swift - 突出显示当前 UICollectionViewCell tvOS

Question

我目前正在开发一个应用程序作为 appleTV 的概念验证。我正在尝试显示一个队列。在不同的部门是分开的。我们有 Mac、iPhone、iPad……我想自动更新我的 collectionView 以显示哪个部门正在显示。

我已经成功地自动更新了我的 tableview。

有什么东西没看到吗？

这是我的 Controller 的代码

class QueueViewController : UIViewController, UICollectionViewDelegate, UICollectionViewDataSource, UITableViewDelegate, UITableViewDataSource {
var departments = [Department]()
var users = [User]()
let dateFormatter = NSDateFormatter()
@IBOutlet weak var collectionView: UICollectionView!
@IBOutlet weak var tableView: UITableView!


override func viewDidLoad() {
    print("QueueViewController")
    collectionView.delegate = self
    collectionView.dataSource = self
    self.view.backgroundColor = UIColor(patternImage: UIImage(named: "BackgroundQueue")!)
    fetchDepartments()
    dateFormatter.dateFormat = "HH:mm"
}
override func viewWillAppear(animated: Bool) {
    //Hier moet de fetch task worden uitgevoerd
    if departments.count > 0 {
        startTimer()
    }
}
override func viewWillDisappear(animated: Bool) {
    stopTimer()
}
//MARK: - CollectionView
func numberOfSectionsInCollectionView(collectionView: UICollectionView) -> Int {
    return 1
}
func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
    return departments.count
}
func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
    let cell = collectionView.dequeueReusableCellWithReuseIdentifier("cell", forIndexPath: indexPath) as! DepartmentItemCell
    let department = departments[indexPath.row]
    let title = department.name
    cell.DepartmentButton.setTitle(title, forState: .Normal)
    cell.DepartmentButton.backgroundColor = UIColor.clearColor()
    cell.DepartmentButton.restorationIdentifier = department.id
    return cell

}
func collectionView(collectionView: UICollectionView, didSelectItemAtIndexPath indexPath: NSIndexPath) {
    print("indexpath :\(indexPath.row)")
}

@IBAction func selectDepartment(sender: AnyObject) {
    fetchQueueForDepartment(sender.restorationIdentifier!!)
}

//MARK: - TableView
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    return users.count
}
func numberOfSectionsInTableView(tableView: UITableView) -> Int {
    return 1
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCellWithIdentifier("tableCell") as! QueueItemCell
    let user = users[indexPath.row]

    if indexPath.row == 0 {
        let attributes = [
            NSUnderlineStyleAttributeName : 1]
        let title = NSAttributedString(string: "\(user.firstname!) \(user.lastname!)", attributes: attributes) //1
        cell.nameLabel.attributedText = title
        return cell

    }

    cell.nameLabel.text = "\(user.firstname!) \(user.lastname!)"
    cell.arrivalLabel.text = user.arrivalDate == nil ? "" : dateFormatter.stringFromDate(user.arrivalDate!)

 return cell
}

//MARK: - Focus update
override func didUpdateFocusInContext(context: UIFocusUpdateContext, withAnimationCoordinator coordinator: UIFocusAnimationCoordinator) {
    super.didUpdateFocusInContext(context, withAnimationCoordinator: coordinator)


}
//Zorgt ervoor dat je de cellen in collectionview kan selecteren. focus op zetten
func collectionView(collectionView: UICollectionView, canFocusItemAtIndexPath indexPath: NSIndexPath) -> Bool
{
    return false
}

//MARK: - Parse
func fetchDepartments(){
    SVProgressHUD.show()
    ParseService.sharedInstance.fetchDepartments({
        (error, data) -> () in
        if let json_data = data?["result"] {
            self.departments = DepartmentHandler.parseJson(json_data!)
            dispatch_async(dispatch_get_main_queue(), {
                () -> Void in
                print("succeed")
                self.collectionView.reloadData()
                SVProgressHUD.dismiss()
                //Eerste departement
                self.fetchQueueForDepartment(self.departments[0].id!)
                self.startTimer()

            })
        }
    })
}

func fetchQueueForDepartment(identifier: String){
    SVProgressHUD.show()
    ParseService.sharedInstance.fetchUsersPerDepartment(identifier,completion:{
        (error, data) -> () in
        if let json_data = data?["result"] {
            self.users = UserHandler.parseJSon(json_data!)
            dispatch_async(dispatch_get_main_queue(), {
                () -> Void in
                print("succeed")
                self.tableView.reloadData()

                //self.updateFocusCell()
                SVProgressHUD.dismiss()
            })
        }
    })

}


//-----------------------------------------------
//For the loop
var timer: dispatch_source_t!
var item = 0
//MARK: - Loop fetch
func startTimer() {

    let queue = dispatch_queue_create("com.icapps.caps", nil)
    timer = dispatch_source_create(DISPATCH_SOURCE_TYPE_TIMER, 0, 0, queue)
    dispatch_source_set_timer(timer, DISPATCH_TIME_NOW, 10 * NSEC_PER_SEC, 1 * NSEC_PER_SEC) // every 10 seconds, with leeway of 1 second
    dispatch_source_set_event_handler(timer) {
        // do whatever you want here
        let indexPath = NSIndexPath(forRow: self.item, inSection: 0)
        self.fetchQueueForDepartment(self.departments[indexPath.row].id!)

        self.collectionView.selectItemAtIndexPath(indexPath, animated: true, scrollPosition: .None)



        print(self.item)
        print(self.departments[indexPath.row].name!)

        self.item++
        if self.item == self.departments.count {
            self.item = 0
        }

    }
    dispatch_resume(timer)

}

func stopTimer() {
    if timer != nil {
        print("Stop")
        dispatch_source_cancel(timer)
        timer = nil
    }

}
  }

Answer 1

可以使用collectionview Delegate方法，方法名是

func collectionView(collectionView: UICollectionView, didUpdateFocusInContext context: UICollectionViewFocusUpdateContext, withAnimationCoordinator coordinator: UIFocusAnimationCoordinator) 
{
}

你可以像这样使用这个方法......

func collectionView(collectionView: UICollectionView, didUpdateFocusInContext context: UICollectionViewFocusUpdateContext, withAnimationCoordinator coordinator: UIFocusAnimationCoordinator) {

    if let previousIndexPath = context.previouslyFocusedIndexPath,
        let cell = collectionView.cellForItemAtIndexPath(previousIndexPath) {
        cell.contentView.layer.borderWidth = 0.0
        cell.contentView.layer.shadowRadius = 0.0
        cell.contentView.layer.shadowOpacity = 0
    }

    if let indexPath = context.nextFocusedIndexPath,
        let cell = collectionView.cellForItemAtIndexPath(indexPath) {
        cell.contentView.layer.borderWidth = 8.0
        cell.contentView.layer.borderColor = UIColor.blackColor().CGColor
        cell.contentView.layer.shadowColor = UIColor.blackColor().CGColor
        cell.contentView.layer.shadowRadius = 10.0
        cell.contentView.layer.shadowOpacity = 0.9
        cell.contentView.layer.shadowOffset = CGSize(width: 0, height: 0)
        collectionView.scrollToItemAtIndexPath(indexPath, atScrollPosition: [.CenteredHorizontally, .CenteredVertically], animated: true)
    }
}