仅在iPhone 4S上的postNotification之后添加观察者

Question

我有一个功能齐全的代码，可以在iOS> 8.0（适用于iPhone> 5的iPhone和所有iPad）上完美运行，在这里我可以通过Observers / Notifications传递信息和调用功能，但是在iPhone 4S上却无法正常工作。

通过调试，我实际上发现， 只有在iPhone 4S上运行时，观察者是在通知发布后添加的。

这分别在iOS 8和iOS 9的设备和模拟器上发生。

码：

**PostNotification**
override func viewDidLoad() {
    super.viewDidLoad()

    self.registerCells()

    UIApplication.sharedApplication().statusBarStyle = .LightContent

    self.collectionView.delaysContentTouches = false

    NSNotificationCenter.defaultCenter().addObserver(self, selector: "footerUpdateContentSize:", name: "footerUpdateContentSize", object: nil)
    NSNotificationCenter.defaultCenter().addObserver(self, selector: "seasonUpdateContentSize:", name: "seasonUpdateContentSize", object: nil)

    self.loadDetailTVShow()
}

func registerCells()
{
    self.collectionView.registerClass(HeaderDetailSeriesCell.self, forCellWithReuseIdentifier: "HeaderDetailSeriesCell")
    self.collectionView.registerClass(FooterDetailSeriesCell.self, forCellWithReuseIdentifier: "FooterDetailSeriesCell")
    self.collectionView.registerClass(SeriesSeasonContentCell.self, forCellWithReuseIdentifier: "SeriesSeasonContentCell")
}


func loadDetailTVShow()
{
    let id: String! = (tvShow != nil) ? tvShow!.id! : episode!.seriesId!

    ContentsClient().getContentById(id!).then { data -> Void in
        let m: TVShow? = data as! TVShow?
        self.tvShow = m!
        self.collectionView.reloadData()

        NSNotificationCenter.defaultCenter().postNotificationName("loadedTvShowlist", object: self.tvShow)

        UIView.animateWithDuration(1.0, delay: 0, options: .TransitionNone, animations:
            {
                self.loadingView.alpha = 0.0

            }, completion:nil)
    }
}
func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell
{
    cell = collectionView.dequeueReusableCellWithReuseIdentifier("SeriesSeasonContentCell", forIndexPath: indexPath)

    let seriesContent = cell as! SeriesSeasonContentCell

    seriesContent.seriesContentCell?.tvShow = self.tvShow

    seriesContent.contentView.frame = CGRect(x: 0.0, y: 0.0, width: width, height: heightSeason)
    seriesContent.seriesContentCell?.view.frame = seriesContent.contentView.frame
}

**Observer**

class SeriesSeasonContent

override func viewDidLoad() {
    super.viewDidLoad()

    self.registerCells()

    seasonSelectedIndex = 0

    collectionView.reloadData()

    NSNotificationCenter.defaultCenter().addObserver(self, selector: "loadedTvShowlist:", name: "loadedTvShowlist", object: nil)
}

func registerCells ()
{
    self.seasonCollection.registerClass(SeasonViewCell.self, forCellWithReuseIdentifier: "SeasonViewCell")

    self.collectionView.registerClass(EpisodeViewCell.self, forCellWithReuseIdentifier: "EpisodeViewCell")
}

func loadedTvShowlist(notification : NSNotification){
    self.tvShow = notification.object! as? TVShow

    if (tvShow?.seasons != nil && tvShow?.seasons?.count > 0)
    {
        self.currentSeason = ((tvShow?.seasons!.objectAtIndex(seasonSelectedIndex) as? Season)?.episodes)!

        self.collectionView.reloadData()
        self.seasonCollection.reloadData()
    }
}

Obs：我在同一视图中使用了多个collectionview，并且nib文件的命名正确

通知发布后，iPhone 4S是否有理由加载viewDidLoad方法？

Answer 1

设法解决了我的问题。 iPhone 4s的屏幕尺寸不足以触发cellForIndex事件，并且直到手机屏幕向下滚动时才启动类/观察程序。