Swift Xcode中SwiftySound音频叠加播放问题求助

Hey there! I’ve run into this exact annoying overlap issue with SwiftySound before—nothing ruins an app’s vibe like layered background tracks when navigating screens. Let’s walk through a few solid solutions to get this sorted:

1. Use a Singleton Audio Manager (Recommended) #

The cleanest way to avoid duplicate playback is to centralize your audio logic into a singleton. This ensures only one instance of your background music ever plays, no matter how many times you trigger the play command across different screens.

Here’s how to set it up:

import SwiftySound

class AudioManager {
    // Singleton instance—only one exists across the app
    static let shared = AudioManager()
    private var backgroundTrack: Sound?
    
    // Prevent external code from creating new instances
    private init() {}
    
    func startBackgroundMusic() {
        // Only play if the track isn’t already running
        guard backgroundTrack?.isPlaying != true else { return }
        
        backgroundTrack = Sound.play(
            file: "bensound-summer",
            fileExtension: "mp3",
            numberOfLoops: -1
        )
    }
    
    func stopBackgroundMusic() {
        backgroundTrack?.stop()
        backgroundTrack = nil
    }
}

Then update your viewDidLoad code to use the manager:

override func viewDidLoad() {
    super.viewDidLoad()
    AudioManager.shared.startBackgroundMusic()
}

Now, no matter which screen calls startBackgroundMusic(), it’ll only kick off the track once.

2. Check Playback State Before Playing #

If you don’t want to set up a singleton, you can directly check if SwiftySound has active playback before triggering a new play command:

override func viewDidLoad() {
    super.viewDidLoad()
    
    // Only start the track if no audio is currently playing
    if !Sound.isPlaying() {
        Sound.play(
            file: "bensound-summer",
            fileExtension: "mp3",
            numberOfLoops: -1
        )
    }
}

Note: This checks all active SwiftySound instances, so use this only if you’re only playing one audio track at a time (no sound effects overlapping with background music).

3. Stop Audio When Leaving the Screen (If Needed) #

If you want the music to stop when navigating away (and restart when returning), add this to your view controller:

override func viewWillDisappear(_ animated: Bool) {
    super.viewWillDisappear(animated)
    Sound.stopAll()
}

This works great if each screen has its own unique background track, but isn’t ideal if you want continuous music across screens.

Bonus: Initialize Music in App/Scene Delegate #

For truly persistent background music that runs across your entire app lifecycle, initialize it in your SceneDelegate (or AppDelegate for older projects) instead of individual view controllers:

func sceneDidBecomeActive(_ scene: UIScene) {
    AudioManager.shared.startBackgroundMusic()
}

This way, the music starts when the app becomes active and won’t restart every time you push a new view controller.

内容的提问来源于stack exchange，提问作者MasonPK