iOS 后台播放静音音频保证应用不会被无端杀掉

由于苹果推送会把一些敏感类消息外流，So 我们采用长连接试的推送服务，网上有此推送的开源项目传送门在此mpush

此开源项目很好的帮助了国内一些企业对敏感消息推送的保护，但是针对苹果端的推送有一个问题就是后台长连接的时间很短，几分钟内就会被杀掉，So 我们想到在后台放置一个循环静音（是静音啊不是无声）音频保证应用程序不会被杀掉。

此代码是swift版的有兴趣的同学可以翻译成OC

AudioManager.swift

import Foundation
import AVFoundation
@objc
open class AudioManager: NSObject {public static let shared = AudioManager()fileprivate let audioSession = AVAudioSession.sharedInstance()fileprivate var backgroundAudioPlayer: AVAudioPlayer?fileprivate var backgroundTimeLength = 0fileprivate var timer: Timer?// 是否开启后台自动播放无声音乐public var openBackgroundAudioAutoPlay = false {didSet {if self.openBackgroundAudioAutoPlay {self.setupAudioSession()self.setupBackgroundAudioPlayer()} else {if let player = self.backgroundAudioPlayer {if player.isPlaying {player.stop()}}self.backgroundAudioPlayer = niltry? self.audioSession.setActive(false, with: AVAudioSessionSetActiveOptions.notifyOthersOnDeactivation)}}}override init() {super.init()self.setupListener()}deinit {NotificationCenter.default.removeObserver(self)}private func setupAudioSession() {do {try self.audioSession.setCategory(AVAudioSessionCategoryPlayback, with: AVAudioSessionCategoryOptions.mixWithOthers)try self.audioSession.setActive(false)} catch let error {debugPrint("\(type(of:self)):\(error)")}}private func setupBackgroundAudioPlayer() {do {self.backgroundAudioPlayer = try AVAudioPlayer(contentsOf: URL(fileURLWithPath: Bundle.main.path(forResource: "wusheng1", ofType: "mp3")!))} catch let error {debugPrint("\(type(of:self)):\(error)")}self.backgroundAudioPlayer?.numberOfLoops = -1self.backgroundAudioPlayer?.volume = 0self.backgroundAudioPlayer?.delegate = self}private func setupListener() {NotificationCenter.default.addObserver(self, selector: #selector(didEnterBackground), name: Notification.Name.UIApplicationDidEnterBackground, object: nil)NotificationCenter.default.addObserver(self, selector: #selector(didBecomeActive), name: Notification.Name.UIApplicationDidBecomeActive, object: nil)NotificationCenter.default.addObserver(self, selector: #selector(audioSessionInterruption(notification:)), name: Notification.Name.AVAudioSessionInterruption, object: nil)}}
// MARK: - 扩展 监听通知
extension AudioManager {/// 进入后台 播放无声音乐@objc fileprivate func didEnterBackground() {self.setupTimer()guard self.openBackgroundAudioAutoPlay else {return}do {try self.audioSession.setActive(true)} catch let error {debugPrint("\(type(of:self)):\(error))")}self.backgroundAudioPlayer?.prepareToPlay()self.backgroundAudioPlayer?.play()}/// 进入前台，暂停播放音乐@objc fileprivate func didBecomeActive() {self.removeTimer()self.hintBackgroundTimeLength()self.backgroundTimeLength = 0guard self.openBackgroundAudioAutoPlay else {return}self.backgroundAudioPlayer?.pause()do {try self.audioSession.setActive(false, with: AVAudioSessionSetActiveOptions.notifyOthersOnDeactivation)} catch let error {debugPrint("\(type(of:self)):\(error))")}}/// 音乐中断处理@objc fileprivate func audioSessionInterruption(notification: NSNotification) {guard self.openBackgroundAudioAutoPlay else {return}guard let userinfo = notification.userInfo else {return}guard let interruptionType: UInt = userinfo[AVAudioSessionInterruptionTypeKey] as! UInt?  else {return}if interruptionType == AVAudioSessionInterruptionType.began.rawValue {// 中断开始，音乐被暂停debugPrint("\(type(of:self)): 中断开始 userinfo:\(userinfo)")} else if interruptionType == AVAudioSessionInterruptionType.ended.rawValue {// 中断结束，恢复播放debugPrint("\(type(of:self)): 中断结束 userinfo:\(userinfo)")guard let player = self.backgroundAudioPlayer else {return}if player.isPlaying == false {debugPrint("\(type(of:self)): 音乐未播放，准备开始播放")do {try self.audioSession.setActive(true)} catch let error {debugPrint("\(type(of:self)):\(error)")}player.prepareToPlay()player.play()} else {debugPrint("\(type(of:self)): 音乐正在播放")}}}
}
// MARK: - 扩展 定时器任务
extension AudioManager {fileprivate func setupTimer() {self.removeTimer()self.timer = Timer.scheduledTimer(timeInterval: 1, target: self, selector: #selector(timerTask), userInfo: nil, repeats: true)RunLoop.main.add(self.timer!, forMode: RunLoopMode.commonModes)}fileprivate func removeTimer() {self.timer?.invalidate()self.timer = nil;}@objc func timerTask() {self.backgroundTimeLength += 1}fileprivate func hintBackgroundTimeLength() {let message = "本次后台持续时间:\(self.backgroundTimeLength)s"//HintTool.hint(message)}
}// MARK: - 扩展 播放代理
extension AudioManager: AVAudioPlayerDelegate {public func audioPlayerDidFinishPlaying(_ player: AVAudioPlayer, successfully flag: Bool) {}public func audioPlayerDecodeErrorDidOccur(_ player: AVAudioPlayer, error: Error?) {debugPrint("\(type(of:self))" + error.debugDescription)}
}

HintTool.swift

import UIKitclass HintTool {private var hintView: UIView?static let shared = HintTool()static func hint(_ message: String) {self.shared.showHintView(hintView: self.hintView(with: message))}private func showHintView(hintView: UIView) {guard let window = UIApplication.shared.delegate?.window else {return}guard self.hintView == nil else {return}window!.addSubview(hintView)window!.bringSubview(toFront: hintView)self.hintView = hintView// 消失DispatchQueue.main.asyncAfter(deadline: DispatchTime.now() + 2) {[weak self] inUIView.animate(withDuration: 0.5, animations: {[weak self] inself?.hintView?.alpha = 0.5}, completion: { (finished) inself?.hintView?.removeFromSuperview()self?.hintView = nil})}}private static func hintView(with message: String) -> UIView {let minWidth = 180.0let maxWidth = 260.0let padding = 10.0let font = UIFont.systemFont(ofSize: 14)let messageSize = message.ext_size(withBoundingSize: CGSize(width: maxWidth-2*padding, height: 0) , font: font)let labelFrame = CGRect(x: 0, y: 0, width: CGFloat(ceilf(Float(messageSize.width))), height: CGFloat(ceilf(Float(messageSize.height))))let viewFrame = CGRect(x: 0, y: 0, width: max(minWidth, Double(messageSize.width) + padding*2), height: Double(messageSize.height) + padding*2)let hintView = UIView()hintView.isUserInteractionEnabled = falsehintView.backgroundColor = UIColor(white: 0, alpha: 0.7)hintView.layer.cornerRadius = 8hintView.layer.masksToBounds = truehintView.frame = viewFramehintView.center = CGPoint(x: CGFloat(ceilf(Float(UIScreen.main.bounds.size.width*0.5))), y: CGFloat(ceilf(Float(UIScreen.main.bounds.size.height-100.0))))let hintLabel = UILabel()hintView.addSubview(hintLabel)hintView.isUserInteractionEnabled = falsehintLabel.text = messagehintLabel.textColor = UIColor.whitehintLabel.textAlignment = .centerhintLabel.font = fonthintLabel.preferredMaxLayoutWidth = messageSize.widthhintLabel.numberOfLines = 0hintLabel.frame = labelFramehintLabel.center = CGPoint(x: CGFloat(ceilf(Float(hintView.bounds.size.width*0.5))), y: CGFloat(ceilf(Float(hintView.bounds.size.height*0.5))))return hintView}
}extension String {func ext_size(withBoundingSize boundingSize: CGSize, font: UIFont) -> CGSize {let option = NSStringDrawingOptions.usesLineFragmentOriginlet attributes = [NSFontAttributeName : font]let contentSize = self.boundingRect(with: boundingSize, options: option, attributes: attributes, context: nil).sizereturn contentSize}
}

使用

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {[AudioManager shared].openBackgroundAudioAutoPlay = YES;
}

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iOS 后台播放静音音频保证应用不会被无端杀掉

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