UITableView 过滤后的数据索引不正确

Question

这是我从 CoreData 过滤数据的代码，它提供了更正的数据，但如果我查看记录的详细信息，它会给我错误的数据。

意思是我有详细的 VC，可以显示更大的相机图像。因此，如果索引是过滤器数据的 1，但索引 1 中相机的实际索引在 CoreData 中实际上是 20。我该如何纠正这个问题？

func fetch() {
    let appDel: AppDelegate = UIApplication.sharedApplication().delegate as! AppDelegate
    // Ref data
    let context: NSManagedObjectContext = appDel.managedObjectContext!
    let freq = NSFetchRequest(entityName: "Cameras")
    let predicate = NSPredicate(format: "locationname == %@", "lobby")
    freq.predicate = predicate
    let fetchResults = try! context.executeFetchRequest(freq) as? [NSManagedObject]
    filteredData.removeAll(keepCapacity: false)
    filteredData = fetchResults!
    searchActive = true;
}

更新
请求更新信息。

    override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    if searchActive {
        return filteredData.count
    } else {
    return myData.count
    }
}

下一项。

    override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCellWithIdentifier("cameraCell", forIndexPath: indexPath) as! camerasTableViewCell
    if searchActive {
    let data = filteredData[indexPath.row]
    cell.nameLabel.text =  data.valueForKey("name") as? String
    cell.roadName.text = data.valueForKey("locationname") as? String
    let CamImage =  data.valueForKey("dImage") as! NSData
    let CameraImage: UIImage = UIImage(data: CamImage)!
    cell.imageUrl?.image = CameraImage
    } else {
        let data = myData[indexPath.row]
        cell.nameLabel.text =  data.valueForKey("name") as? String
        cell.roadName.text = data.valueForKey("locationname") as? String
        let CamImage =  data.valueForKey("dImage") as! NSData
        let CameraImage: UIImage = UIImage(data: CamImage)!
        cell.imageUrl?.image = CameraImage
    }
    return cell
}

下一项

    override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
    let selectedIndexPath:NSIndexPath = self.tableView.indexPathForSelectedRow!

    let vc = segue.destinationViewController as! largeCameraViewController
    vc.row = selectedIndexPath.row

}

Answer 1

您应该在prepareForSegue 中传递对象本身，而不是行。将属性添加到您的 LargeCameraViewController：

var camera : NSManagedObject?

然后在prepareForSegue中，根据searchActive是真还是假，从filteredData或myData的相关行中获取camera：

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
    let selectedIndexPath:NSIndexPath = self.tableView.indexPathForSelectedRow!
    let vc = segue.destinationViewController as! largeCameraViewController
    if (searchActive) {
        vc.camera = filteredData[selectedIndexPath.row] as! NSManagedObject
    } else {
        vc.camera = myData[selectedIndexPath.row] as! NSManagedObject
    }
}

然后在LargeCameraViewController 中，您可以从camera NSManagedObject 访问相关属性。