Swift 工具栏按钮仅在一个场景中触发 exec_bad_instruction

Posted 2023-03-29

【中文标题】Swift 工具栏按钮仅在一个场景中触发 exec_bad_instruction

【英文标题】：Swift Toolbar button triggers a exec_bad_instruction only on one scene

【发布时间】：2018-11-30 02:29:20

【问题描述】：

我正在更改我的应用程序以开始在主页上使用工具栏按钮而不是菜单。所有菜单链接都有效，工具栏按钮在除一个之外的每一页上都有效。当我单击按钮时，应用程序冻结，Xcode 将我带到这一行： '弱 var itemDetailPage = segue.destination as? ItemDetailViewController' 出现此错误： 线程 1：EXC_BAD_INSTRUCTION（代码=EXC_I386_INVOP，子代码=0x0） 所有变量都为零。

任何帮助都将是巨大的！

下面是视图控制器的代码：

import UIKit
import AVFoundation
import Alamofire


@objc protocol FavRefreshLikeCountsDelegate: class 
    func updateLikeCounts(_ likeCount: Int)


@objc protocol FavRefreshReviewCountsDelegate: class 
    func updateReviewCounts(_ reviewCount: Int)


class FavouriteItemsViewController: UICollectionViewController 

    var populationItems = false
    var selectedSubCategoryId:Int = 0
    var selectedCityId:Int = 1
    var selectedCityLat: String!
    var selectedCityLng: String!
    var items = [ItemModel]()
    var currentPage = 0
    var loginUserId:Int = 0
    weak var selectedCell : AnnotatedPhotoCell!

    @IBOutlet weak var menuButton: UIBarButtonItem!
    var defaultValue: CGPoint!


    override func viewDidLoad() 
        if self.revealViewController() != nil 
            menuButton.target = self.revealViewController()
            menuButton.action = #selector(SWRevealViewController.revealToggle(_:))
            self.view.addGestureRecognizer(self.revealViewController().panGestureRecognizer())

        

        collectionView!.register(AnnotatedPhotoCell.classForCoder(), forSupplementaryViewOfKind: UICollectionElementKindSectionFooter, withReuseIdentifier: "AnnotatedPhotoCell")

        if let layout = collectionView?.collectionViewLayout as? PinterestLayout 
            layout.delegate = self
        
        loadLoginUserId()
        loadFavouriteItems()

        defaultValue = collectionView?.frame.origin
        animateCollectionView()
    

    override func viewDidAppear(_ animated: Bool) 
        updateNavigationStuff()
    

    override var preferredStatusBarStyle : UIStatusBarStyle 
        return UIStatusBarStyle.lightContent
    


    override func scrollViewWillBeginDragging(_ scrollView: UIScrollView) 
        loadFavouriteItems()
    

    override func prepare(for segue: UIStoryboardSegue, sender: Any?) 


        weak var itemCell = sender as? AnnotatedPhotoCell
        weak var itemDetailPage = segue.destination as? ItemDetailViewController
        itemDetailPage!.selectedItemId = Int((itemCell!.item?.itemId)!)!
        itemDetailPage!.selectedShopId = Int((itemCell!.item?.itemShopId)!)!
        itemDetailPage!.favRefreshLikeCountsDelegate = self
        itemDetailPage!.favRefreshReviewCountsDelegate = self
        selectedCell = itemCell
        updateBackButton()

    

    override func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int 
        return items.count
    

    override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell 
        var cell : AnnotatedPhotoCell

        cell = collectionView.dequeueReusableCell(withReuseIdentifier: "AnnotatedPhotoCell", for: indexPath) as! AnnotatedPhotoCell
        cell.item = items[(indexPath as NSIndexPath).item]

        let imageURL = configs.imageUrl + items[(indexPath as NSIndexPath).item].itemImage

        cell.imageView?.loadImage(urlString: imageURL)   (status, url, image, msg) in
            if(status == STATUS.success) 
                print(url + " is loaded successfully.")
                self.items[indexPath.item].itemImageBlob = image
            else 
                print("Error in loading image" + msg)
            
        

        cell.imageView.alpha = 0
        cell.captionLabel.alpha = 0

        UIView.animate(withDuration: 1, delay: 0, options: UIViewAnimationOptions.curveEaseIn, animations: 
            cell.imageView.alpha = 1.0
            cell.captionLabel.alpha = 1.0
        , completion: nil)

        return cell

    


    func updateBackButton() 
        let backItem = UIBarButtonItem()
        backItem.title = ""
        navigationItem.backBarButtonItem = backItem
    

    func updateNavigationStuff() 
        self.navigationController?.navigationBar.topItem?.title = language.favouritePageTitle
        self.navigationController?.navigationBar.titleTextAttributes = [ NSAttributedStringKey.font: UIFont(name: customFont.boldFontName, size: CGFloat(customFont.boldFontSize))!,  NSAttributedStringKey.foregroundColor:UIColor.white]
        self.navigationController!.navigationBar.barTintColor = Common.instance.colorWithHexString(configs.barColorCode)
    

    func loadLoginUserId() 
        let plistPath = Common.instance.getLoginUserInfoPlist()

        let myDict = NSDictionary(contentsOfFile: plistPath)
        if let dict = myDict 
            loginUserId           = Int(dict.object(forKey: "_login_user_id") as! String)!

            print("Login User Id : " + String(loginUserId))
         else 
            print("WARNING: Couldn't create dictionary from LoginUserInfo.plist! Default values will be used!")
        
    

    func loadFavouriteItems() 
        if self.currentPage == 0 
            _ = EZLoadingActivity.show("Loading...", disableUI: true)
        
        Alamofire.request(APIRouters.GetFavouriteItems( loginUserId, configs.pageSize, self.currentPage)).responseCollection 
            (response: DataResponse<[Item]>) in

            if self.currentPage == 0 
                _ = EZLoadingActivity.hide()
            

            if response.result.isSuccess 
                if let items: [Item] = response.result.value 
                    if(items.count > 0) 
                        for item in items 
                            let oneItem = ItemModel(item: item)
                            self.items.append(oneItem)
                            self.currentPage+=1

                        
                    
                

                self.collectionView!.reloadData()

             else 
                print(response)
            
        

    

    func animateCollectionView() 

        moveOffScreen()

        UIView.animate(withDuration: 1, delay: 0,
                       usingSpringWithDamping: 0.9,
                       initialSpringVelocity: 0.9, options: UIViewAnimationOptions.curveEaseOut, animations: 
                        self.collectionView?.frame.origin = self.defaultValue
        , completion: nil)
    

    fileprivate func moveOffScreen() 
        collectionView?.frame.origin = CGPoint(x: (collectionView?.frame.origin.x)!,
                                               y: (collectionView?.frame.origin.y)! + UIScreen.main.bounds.size.height)
    




extension FavouriteItemsViewController : PinterestLayoutDelegate 
    func collectionView(_ collectionView:UICollectionView, heightForPhotoAtIndexPath indexPath:IndexPath , withWidth width:CGFloat) -> CGFloat 

        let item = items[(indexPath as NSIndexPath).item]

        let boundingRect =  CGRect(x: 0, y: 0, width: width, height: CGFloat(MAXFLOAT))

        let size = CGSize(width: item.itemImageWidth, height: item.itemImageHeight)
        var rect : CGRect
        if item.itemImageBlob != nil 
            rect  = AVMakeRect(aspectRatio: item.itemImageBlob!.size, insideRect: boundingRect)
        else
            rect  = AVMakeRect(aspectRatio: size, insideRect: boundingRect)

        

        return rect.size.height
    

    func collectionView(_ collectionView: UICollectionView, heightForAnnotationAtIndexPath indexPath: IndexPath, withWidth width: CGFloat) -> CGFloat 
        let annotationPadding = CGFloat(4)
        let annotationHeaderHeight = CGFloat(17)
        let height = annotationPadding + annotationHeaderHeight + annotationPadding + 30
        return height
    


extension FavouriteItemsViewController : FavRefreshLikeCountsDelegate, FavRefreshReviewCountsDelegate 
    func updateLikeCounts(_ likeCount: Int) 
        if selectedCell != nil 
            selectedCell.lblLikeCount.text = "\(likeCount)"
        
    

    func updateReviewCounts(_ reviewCount: Int) 
        if selectedCell != nil 
            selectedCell.lblReviewCount.text = "\(reviewCount)"
        
    

【参考方案1】：

您应该尝试检查您的 ItemDetailViewController。 例如：

if segue.identifier == "ItemDetailVC" 
    weak var itemCell = sender as? AnnotatedPhotoCell
    weak var itemDetailPage = segue.destination as? ItemDetailViewController
    ...

【讨论】：

我相信这就是问题所在。我的工具栏与项目无关，但每次我单击一个舔它都会将其注册为一个项目。我还有一个菜单按钮，它没有注册为项目。