Question

我正在使用XCode 9.3和Swift 4开发iOS应用程序。

我有一个设置，我有一个屏幕，剧集视图，有关于特定视频的信息。

对于未登录的用户，该屏幕包含：

顶部的图片
有关视频的图像信息和小描述。
a登录按钮

“登录”按钮可打开模式。每当一个用户点击此按钮，用户应该登录，然后返回到剧集视图，其中图像应该由视频替换玩家（我们使用JW）和相应的剧集。

我创建了一个委托，在登录时调用EpisodeViewController中的方法：

func refreshTopView() {
    subscribed = 1
    setUpTopView()
    print("View has refreshed")
}

登录后，代理人会调用setUpTopView()

func setUpTopView() {

    if subscribed == 1 {

        // Hide the image view
        episodeImage.isHidden = true

        // Set up URL to video
        let linktoJSON = "https://content.jwplatform.com/feeds/" + (episode?.interviewKey)! + ".json";

        // Set video screen flag to true
        videoScreen = true

        // Get the feed for the video
        getFeed(url: linktoJSON)

    } else {

        // Hide the container view for the video
        containerView.isHidden = true

        // Get the show path and image file and set up the url
        let showPath = episode?.showPath
        let imageFile = episode?.imageFile
        let url = "https://examplesite.com/ios/images/" + showPath! + "/slider/" + imageFile! + ".jpg"

        // Show the image
        episodeImage.sd_setImage(with: URL(string: url))

    }
}

反过来调用getFeed()，因为用户已被验证为已订阅

func getFeed(url: String) {
    Alamofire.SessionManager.default
        .requestWithoutCache(url, method: .get).validate().responseJSON { response in
        switch response.result {

        case .success(let value):
            let json = JSON(value)
            self.buildPlaylistSources(json: json)

        case .failure(let error):
            print(error)
        }
    }
}

这将调用该函数来构建JW Player的播放列表，

func buildPlaylistSources(json: JSON) {
    playlistSources = [[String:String]]()

    if let playlistItems = json["playlist"].array {

        for item in playlistItems {
            if let sources = item["sources"].array {
                // For each source
                var tempSource = [String:String]()

                for source in sources {
                    if let sourceType = source["type"].string {
                        if sourceType.hasPrefix("video"){
                            let key = source["label"].stringValue
                            let value = source["file"].stringValue
                            tempSource[key] = value
                        }
                    }
                }
                playlistSources.append(tempSource)
            }
        }
        createPlayer()
    }
}

然后设置播放器并将其添加到屏幕

func createPlayer() {
    let config: JWConfig = JWConfig()

    let showPath = episode?.showPath
    let imageFile = episode?.imageFile
    let videoImage = "https://examplesite.com/ios/images/" + showPath! + "/slider/" + imageFile! + ".jpg"


    for playlistSource in playlistSources {
        let item = JWPlaylistItem()

        var sourceArray = [JWSource]()

        for (key, value) in playlistSource {
            sourceArray.append(JWSource(file: value, label: key))
        }

        item.sources = sourceArray
        item.image = videoImage

        playlist.append(item)
    }


    config.playlist = playlist
    config.controls = true



    player = JWPlayerController(config: config)
    player.delegate = self

    let frame: CGRect = containerView.bounds

    self.player.view.frame = frame
    self.player.view.autoresizingMask = [UIViewAutoresizing.flexibleBottomMargin, UIViewAutoresizing.flexibleHeight, UIViewAutoresizing.flexibleLeftMargin, UIViewAutoresizing.flexibleRightMargin, UIViewAutoresizing.flexibleTopMargin, UIViewAutoresizing.flexibleWidth]

    self.player.forceFullScreenOnLandscape = true
    self.player.forceLandscapeOnFullScreen = true

    containerView.addSubview(player.view)

    print("jwplayer")
}

即使代码一直运行到最后，并且隐藏了初始图像，也永远不会加载播放器。然而，如果我然后导航到不同的部分，然后返回到剧集视图，视频加载没有问题。此外，如果用户在之前登录时运行应用程序，则视频加载正常。只需从视频播放器无法加载的模态登录屏幕返回即可。

我检查了输出屏幕，得到了以下内容：

2018-04-11 08:52:54.515047-0500 MyAppIOS[8506:1047732] [MediaRemote] [AVOutputContext] WARNING: AVF context unavailable for +[MRAVOutputContext sharedAudioPresentationContext]_block_invoke
2018-04-11 08:52:54.515273-0500 MyAppIOS[8506:1047732] [MediaRemote] [AVOutputContext] WARNING: AVF context unavailable for +[MRAVOutputContext createOutputContextWithUniqueIdentifier:]
2018-04-11 08:52:57.476625-0500 MyAppIOS[8506:1050590] [0x7f95a686f000] Decoding failed with error code -1
2018-04-11 08:52:57.476904-0500 MyAppIOS[8506:1050590] [0x7f95a686f000] Decoding: C0 0x02800168 0x0000354A 0x11111100 0x00000000 16384
2018-04-11 08:52:57.477102-0500 MyAppIOS[8506:1050590] [0x7f95a686f000] Options: 640x360 [FFFFFFFF,FFFFFFFF] 00024060

Answer 1

正如NSGangster在评论中所回答的那样：

第一次进入VC（未登录）时，设置containerView.isHidden = true。你可能应该在某个地方将它设置为false，如果你想让它显示回来的话。这就是为什么我认为如果你重新加载VC它会起作用的原因。

视频播放器从模态返回时不加载

1 个答案: