仅在iPhone 4S上使用postNotification后添加了观察者

Question

我有一个功能完整的代码，可以在iPhone> 5和所有iPad上完美运行，其中我通过观察者/通知传递信息和调用功能，但在iPhone 4S上它只是不起作用。

经过调试，我实际上是ONLY发现，在iPhone 4S上运行的观察者会添加后通知被张贴一段时间。

这发生在设备和模拟器上，分别在iOS 8和9上。

代码：

**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() 
    } 
} 

观测数据：进出口使用在同一视图中的多个collectionviews和笔尖文件被正确命名

没有任何理由为什么iPhone 4S确实加载viewDidLoad方法通知发布之后？

Answer 1

管理解决我的问题。 iPhone 4s的屏幕尺寸不足以触发cellForIndex事件，直到手机屏幕向下滚动，才启动类/观察者。