如何在 Swift 中按下按钮一次后播放歌曲列表

Question

我知道如何在按下屏幕上的按钮时播放一首歌曲，但不知道在歌曲完成后自动播放一首歌曲直到播放数组中的所有歌曲的歌曲数组。

有人提到使用AVQueuePlayer，但我们中的无数人不知道如何实现。你们能提供一个关于如何使用它的好示例代码吗？

我按照此视频中的代码在点击按钮时播放一首歌曲 - https://www.youtube.com/watch?v=2kflmGGMBOA

var myQueuePlayer: AVQueuePlayer?
var avItems: [AVPlayerItem] = []
func audio () {
var items: [String] = ["one", "two", "three", "four", "five"]
items.shuffle()
for clip in items {
guard let url = Bundle.main.url(forResource: clip, withExtension: ".mp3") else {
// mp3 file not found in bundle - so crash!
fatalError("Could not load (clip).mp3")
}
avItems.append(AVPlayerItem(url: url))
//button.isHidden = true
}
}

@IBAction func didTapButton() {
audio()
if myQueuePlayer == nil {
// instantiate the AVQueuePlayer with all avItems
myQueuePlayer = AVQueuePlayer(items: avItems)
print("pup1")
print(myQueuePlayer!.rate)
} else {
// stop the player and remove all avItems
myQueuePlayer?.removeAllItems()
// add all avItems back to the player
avItems.forEach {
myQueuePlayer?.insert($0, after: nil)
}
}
// seek to .zero (in case we added items back in)
myQueuePlayer?.seek(to: .zero)
// start playing
myQueuePlayer?.play()
}

Answer 1

你自己找到这个真的应该没有问题，但这里有一个非常简单的例子：

import AVFoundation
class TestAVQueuViewController: UIViewController {
var myQueuePlayer: AVQueuePlayer?
var avItems: [AVPlayerItem] = []
override func viewDidLoad() {
super.viewDidLoad()
// assuming I have 4 .mp3 files in the bundle, named:
let mySongs: [String] = [
"clip1", "clip2", "clip3", "clip4",
]
for clip in mySongs {
guard let url = Bundle.main.url(forResource: clip, withExtension: ".mp3") else {
// mp3 file not found in bundle - so crash!
fatalError("Could not load (clip).mp3")
}
avItems.append(AVPlayerItem(url: url))
}
}
@IBAction func didTap(_ sender: Any) {
// if first time
if myQueuePlayer == nil {
// instantiate the AVQueuePlayer with all avItems
myQueuePlayer = AVQueuePlayer(items: avItems)
} else {
// stop the player and remove all avItems
myQueuePlayer?.removeAllItems()
// add all avItems back to the player
avItems.forEach {
myQueuePlayer?.insert($0, after: nil)
}
}
// seek to .zero (in case we added items back in)
myQueuePlayer?.seek(to: .zero)
// start playing
myQueuePlayer?.play()
}
}

编辑

更新了代码以演示在点击按钮时播放剪辑，以及在进一步点击按钮时重新启动剪辑。