我找到了这个解决方案(iOS AVFoundation: How do I fetch artwork from an mp3 file?),但代码是用Objective C编写的.我只是想抓住嵌入MP3中的图像并将其显示在我的ImageView中.
我已经查看了MPMediaItemArtwork的api文档,并找到了一个示例,它也完成了我在Objective C中尝试完成的任务(http://www.codeitive.com/0zHjkUjUWX/not-able-to-get-the-uiimage-from-mpmediaitempropertyartwork.html),但无法提出解决方案.我的代码如下:
import UIKit import AVFoundation import MediaPlayer class ViewController: UIViewController { let audioPath:NSURL! = NSBundle.mainBundle().URLForResource("SippinOnFire",withExtension: "mp3") @IBOutlet var artistimage: UIImageView! @IBOutlet var trackLabel: UILabel! @IBOutlet var artistLabel: UILabel! @IBOutlet var sliderValue: UiSlider! var player:AVAudioPlayer = AVAudioPlayer() @IBAction func play(sender: AnyObject) { let audioInfo = MPNowPlayingInfoCenter.defaultCenter() println(audioInfo) player.play() //println("Playing \(audioPath)") let playerItem = AVPlayerItem(URL: audioPath) let MetadataList = playerItem.asset.Metadata as! [AVMetadataItem] for item in MetadataList { if let stringValue = item.value { println(item.commonKey) if item.commonKey == "title" { trackLabel.text = stringValue as? String } if item.commonKey == "artist" { artistLabel.text = stringValue as? String } if item.commonKey == "artwork" { if let audioImage = UIImage(data: item.value as! NSData) { let audioArtwork = MPMediaItemArtwork(image: audioImage) println(audioImage.description) } } } } } @IBAction func pause(sender: AnyObject) { player.pause() } @IBAction func stop(sender: AnyObject) { player.stop() player.currentTime = 0; } @IBAction func sliderChanged(sender: AnyObject) { player.volume = sliderValue.value } override func viewDidLoad() { super.viewDidLoad() var error:NSError? = nil player = AVAudioPlayer(contentsOfURL: audioPath!,error: &error) player.volume = 0.5; } override func didReceiveMemoryWarning() { super.didReceiveMemoryWarning() // dispose of any resources that can be recreated. } }
这是我的示例.mp3文件的屏幕截图.正如您所看到的,确实有专辑图片在Finder的“获取信息”部分中都可见.我还在我的iTunes中打开了.mp3,以确保并确认其中的“获取信息”部分以及“艺术品”标签下都有艺术品.
但是,当尝试使用commonKey将图像分配给我的imageView时,我发现“艺术品”没有commonKey.
谢谢
I added println lines commented in places of interest,Feel free to uncomment in order to see what is happening.
for item in MetadataList { if item.commonKey == nil{ continue } if let key = item.commonKey,let value = item.value { //println(key) //println(value) if key == "title" { trackLabel.text = value as? String } if key == "artist" { artistLabel.text = value as? String } if key == "artwork" { if let audioImage = UIImage(data: value as! NSData) { //println(audioImage.description) artistimage.image = audioImage } } } }
UPDATE: A bit of clean up of this code
for item in MetadataList { guard let key = item.commonKey,let value = item.value else{ continue } switch key { case "title" : trackLabel.text = value as? String case "artist": artistLabel.text = value as? String case "artwork" where value is NSData : artistimage.image = UIImage(data: value as! NSData) default: continue } }
UPDATE: For Swift 4
for item in MetadataList { guard let key = item.commonKey?.rawValue,let value = item.value else{ continue } switch key { case "title" : trackLabel.text = value as? String case "artist": artistLabel.text = value as? String case "artwork" where value is Data : artistimage.image = UIImage(data: value as! Data) default: continue } }
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