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更改数据源中的项数时UIcollection视图崩溃

uicollectionview swift ios

junaid · 技术社区 · 7 年前

 self.collectionView.delegate = self
        self.collectionView.dataSource = self
        self.collectionView.isPrefetchingEnabled = false

        self.collectionView.layer.shadowColor = UIColor.black.cgColor
        self.collectionView.layer.shadowOffset = CGSize(width: -1, height: 1)//CGSizeMake(0, 1)
        self.collectionView.layer.shadowOpacity = 0.5
        self.collectionView.layer.shadowRadius = 3.0
        self.collectionView.clipsToBounds = false
        self.collectionView.layer.masksToBounds = false

这就是我在didLoad中对collection视图所做的

现在的问题是当我设置数据源数组时

var myDataSource:[Custom Model] = []

当我更改myDataSourceArray时,它最初有10个值在更改之后这个数组现在只有1个值当我重新加载集合视图时它给出了这个。。。

*** Assertion failure in -[UICollectionViewData validateLayoutInRect:], /BuildRoot/Library/Caches/com.apple.xbs/Sources/UIKit_Sim/UIKit-3698.54.4/UICollectionViewData.m:435
2018-10-29 12:28:27.884302+0500 MyBetterDealsv2[14203:147469] Task <A3EE0E68-F980-47FD-A5B2-941C1D233A34>.<7> finished with error - code: -1001
2018-10-29 12:28:27.904908+0500 MyBetterDealsv2[14203:145748] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'UICollectionView received layout attributes for a cell with an index path that does not exist: <NSIndexPath: 0xc000000000200016> {length = 2, path = 0 - 1}'

我也尝试过使布局无效,但它给出了同样的错误,但还没有得到解决方案:(

下面是collectionview的委托方法

func numberOfSections(in collectionView: UICollectionView) -> Int {
    return 1
}
// tell the collection view how many cells to make
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
    if(self.myallDeals != nil && self.myallDeals?.count != 0){
        self.collectionViewHeightConstraint.constant = 220
    }
    return self.myallDeals?.count ?? 0

}

// make a cell for each cell index path
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {

    // get a reference to our storyboard cell
    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "dealCell", for: indexPath ) as! DealsCell
    let cellData = self.myallDeals?[indexPath.row]
    cell.dealTitle.text = cellData?.dealTitle
    cell.dealDescription.text = cellData?.dealLocation
    cell.discount.text = "$\(cellData?.discountedPrice ?? "") now"
    cell.dealDistanceLabel.text = "\(cellData?.distance ?? 0.0) km away"
    cell.ratingView.rating = cellData?.averageRating ?? 0.0

    cell.dealImage.sd_setImage(with: URL(string: cellData?.dealPicture ?? ""), placeholderImage: nil)
    if(cellData?.isliked == true){
        cell.likeButton.backgroundColor = UIColor(red: 251/255, green: 106/255, blue: 74/255, alpha: 1.0)
        cell.likeButton.setImage(UIImage(named: "liked"), for: .normal)
    }else{
         cell.likeButton.backgroundColor = UIColor(red:255, green: 255, blue:255, alpha: 1.0)
        cell.likeButton.setImage(UIImage(named: "heart"), for: .normal)
    }

    //===========================
    return cell
}


    func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
            // handle tap event
            if(Constants.isGuestUser){
                self.present(Utilities.SelectionButtonActionSheet(), animated: true, completion: nil)
            }else{
                let deal = self.myallDeals?[indexPath.row]
                //dealdetail
                let vc = self.storyboard?.instantiateViewController(withIdentifier: "dealdetail") as! DealDetailVC
                vc.mydeal = deal
                Utilities.animationOnPush(sender: self, nxtVC: vc)
                print("You selected cell.")
            }

        }

这是我用sateesh代码得到的

2 回复 | 直到 7 年前

V D Purohit Niki Trivedi 7 年前

我希望这对你有帮助

let layOut = UICollectionViewFlowLayout()
layOut.layout.scrollDirection = //.horizontal or .vertical
self.collectionView?.collectionViewLayout = layOut

extension yourViewController : UICollectionViewDelegateFlowLayout {

     func collectionView(_ collectionView: UICollectionView,
                layout collectionViewLayout: UICollectionViewLayout,
                sizeForItemAt indexPath: IndexPath) -> CGSize {
        // your code here
        //width and height as per your requirement
        return CGSize(width: self.view.frame,size.width - 24, height: height)
    }
}