

中有多处错误

首先，该类继承自UIViewController，但您的故事板上有一个UICollectionViewController，修改CollectionViewController.swift文件以继承UICollectionViewController，如下所示：

class CollectionViewController: UICollectionViewController, UISearchControllerDelegate, UISearchBarDelegate, UISearchResultsUpdating

在这两个方法的开头添加override关键字：

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

func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell

编辑故事板并删除连接检查器中的委托和数据源引用，同时删除IBOutlet引用

现在已从故事板中删除IBOutlet，并将其从类中删除

  

@IBOutlet var collectionViewController：UICollectionView！

现在，如果您想访问UICollectionView，请使用self.collectionView代替self.collectionViewController，如下所示：

self.collectionView?.reloadData()
self.collectionView?.dataSource = self
self.collectionView?.delegate = self

更新，在class CategoriesCollectionViewCell

中添加 
override func awakeFromNib() {
    super.awakeFromNib()
    self.contentView.backgroundColor = .black
}

答案 1 :(得分：0)

在numberOfItemsInSection之前添加numberOfSections方法。

答案 2 :(得分：0)

Problem was here in both adding CollectionViewController and CategoriesCollectionViewCell

点击Inherit Module From Target。添加CollectionViewController和CategoriesCollectionViewCell

都存在问题

并将collectionViewController重命名为collectionView

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