Question

我的问题不在于从一般渠道中检索视频。我只想获得频道创建的所有“播放列表”，并检索每个播放列表的缩略图，标题和视频数量。

这是一个YouTube频道示例：

如您所见，有许多创建的播放列表。

截至目前，我只能获取最新上传的频道视频，在这种情况下只有5个。

使用以下代码：

let urlString = "https://www.googleapis.com/youtube/v3/playlistItems?part=snippet&playlistId=\(playlistID)&key=\(apiKey)"

// Create a NSURL object based on the above string.
    let targetURL = NSURL(string: urlString)

    // Fetch the playlist from Google.
    performGetRequest(targetURL, completion: { (data, HTTPStatusCode, error) -> Void in

        if HTTPStatusCode == 200 && error == nil
        {
            // Convert the JSON data into a dictionary.
            let resultsDict = try NSJSONSerialization.JSONObjectWithData(data!, options: []) as! Dictionary<NSObject, AnyObject>

            print("resultsDict = \(resultsDict)")

           ......
        }
        else
        {
            print("HTTP Status Code = \(HTTPStatusCode)")
            print("Error while loading channel videos: \(error)")
        }

    })

resultsDict的输出：

[etag: "DsOZ7qVJA4mxdTxZeNzis6uE6ck/0JswUeQp5Wp8607mWPWAfIZaNnM", kind: youtube#playlistItemListResponse, items: (
        {
        etag = "\"DsOZ7qVJA4mxdTxZeNzis6uE6ck/hQUAFFn45u2V47VqvBg1urbZevU\"";
        id = "UUS8cX3kg_pL2jw7cOjGoiBw9Ri_jF-DJp";
        kind = "youtube#playlistItem";
        snippet =         {
            channelId = "UCJKOvdk-nVzDAFR_9MF64sw";
            channelTitle = AppSpy;
            description = "James (@Metal_Slag) punches blocks and butt-stomps critters in neon platformer Super Phantom Cat.\n\nDOWNLOAD FROM THE APP STORE:\nhttps://itunes.apple.com/us/app/super-phantom-cat-be-jumpin/id1041873285?mt=8\n\nSUBSCRIBE TO APPSPY:\nhttps://www.youtube.com/subscription_center?add_user=appspy\n\nVISIT:\nhttp://www.pocketgamer.co.uk";
            playlistId = "UUJKOvdk-nVzDAFR_9MF64sw";
            position = 0;
            publishedAt = "2016-02-12T15:59:10.000Z";
            resourceId =             {
                kind = "youtube#video";
                videoId = qkMOjc02NRg;
            };
            thumbnails =             {
                default =                 {
                    height = 90;
                    url = "https://i.ytimg.com/vi/qkMOjc02NRg/default.jpg";
                    width = 120;
                };
                high =                 {
                    height = 360;
                    url = "https://i.ytimg.com/vi/qkMOjc02NRg/hqdefault.jpg";
                    width = 480;
                };
                maxres =                 {
                    height = 720;
                    url = "https://i.ytimg.com/vi/qkMOjc02NRg/maxresdefault.jpg";
                    width = 1280;
                };
                medium =                 {
                    height = 180;
                    url = "https://i.ytimg.com/vi/qkMOjc02NRg/mqdefault.jpg";
                    width = 320;
                };
                standard =                 {
                    height = 480;
                    url = "https://i.ytimg.com/vi/qkMOjc02NRg/sddefault.jpg";
                    width = 640;
                };
            };
            title = "MEW-RIO? | Super Phantom Cat iPhone & iPad Preview";
        };
    },
....
// Display info for most recent remaining 4 videos
....
, nextPageToken: CAUQAA, pageInfo: {
resultsPerPage = 5;
totalResults = 3966;
}]

如何使用youtube api v3检索其播放列表，而不是检索频道的视频？

由于

Answer 1

我发现您正在使用链接中的playlistItems。这只会从播放列表中抓取视频。

当您输入部分为snippet且channelid为UCJKOvdk-nVzDAFR_9MF64sw时，请按<{3}}和this link。然后单击“执行而不使用OAuth”。您将从该channelid获取所有播放列表的json对象。

在请求中，它会向您显示：

GET https://www.googleapis.com/youtube/v3/playlists?part=snippet&channelId=UCJKOvdk-nVzDAFR_9MF64sw&key={YOUR_API_KEY}

使用该网址，您应该可以抓住它。

Answer 2

这是一个非常好的教程，介绍如何从youtube获取视频： http://www.appcoda.com/youtube-api-ios-tutorial/

我使用该函数从youtube获取播放列表，但它是遗留代码（您需要在目标的构建设置中将遗留设置为true）而不是Swift 3.0（有人可以转换吗？！）

它使用您必须安装的这两个pod：

pod "youtube-ios-player-helper", "~> 0.1.4"
pod "iOS-GTLYouTube"

然后将它们导入视图控制器：导入youtube_ios_player_helper 导入iOS_GTLYouTube

我有一个带有几个不同表视图的标签栏，我根据选择的标签加载不同的播放列表。首先，我在表视图控制器定义中使用协议YTPlayerViewDelegate：

class YouTubeTableViewController: UITableViewController, YTPlayerViewDelegate {

然后我向表视图控制器添加一些属性，在这里获取api密钥https://console.developers.google.com/projectselector/apis/credentials：

var apiKey = "" //place your api key here, get your API key from https://console.developers.google.com/projectselector/apis/credentials

//PLVirhGJQqidpY7n9PJ57FwaW1iogJsFZH = Photographer
//PLVirhGJQqidqjbXhirvXnLZ5aLzpHc0lX = workout
//This array holds all the playlist ID's
var playListArray = ["PLVirhGJQqidpY7n9PJ57FwaW1iogJsFZH","PLVirhGJQqidqjbXhirvXnLZ5aLzpHc0lX"]

//An array to store the videos in your playlist
var videosArray: Array<Dictionary<NSObject, AnyObject>> = []

然后我使用这些函数，getVideosForPlayList需要播放列表作为参数，performGetRequest执行请求到youtube获取播放列表视频：

func getVideosForPlayList(playListID: String) {
    // Get the selected channel's playlistID value from the channelsDataArray array and use it for fetching the proper video playlst.
    let playlistID = playListID

    // Form the request URL string.
    let urlString = "https://www.googleapis.com/youtube/v3/playlistItems?part=snippet&playlistId=\(playlistID)&key=\(apiKey)"

    // Create a NSURL object based on the above string.
    let targetURL = NSURL(string: urlString)

    // Fetch the playlist from Google.
    performGetRequest(targetURL, completion: { (data, HTTPStatusCode, error) -> Void in
        if HTTPStatusCode == 200 && error == nil {
            do {
                // Convert the JSON data into a dictionary.
                let resultsDict = try NSJSONSerialization.JSONObjectWithData(data!, options: []) as! Dictionary<NSObject, AnyObject>

                // Get all playlist items ("items" array).
                let items: Array<Dictionary<NSObject, AnyObject>> = resultsDict["items"] as! Array<Dictionary<NSObject, AnyObject>>

                // Use a loop to go through all video items.
                for var i=0; i<items.count; ++i {
                    let playlistSnippetDict = (items[i] as Dictionary<NSObject, AnyObject>)["snippet"] as! Dictionary<NSObject, AnyObject>

                    // Initialize a new dictionary and store the data of interest.
                    var desiredPlaylistItemDataDict = Dictionary<NSObject, AnyObject>()

                    desiredPlaylistItemDataDict["title"] = playlistSnippetDict["title"]
                    desiredPlaylistItemDataDict["thumbnail"] = ((playlistSnippetDict["thumbnails"] as! Dictionary<NSObject, AnyObject>)["default"] as! Dictionary<NSObject, AnyObject>)["url"]
                    desiredPlaylistItemDataDict["videoID"] = (playlistSnippetDict["resourceId"] as! Dictionary<NSObject, AnyObject>)["videoId"]

                    // Append the desiredPlaylistItemDataDict dictionary to the videos array.
                    self.videosArray.append(desiredPlaylistItemDataDict)

                    // Reload the tableview.
                }
                self.tableView.reloadData()

            } catch {
                print(error)
            }
        }
        else {
            print("HTTP Status Code = \(HTTPStatusCode)")
            print("Error while loading channel videos: \(error)")
        }

    })
}

// MARK: Custom method implementation
func performGetRequest(targetURL: NSURL!, completion: (data: NSData?, HTTPStatusCode: Int, error: NSError?) -> Void) {
    let request = NSMutableURLRequest(URL: targetURL)
    request.HTTPMethod = "GET"

    let sessionConfiguration = NSURLSessionConfiguration.defaultSessionConfiguration()

    let session = NSURLSession(configuration: sessionConfiguration)

    let task = session.dataTaskWithRequest(request, completionHandler: { (data: NSData?, response: NSURLResponse?, error: NSError?) -> Void in
        dispatch_async(dispatch_get_main_queue(), { () -> Void in
            completion(data: data, HTTPStatusCode: (response as! NSHTTPURLResponse).statusCode, error: error)
        })
    })

    task.resume()
}

我从viewDidAppear函数中调用getVideosForPlaylist函数（因此每次都会加载一个不同的列表，并且tabbar的selectedIndex是刚刚选中的列表）。我在viewDidLoad中注册我的自定义单元格（我想稍微自定义我的youtube单元格）：

override func viewDidLoad() {
    super.viewDidLoad()

    let youTubeCell = UINib(nibName: "YouTubeCell", bundle: nil)
    self.tableView.registerNib(youTubeCell, forCellReuseIdentifier: "YouTubeCell")
}

override func viewDidAppear(animated: Bool) {
    self.videosArray = []
    if let tabIndex = self.tabBarController?.selectedIndex,
        let playListID = playListArray[tabIndex] as? String{
        getVideosForPlayList(playListID)
    }

}

在我的部分表格视图方法中的行数中，我确保返回我的videosArray中的视频数量，这些视频会根据您加载的频道而变化：

// MARK: - Table view data source
override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    return videosArray.count
}

在我的cellForRowAtIndexPath函数中，我确保为每个加载的视频获取正确的视频ID，并将此videoID传递给我的loadVideoWithID函数：

let video = videosArray[indexPath.row]
let videoID = video["videoID"] as! String
cell.youTubePlayer.loadWithVideoId(videoID)

这是代码

https://github.com/benSmith1981/youtubeapp

如何使用Swift获取youtube频道的所有播放列表？

2 个答案: