ios - 仅在 iPhone 4S 上在 postNotification 后添加观察者

Question

我有一个功能齐全的代码，可以在适用于 iPhone >5 和所有 iPad 的 iOS >8.0 上完美运行，我通过观察者/通知传递信息和调用功能，但在 iPhone 4S 上它不起作用。

通过调试，我实际上发现仅在 iPhone 4S 上运行时，观察者会在通知发布后添加。

这分别发生在 iOS 8 和 9 的设备和模拟器上。

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()
    }
}

观察:我在同一 View 中使用多个 Collection View ，并且 nib 文件命名正确

在通知发布后，iPhone 4S 是否会加载 viewDidLoad 方法，有什么原因吗？

Answer 1

设法解决我的问题。 iphone 4s 屏幕尺寸不够大，无法触发 cellForIndex 事件，并且直到手机屏幕向下滚动后才会启动类/观察者。