从详细视图控制器向我的日程表的 swift 数组添加行将不起作用

Question

我有一个事件列表，其中每个事件都通过来自核心数据模型的 object 将数据传递给详细信息 VC。例如，Event 可以有标题、日期、房间、收藏夹等。现在，从 DetailVC 开始，我有一个 "Add to my Schedule" 按钮让用户 select他们最喜欢参加的活动。单击后，我想将此 object 保存到数组中。

我得到这个错误1：

Cannot invoke append with an argument list of type String.

详细视图控制器：

class DetailViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {

    var managedObjectContext: NSManagedObjectContext? = nil

    //    @IBOutlet weak var detailDescriptionLabel: UILabel!

    @IBOutlet weak var tableView: UITableView!

    //create a new array to hold on favorite objects (sessions add it to My Schedule)
    var favesArray = [Event]()

    var detailItem: Event!

这是详细视图控制器cellForRowAtIndexPath:

func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {

    if indexPath.section == Sections.info && indexPath.row == 1 {
        let cell: TitleCell = tableView.dequeueReusableCellWithIdentifier("faveCell", forIndexPath: indexPath) as! TitleCell

        if detailItem.isFavorite.boolValue {
            cell.valueFaveButton.setTitle("Remove from My Schedule", forState: .Normal)
        } else {
            cell.valueFaveButton.setTitle("Add to My Schedule", forState: .Normal)
        }

        cell.valueFaveButton.addTarget(self, action: "myScheduleButton:", forControlEvents: .TouchUpInside)

        return cell

    } else if indexPath.section == Sections.info && indexPath.row == 0 {

        let cell: TitleCell = tableView.dequeueReusableCellWithIdentifier("TitleCell", forIndexPath: indexPath) as! TitleCell

        let dateFormatter = NSDateFormatter()
        dateFormatter.dateFormat = "hh:mm"
        var dateString = dateFormatter.stringFromDate(detailItem!.date)

        cell.titleLabel.text = detailItem?.title
        cell.fieldLabel.text = dateString

        return cell

    } else if indexPath.section == Sections.info && indexPath.row == 2 {
        let cell: RemoveFaveCell = tableView.dequeueReusableCellWithIdentifier("removeFaveCell", forIndexPath: indexPath) as! RemoveFaveCell

        cell.removeFaveButton.addTarget(self, action: "removeFavoriteButton:", forControlEvents: .TouchUpInside)

        return cell

    } else if indexPath.section == Sections.description {

        let cell: LabelCell = tableView.dequeueReusableCellWithIdentifier("labelCell", forIndexPath: indexPath) as! LabelCell

        cell.labelDescriptionField.text = "Swift is the new language from Apple."

        return cell
    } else {

        assertionFailure("Unhandled session table view section")
        let cell = tableView.dequeueReusableCellWithIdentifier("reuseIdentifier", forIndexPath: indexPath) as! UITableViewCell

        return cell
    }
}

    func myScheduleButton(sender: UIButton) {


      detailItem.isFavorite = !detailItem.isFavorite.boolValue

      tableView.reloadSections(NSIndexSet(index: Sections.info), withRowAnimation: .Automatic)

        //now add this clicked/save object(event row) over the faves array


        //1 yellow warning in next line:Conditional Cast from Event to  Event always succeeds. But it compiles fine.
        if let faveSession:Event = detailItem as? Event {

            self.favesArray.append(faveSession)
        }


    }

还想不通。这是处理核心数据 object 以便稍后保存为新数组的有效方法吗？在我的例子中，这将在按下名为“我的日程安排”的分段按钮时显示。谢谢你的回答。

Event.swift

class Event: NSManagedObject {

    @NSManaged var date: NSDate
    @NSManaged var isFavorite: NSNumber
    @NSManaged var timeStamp: NSDate
    @NSManaged var title: String
    @NSManaged var classSelected: String
    @NSManaged var desc: String
    
}

显示我的日程安排（favesArray objects select 详细VC）

@IBAction func FilterHSClassesByPeriod(sender: UISegmentedControl) {
        let classSelected: String?
        
        if sender.selectedSegmentIndex == 0 {
            classSelected = "Period 1"
        }else {
            classSelected = "My Schedule"
        }        
      
        let filterPredicate = NSPredicate(format: "classSelected = %@", classSelected!)
        var request: NSFetchRequest = self.fetchedResultsController.fetchRequest
        
        request.predicate = filterPredicate        
      
        var e: NSError? = nil
        
        self.fetchedResultsController.performFetch(&e)        
       
        self.tableView.reloadData()
        
    }

Answer 1

您将 favesArray 定义为事件数组：

var favesArray = [Event]()

但是您正试图附加一个字符串

if let faveSession:String = detailItem.title as? String {
  self.favesArray.append(faveSession) 
}

如果您希望能够附加事件和字符串，您需要将声明更改为：

var favesArray = [AnyObject]()

或者（如果可能）将您的 faveSession 转换为 Event 而不是 String，但您可以决定是否可行

if let faveSession:Event = detailItem.title as? Event {
  self.favesArray.append(faveSession) 
}

从详细视图控制器向我的日程表的 swift 数组添加行将不起作用

Adding rows to a swift array of my Schedule from a Detail View Controller won't work

arrays

core-data

swift

xcode6.3.2