ios - 当单元格插入表格时，自定义表格 View 单元格内的 ImageView 消失

Question

这是我第一次接触 iOS 开发。我正在创建一个应用程序，它使用自定义 UITableViewCell 来显示从 Core Data 检索到的信息。我遇到这个问题，当单元格插入表格时，显示颜色的 imageView 随机消失。如果 ImageView 确实消失了，关闭应用程序并重新启动将解决问题。

插入表后:pic强制关闭应用程序并重新启动后:pic

任何关于问题所在的建议都将不胜感激。

这里是一些相关的代码。如果有帮助，我也在使用 NSFetchedResultsController。

override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> CustomTableViewCell {
    let cell = self.tableView.dequeueReusableCellWithIdentifier("Cell") as! CustomTableViewCell
    let object = self.fetchedResultsController.objectAtIndexPath(indexPath) as! NSManagedObject
    self.configureCell(cell, withObject: object)

    return cell
}

func configureCell(cell: CustomTableViewCell, withObject object: NSManagedObject) {

    let imageData: NSData = object.valueForKey("image") as! NSData
    let colorImageBlank: UIImage = UIImage(named: "blank.png")!
    let picture: UIImage = UIImage(data: imageData)!
    let date: NSDate
    let dateFormatter = NSDateFormatter()
    dateFormatter.locale = NSLocale.currentLocale()

    cell.cellImage.image = picture

    let colorString = object.valueForKey("color")!.description
    var color: UIColor = UIColor()
    if colorString == "Blue" {
        color = UIColor.blueColor()
    } else if colorString == "Red" {
        color = UIColor.redColor()
    } else if colorString == "Green" {
        color = UIColor.greenColor()
    } else if colorString == "Yellow" {
        color = UIColor.yellowColor()
    } else if colorString == "Orange" {
        color = UIColor.orangeColor()
    } else if colorString == "Purple" {
        color = UIColor.purpleColor()
    }

    cell.colorImage.image = colorImageBlank
    cell.colorImage.backgroundColor = color
    cell.colorImage.layer.cornerRadius = 5.0

    cell.cellImage.layer.borderWidth = 2
    cell.cellImage.layer.borderColor = color.CGColor
    cell.cellImage.layer.cornerRadius = 5.0


    cell.locationNameLabel.text = object.valueForKey("name")!.description
    cell.locationNameLabel.font = UIFont.boldSystemFontOfSize(14.0)
    cell.locationNameLabel.lineBreakMode = NSLineBreakMode.ByTruncatingTail

    cell.categoryLabel.text = object.valueForKey("category")!.description
    cell.categoryLabel.font = UIFont.italicSystemFontOfSize(12.0)
    cell.categoryLabel.lineBreakMode = NSLineBreakMode.ByTruncatingTail

    date = object.valueForKey("date")! as! NSDate

    dateFormatter.dateStyle = NSDateFormatterStyle.ShortStyle
    cell.dateLabel.text = dateFormatter.stringFromDate(date)

    cell.descriptionLabel.text = object.valueForKey("descript")!.description
    cell.descriptionLabel.lineBreakMode = NSLineBreakMode.ByTruncatingTail

}

func controller(controller: NSFetchedResultsController, didChangeObject anObject: AnyObject, atIndexPath indexPath: NSIndexPath?, forChangeType type: NSFetchedResultsChangeType, newIndexPath: NSIndexPath?) {
    switch type {
    case .Insert:
        tableView.insertRowsAtIndexPaths([newIndexPath!], withRowAnimation: .Fade)
    case .Delete:
        tableView.deleteRowsAtIndexPaths([indexPath!], withRowAnimation: .Fade)
    case .Update:
        self.configureCell(tableView.cellForRowAtIndexPath(indexPath!)! as! CustomTableViewCell, withObject: anObject as! NSManagedObject)
    case .Move:
        tableView.moveRowAtIndexPath(indexPath!, toIndexPath: newIndexPath!)
    }
}

Answer 1

这似乎是一个框架问题，因为不仅 ImageView 还有两个其他日期标签和其他标签也丢失了，您是否向其添加了约束？