在使用AVAudioPlayer时，我们需要注意避免实例过度释放的问题。以下是一些解决方法的示例代码：

1. 使用strong引用来持有AVAudioPlayer实例，确保实例在使用期间不会被释放：

class ViewController: UIViewController {
    var audioPlayer: AVAudioPlayer?

    func playAudio() {
        guard let audioFilePath = Bundle.main.path(forResource: "audio", ofType: "mp3") else {
            return
        }
        let audioFileURL = URL(fileURLWithPath: audioFilePath)
        do {
            audioPlayer = try AVAudioPlayer(contentsOf: audioFileURL)
            audioPlayer?.play()
        } catch {
            print("Failed to play audio: \(error)")
        }
    }
}

2. 在合适的时机停止并释放AVAudioPlayer实例，例如在播放完成后或者不再需要时：

class ViewController: UIViewController, AVAudioPlayerDelegate {
    var audioPlayer: AVAudioPlayer?

    func playAudio() {
        guard let audioFilePath = Bundle.main.path(forResource: "audio", ofType: "mp3") else {
            return
        }
        let audioFileURL = URL(fileURLWithPath: audioFilePath)
        do {
            audioPlayer = try AVAudioPlayer(contentsOf: audioFileURL)
            audioPlayer?.delegate = self
            audioPlayer?.play()
        } catch {
            print("Failed to play audio: \(error)")
        }
    }

    func audioPlayerDidFinishPlaying(_ player: AVAudioPlayer, successfully flag: Bool) {
        audioPlayer = nil // 停止播放完成后释放实例
    }

    // 在不再需要时释放实例
    func releaseAudioPlayer() {
        audioPlayer?.stop()
        audioPlayer = nil
    }
}

通过以上方法，我们可以避免AVAudioPlayer实例过度释放的问题，并确保在正确的时机释放实例。