测试设备：iPhone 13mini / iOS 26

验证方法

1. 开启Audio, AirPlay, and Picture in Picture模式，播放声音
2. 执行与声音无关的代码和网络请求逻辑，并写入日志文件，代码如下所示
3. 让App进入后台，App持续播放声音，过一段时间（5分钟）回到App前台，检查日志文件中是否预期内容

private func test() {
    var sum = 0
    timer?.invalidate()
    timer = YYTimer(timeInterval: 1, repeats: true, block: { t in
        sum += 1
                
        // 验证代码执行
        DDLogInfo("[BackgroundTest] Timer fired. Sum: \(sum)")
                
        // 验证网络请求
        let url = URL(string: "https://www.baidu.com")!
        URLSession.shared.dataTask(with: url) { _, response, error in
            if let error = error {
                DDLogInfo("[BackgroundTest] Network failed: \(error.localizedDescription)")
            } else if let httpResponse = response as? HTTPURLResponse {
                DDLogInfo("[BackgroundTest] Network success. Status: \(httpResponse.statusCode)")
            }
        }.resume()
    })
}

日志结果：

2025-11-27 10:23:13.575 [INFO] [BackgroundTest] Timer fired. Sum: 5
2025-11-27 10:23:13.612 [INFO] [BackgroundTest] Network success. Status: 200
2025-11-27 10:23:14.008 [INFO] Report OnlineStatus background, badge number 1 // 进入后台
2025-11-27 10:23:14.582 [INFO] [BackgroundTest] Timer fired. Sum: 6
2025-11-27 10:23:14.612 [INFO] [BackgroundTest] Network success. Status: 200
2025-11-27 10:23:15.586 [INFO] [BackgroundTest] Timer fired. Sum: 7
2025-11-27 10:23:15.622 [INFO] [BackgroundTest] Network success. Status: 200
.....//省略
2025-11-27 10:28:19.578 [INFO] [BackgroundTest] Timer fired. Sum: 311
2025-11-27 10:28:19.610 [INFO] [BackgroundTest] Network success. Status: 200
2025-11-27 10:28:20.579 [INFO] [BackgroundTest] Timer fired. Sum: 312
2025-11-27 10:28:20.611 [INFO] [BackgroundTest] Network success. Status: 200
2025-11-27 10:28:21.574 [INFO] [BackgroundTest] Timer fired. Sum: 313
2025-11-27 10:28:21.602 [INFO] [BackgroundTest] Network success. Status: 200
2025-11-27 10:28:22.449 [INFO] Report OnlineStatus foreground                 // 回到前台
2025-11-27 10:28:22.573 [INFO] [BackgroundTest] Timer fired. Sum: 314
2025-11-27 10:28:22.600 [INFO] [BackgroundTest] Network success. Status: 200

结论

• 开启Audio, AirPlay, and Picture in Picture模式，开启声音，进入后台，可以正常执行与声音无关的代码逻辑和网络请求

注：仅为测试结果，不排除系统会做任何形式的拦截或中断