UIWebView在应用程序转到后台时播放音频

import AVFoundation

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

    var window: UIWindow?

    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
        // 其他初始化代码
        return true
    }

    func applicationDidEnterBackground(_ application: UIApplication) {
        // 后台播放音频
        let audioSession = AVAudioSession.sharedInstance()
        do {
            try audioSession.setCategory(.playback, mode: .default, options: .mixWithOthers)
            try audioSession.setActive(true)
        } catch {
            print("Failed to set audio session category.")
        }
    }

    func applicationWillEnterForeground(_ application: UIApplication) {
        // 恢复到前台，停止后台播放音频
        let audioSession = AVAudioSession.sharedInstance()
        do {
            try audioSession.setActive(false)
        } catch {
            print("Failed to deactivate audio session.")
        }
    }

    // 其他AppDelegate方法
}