Swift Video Feed

Question

我是快速开发（和一般编码）的新手，我正在尝试开发一个表视图控制器，它将在视频完全显示时显示视频和播放。我可以播放视频，但我真的希望能够加载所有视频并暂停那些不完全可见的视频，而不是在滚动时重新加载视频。

此时，我有一个表视图类，其中包含一个播放视频的方法，并检查scrollViewDidScroll中的可见单元格。在scrollViewDidScroll中，我有一系列if语句，我实现它们以响应可见单元格的数量。

TableViewCell.swift：

@IBOutlet weak var movieView:UIView!
var moviePlayer:MPMoviePlayerController!
var videoURL:NSURL!

override func awakeFromNib() {
    super.awakeFromNib()
    //initialize movie player
    moviePlayer = MPMoviePlayerController(contentURL: videoURL)  
}
override func setSelected(selected: Bool, animated: Bool) {
    super.setSelected(selected, animated: animated)
}

//Action to load video
func displayVideo() {
    moviePlayer = MPMoviePlayerController(contentURL: videoURL)
    moviePlayer.controlStyle = MPMovieControlStyle.None
    moviePlayer.scalingMode = MPMovieScalingMode.Fill
    moviePlayer.movieSourceType = MPMovieSourceType.File
    moviePlayer.repeatMode = MPMovieRepeatMode.One
    moviePlayer.initialPlaybackTime = -1.0
    moviePlayer.view.frame = movieView.bounds
    moviePlayer.view.center = CGPointMake(CGRectGetMidX(movieView.bounds), CGRectGetMidY(movieView.bounds))
    movieView.addSubview(moviePlayer.view)
    moviePlayer.prepareToPlay()
    moviePlayer.play()
}

TableViewController.swift：

var objects = [[String: String]]()
var moviePlayer:MPMoviePlayerController!



override func viewDidLoad() {
    super.viewDidLoad()
}
override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
}


//Number of table view sections
override func numberOfSectionsInTableView(tableView: UITableView) -> Int {

    return 1
}


//Number of table view rows
override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {

    return self.objects.count
}


override func scrollViewDidScroll(scrollView: UIScrollView) {


    let indexPaths = tableView.indexPathsForVisibleRows

    if indexPaths?.count == 1 {

        let cell1:TableViewCell = tableView.cellForRowAtIndexPath(indexPaths![0] as NSIndexPath) as! TableViewCell

        var cellRect : CGRect = self.tableView.rectForRowAtIndexPath(indexPaths![0])
        cellRect = self.tableView.superview!.convertRect(cellRect, fromView: self.tableView)

        if self.tableView.frame.contains(cellRect) {
            if cell1.moviePlayer.playbackState == MPMoviePlaybackState.Playing {
                print("keep playing")
            }else{
                cell1.videoURL = NSURL(string: self.objects[indexPaths![0].row]["storyLink"]!)!
                cell1.displayVideo()
            }
        }

    }else if indexPaths?.count == 2 {


        let cell1:TableViewCell = tableView.cellForRowAtIndexPath(indexPaths![0] as NSIndexPath) as! TableViewCell

        let cell2:TableViewCell = tableView.cellForRowAtIndexPath(indexPaths![1] as NSIndexPath) as! TableViewCell


        var cellRect1 : CGRect = self.tableView.rectForRowAtIndexPath(indexPaths![0])
        cellRect1 = self.tableView.superview!.convertRect(cellRect1, fromView: self.tableView)

        var cellRect2 : CGRect = self.tableView.rectForRowAtIndexPath(indexPaths![1])
        cellRect2 = self.tableView.superview!.convertRect(cellRect2, fromView: self.tableView)


        if self.tableView.frame.contains(cellRect1) {

            if cell1.moviePlayer.playbackState == MPMoviePlaybackState.Playing {
                print("keep playing")
            }else{
                cell1.videoURL = NSURL(string: self.objects[indexPaths![0].row]["storyLink"]!)!
                cell1.displayVideo()
            }


        } else if self.tableView.frame.contains(cellRect2) {

            if cell2.moviePlayer.playbackState == MPMoviePlaybackState.Playing {
                print("keep playing")
            } else {
                cell2.videoURL = NSURL(string: self.objects[indexPaths![1].row]["storyLink"]!)!
                cell2.displayVideo()
            }
        }

    } else if indexPaths?.count > 2 {

       let cell1:TableViewCell = tableView.cellForRowAtIndexPath(indexPaths![0] as NSIndexPath) as! TableViewCell

        let cell2:TableViewCell = tableView.cellForRowAtIndexPath(indexPaths![1] as NSIndexPath) as! TableViewCell

        let cell3:TableViewCell = tableView.cellForRowAtIndexPath(indexPaths![2] as NSIndexPath) as! TableViewCell


        var cellRect1 : CGRect = self.tableView.rectForRowAtIndexPath(indexPaths![0])
        cellRect1 = self.tableView.superview!.convertRect(cellRect1, fromView: self.tableView)

        var cellRect2 : CGRect = self.tableView.rectForRowAtIndexPath(indexPaths![1])
        cellRect2 = self.tableView.superview!.convertRect(cellRect2, fromView: self.tableView)

        var cellRect3 : CGRect = self.tableView.rectForRowAtIndexPath(indexPaths![2])
        cellRect3 = self.tableView.superview!.convertRect(cellRect3, fromView: self.tableView)


        if self.tableView.frame.contains(cellRect1) {

            if cell1.moviePlayer.playbackState == MPMoviePlaybackState.Playing {
                print("keep playing")
            }else{
                cell1.videoURL = NSURL(string: self.objects[indexPaths![0].row]["storyLink"]!)!
                cell1.displayVideo()
            }

        } else if self.tableView.frame.contains(cellRect2) {

            if cell2.moviePlayer.playbackState == MPMoviePlaybackState.Playing {
                print("keep playing")
            } else {
                cell2.videoURL = NSURL(string: self.objects[indexPaths![1].row]["storyLink"]!)!
                cell2.displayVideo()
            }

        } else if self.tableView.frame.contains(cellRect2) {
            if cell3.moviePlayer.playbackState == MPMoviePlaybackState.Playing {
                print("keep playing")
            } else {
                cell3.videoURL = NSURL(string: self.objects[indexPaths![2].row]["storyLink"]!)!
                cell3.displayVideo()
            }
        }
    }
}

代码可以工作，但实际上并不是我想要的。我真的想在滚动时暂停视频，并且可以看到新的单元格。

我确信有更好的方法来实现这一目标，但正如我之前提到的那样，我是一个新手，并且正在将这些内容与我在网上找到的东西拼凑在一起。

任何帮助都非常感激。