Question

我在自定义CollectionView中尝试执行方法reloadData()时遇到问题。

当解析器结束工作时，我会重新加载数据。

这是执行reloadData时的代码：

override func viewDidLoad() {
    super.viewDidLoad()
    SomeStructure.numeroRow = 5
    self.collectionView.registerNib(UINib(nibName: "DateCollectionViewCell", bundle: nil), forCellWithReuseIdentifier: dateCellIdentifier)
    self.collectionView.registerNib(UINib(nibName: "ContentCollectionViewCell", bundle: nil), forCellWithReuseIdentifier: contentCellIdentifier)
    SomeStructure.numberRow = 200
    parser.delegate = self
    parser.parse {
        self.collectionView.collectionViewLayout.invalidateLayout()
        SomeStructure.numberRow = 190
        self.collectionView ? .reloadData()
    }
}

关于我在行更改大小时遇到问题，例如在此代码中我尝试加载200行的布局，并在重新加载200行布局之后。

错误是：

***断言失败 - [UICollectionViewData validateLayoutInRect：]，/ SourceCache / UIKit_Sim / UIKit-3318.16.14 / UICollectionViewData.m：417

由于未捕获的异常'NSInternalInconsistencyException'而终止应用程序，原因：'UICollectionView接收到索引路径不存在的单元格的布局属性：{length = 2，path = 190 - 0}'

修改

cellForItemAtIndexPath：

func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {

        if indexPath.section == 0 {
            if indexPath.row == 0 {

                let dateCell : DateCollectionViewCell = collectionView .dequeueReusableCellWithReuseIdentifier(dateCellIdentifier, forIndexPath: indexPath) as DateCollectionViewCell
                dateCell.backgroundColor = UIColor.whiteColor()
                dateCell.dateLabel.font = UIFont.systemFontOfSize(13)
                dateCell.dateLabel.textColor = UIColor.blackColor()
                dateCell.dateLabel.text = ""

                return dateCell
            } else {
                let contentCell : ContentCollectionViewCell = collectionView .dequeueReusableCellWithReuseIdentifier(contentCellIdentifier, forIndexPath: indexPath) as ContentCollectionViewCell
                contentCell.contentLabel.font = UIFont.systemFontOfSize(13)
                contentCell.contentLabel.textColor = UIColor.blackColor()
                contentCell.contentLabel.text = "200\(indexPath.row)"

                if indexPath.section % 2 != 0 {
                    contentCell.backgroundColor = UIColor(white: 242/255.0, alpha: 1.0)
                } else {
                    contentCell.backgroundColor = UIColor.whiteColor()
                }
                println("return content cell")
                return contentCell
            }
        } else {
            if indexPath.row == 0 {
                let dateCell : DateCollectionViewCell = collectionView .dequeueReusableCellWithReuseIdentifier(dateCellIdentifier, forIndexPath: indexPath) as DateCollectionViewCell
                dateCell.dateLabel.font = UIFont.systemFontOfSize(13)
                dateCell.dateLabel.textColor = UIColor.blackColor()
                dateCell.dateLabel.text = String("SeriesKey\nSeriesKey2")
                dateCell.dateLabel.numberOfLines = 2
                dateCell.dateLabel.lineBreakMode = .ByWordWrapping
                if indexPath.section % 2 != 0 {
                    dateCell.backgroundColor = UIColor(white: 242/255.0, alpha: 1.0)
                } else {
                    dateCell.backgroundColor = UIColor.whiteColor()
                }

                return dateCell
            } else {
                let contentCell : ContentCollectionViewCell = collectionView .dequeueReusableCellWithReuseIdentifier(contentCellIdentifier, forIndexPath: indexPath) as ContentCollectionViewCell
                contentCell.contentLabel.font = UIFont.systemFontOfSize(13)
                contentCell.contentLabel.textColor = UIColor.blackColor()
                contentCell.contentLabel.text = "\(indexPath.row)/\(indexPath.section)"
                if indexPath.section % 2 != 0 {
                    contentCell.backgroundColor = UIColor(white: 242/255.0, alpha: 1.0)
                } else {
                    contentCell.backgroundColor = UIColor.whiteColor()
                }

                return contentCell
            }
        }
    }

编辑2

Method layoutAttributesForElementsInRect: 

override func layoutAttributesForElementsInRect(rect: CGRect) -> [AnyObject]? {
    var attributes : NSMutableArray = NSMutableArray()
    for section in self.itemAttributes {
        attributes.addObjectsFromArray(
            section.filteredArrayUsingPredicate(
                NSPredicate(block: { (evaluatedObject, bindings) -> Bool in
                    return CGRectIntersectsRect(rect, evaluatedObject.frame)
                })
            )
        )
    }
    return attributes
}

由于

带有reloadData的CollectionView错误

0 个答案: