我正在尝试在
ImageView中显示本地存储的.MP3轨道的专辑图片.有谁知道如何在
Swift中获取这件艺术品才能实现这一目标？
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
将您的代码片段更改为此(我已经测试过)：
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
}
}