Question

我得到了它的工作但是当我选择要播放的歌曲时，歌曲的标题第一次没有出现。我必须回到媒体选择器并再次选择歌曲以显示歌曲的标题。为什么我第一次选择这首歌时它不起作用？当我选择播放另一首歌时，如何删除歌曲的标题？谢谢！这是我的代码：

func mediaPicker(mediaPicker: MPMediaPickerController, didPickMediaItems mediaItemCollection: MPMediaItemCollection) {


if mediaItemCollection.items.count == 2{
mediaPicker.dismissViewControllerAnimated(true, completion: nil)



let aMediaItem = mediaItemCollection.items[0] as MPMediaItem
music = aMediaItem
NSLog("\(aMediaItem.title)selected")

let url: NSURL = (music.valueForProperty(MPMediaItemPropertyAssetURL) as? NSURL)!

    do {
        musicPlayer = try AVAudioPlayer(contentsOfURL: url)

    } catch {

        return
    }

        titleLabel2.text = music.title
        titleLabel2 = SKLabelNode(fontNamed: "TimeBurner")
        titleLabel2.fontColor = UIColor.whiteColor()
        titleLabel2.zPosition = 40
        titleLabel2.fontSize = 16
        titleLabel2.position = CGPointMake(self.size.width / 5.3, self.size.height / 1.2)
        addChild(titleLabel2)



    let aMediaItem2 = mediaItemCollection.items[1] as MPMediaItem
    music2 = aMediaItem2
    NSLog("\(aMediaItem2.title)selected")
    let url2: NSURL = (music2.valueForProperty(MPMediaItemPropertyAssetURL) as? NSURL)!

    do {
        musicPlayer2 = try AVAudioPlayer(contentsOfURL: url2)

    } catch {

        return
    }

    titleLabel.text = music2.title
    titleLabel = SKLabelNode(fontNamed: "TimeBurner")
    titleLabel.fontColor = UIColor.whiteColor()
    titleLabel.zPosition = 40
    titleLabel.fontSize = 16
    titleLabel.position = CGPointMake(self.size.width / 1.3, self.size.height / 1.2)
    addChild(self.titleLabel)

    }
}

Answer 1

继承人如何让它发挥作用。我将标题标签添加到didmovetoview并将文本添加到didPickMediaItems。

override func didMoveToView(view: SKView) {
titleLabel2 = SKLabelNode(fontNamed: "TimeBurner")
titleLabel2.fontColor = UIColor.whiteColor()
titleLabel2.zPosition = 40
titleLabel2.fontSize = 16
titleLabel2.position = CGPointMake(self.size.width / 6.0, self.size.height / 1.25)
addChild(titleLabel2)


titleLabel = SKLabelNode(fontNamed: "TimeBurner")
titleLabel.fontColor = UIColor.whiteColor()
titleLabel.zPosition = 40
titleLabel.fontSize = 16
titleLabel.position = CGPointMake(self.size.width / 1.2, self.size.height / 1.25)
addChild(self.titleLabel)

}


  func mediaPicker(mediaPicker: MPMediaPickerController, didPickMediaItems mediaItemCollection: MPMediaItemCollection) {


  if mediaItemCollection.items.count == 2{
  mediaPicker.dismissViewControllerAnimated(true, completion: nil)

 let aMediaItem = mediaItemCollection.items[0] as MPMediaItem
 music = aMediaItem
 NSLog("\(aMediaItem.title)selected")

  let url: NSURL = (music.valueForProperty(MPMediaItemPropertyAssetURL) as?    NSURL)!

do {
    musicPlayer = try AVAudioPlayer(contentsOfURL: url)

} catch {

    return
}

    titleLabel2.text = music.title



let aMediaItem2 = mediaItemCollection.items[1] as MPMediaItem
music2 = aMediaItem2
NSLog("\(aMediaItem2.title)selected")
let url2: NSURL = (music2.valueForProperty(MPMediaItemPropertyAssetURL) as? NSURL)!

do {
    musicPlayer2 = try AVAudioPlayer(contentsOfURL: url2)

} catch {

    return
}

titleLabel.text = music2.title
addChild(self.titleLabel)

}
}

无法显示当前在Swift中播放的歌曲的标题？

1 个答案: