在 swift 2.0 中暂停 mp3 文件

Question

我有一个问题：我想创建一个暂停按钮，当我选择一首新歌时 => 当前歌曲将停止并播放新歌。我是 swift 的新手，所以我希望你能帮助我提供完整的代码。非常感谢

这是我的代码：

import UIKit
import AVFoundation
class ChiTietViewController: UIViewController {
var thamsoTruyen:NSUserDefaults!


override func viewDidLoad() {
    super.viewDidLoad()
    self.view.backgroundColor = UIColor(patternImage: UIImage(named: "nen.jpg")!)
    thamsoTruyen = NSUserDefaults()
    var myplayer:AVPlayer!
    var playeritem: AVPlayerItem!
    var row:Int = thamsoTruyen.objectForKey("number") as! Int
    var url:NSURL = NSURL(string:"http://ozz4u.com/danhsach.php?cot=mp3")!
    var ds:NSString!
    do{
        ds = try NSString(contentsOfURL: url, encoding: NSUTF8StringEncoding)
    } catch{
    }
    var chuoi:[String] = ds.componentsSeparatedByString("#") as [String]

    var error:NSError? = nil
    var u:NSURL = NSURL(string: chuoi[row])!
    playeritem = AVPlayerItem(URL: u)
    myplayer = AVPlayer(playerItem: playeritem)
    let playerlayer = AVPlayerLayer(player: myplayer)
    playerlayer.frame = CGRectMake(0, 0, 10, 15)
    self.view.layer.addSublayer(playerlayer)
    myplayer.play()

}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()

}

Answer 1

您的代码中有很多基础知识错误，因此我建议您多阅读一些教程，尤其是 swift 基础文档。

我为您突出显示了它们，老实说，在您对 swift 基础知识更加熟悉之前，我认为继续您正在做的事情不是一个好主意。

import UIKit
import AVFoundation
class ChiTietViewController: UIViewController {

  //var thamsoTruyen:NSUserDefaults!  //BAD CODE, ALSO BAD NAMING
  let localDefaults = NSUserDefaults.standardUserDefaults()


       override func viewDidLoad() {
       super.viewDidLoad()

       self.view.backgroundColor = UIColor(patternImage: UIImage(named: "nen.jpg")!)
//thamsoTruyen = NSUserDefaults() // BAD CODE, Delete. Also not calling standardUserDefaults.
//var my player:AVPlayer! // BAD CODE, Make no sense so delete. This would make only sense if you put it above "ViewDidLoad" so you can use it across your whole class.
//var playeritem: AVPlayerItem! // See above

 var row:Int = thamsoTruyen.objectForKey("number") as! Int // BAD CODE, You are not checking if the object exists but are forcing it to be an Int, which can cause a nil crash. Also you might as well use IntegerForKey when your value is an INT. 

var row = localDefaults.integerForKey("number)" // Better option than above

var url:NSURL = NSURL(string:"http://ozz4u.com/danhsach.php?cot=mp3")!
var ds:NSString! // Make this optional?
do{
    ds = try NSString(contentsOfURL: url, encoding: NSUTF8StringEncoding)
} catch{

   // NOT CATCHING ERROR HERE, DANGEROUS 
}
var chuoi:[String] = ds.componentsSeparatedByString("#") as [String]

var error:NSError? = nil
var u:NSURL = NSURL(string: chuoi[row])! // Force unwrapping so you better make sure the array exists.

let playeritem = AVPlayerItem(URL: u)
let myplayer = AVPlayer(playerItem: playeritem)
let playerlayer = AVPlayerLayer(player: myplayer)
playerlayer.frame = CGRectMake(0, 0, 10, 15)
self.view.layer.addSublayer(playerlayer)
myplayer.play()

}

现在，如果您仍在寻找问题的答案，请在 gitHub 上查看我的助手，它非常简单，并向您展示了如何暂停歌曲等。

https://github.com/crashoverride777/Swift2-Music-Helper

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