Question

如何将网址中的图片加载到MPMediaItemArtwork？

现在我有来自图片资源的专辑封面，请参阅下面的代码。

if NSClassFromString("MPNowPlayingInfoCenter") != nil {
    let image:UIImage = UIImage(named: "logo_player_background")!
    let albumArt = MPMediaItemArtwork(image: image)

    MPNowPlayingInfoCenter.defaultCenter().nowPlayingInfo = [MPMediaItemPropertyArtist: blogPosts[0].postTitle, MPMediaItemPropertyTitle: blogPosts[0].postArtist, MPMediaItemPropertyArtwork: albumArt];
}

Answer 1

最佳方法是异步下载图像并执行此复制以下VC中的函数使用此SO answer 供我参考

func downloadImage(url:NSURL, completion: ((image: UIImage?) -> Void)){
        print("Started downloading \"\(url.URLByDeletingPathExtension!.lastPathComponent!)\".")
        getDataFromUrl(url) { data in
            dispatch_async(dispatch_get_main_queue()) {
                print("Finished downloading \"\(url.URLByDeletingPathExtension!.lastPathComponent!)\".")


                completion(image: UIImage(data: data!))

            }
        }
    }

    func getDataFromUrl(url:NSURL, completion: ((data: NSData?) -> Void)) {
        NSURLSession.sharedSession().dataTaskWithURL(url) { (data, response, error) in
            completion(data: data)
            }.resume()
    }

然后像这样打电话

if NSClassFromString("MPNowPlayingInfoCenter") != nil {
            let image:UIImage = UIImage(named: "logo_player_background")!
            let url = NSURL(string: "http://www.apple.com/euro/ios/ios8/a/generic/images/og.png") // your url path
            //check your url or anyother condidtions you want 
            downloadImage(url!, completion: { (image) -> Void in
                let albumArt = MPMediaItemArtwork(image: image!)

                MPNowPlayingInfoCenter.defaultCenter().nowPlayingInfo = [MPMediaItemPropertyArtist: blogPosts[0].postTitle, MPMediaItemPropertyTitle: blogPosts[0].postArtist, MPMediaItemPropertyArtwork: albumArt];
            })

对于同步方法 不推荐

dispatch_async(dispatch_get_global_queue( DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), {
var test =  UIImage(data: NSData(contentsOfURL: NSURL(string:"http://devhumor.com/wp-content/uploads/2012/04/devhumor.com_pointers.png")))
})

如何在MPMediaItemArtwork中加载URL图像

1 个答案: