前言

iOS有两种后台运行保活方式，第一种叫无声音乐保活（即在后台开启音频播放，只不过不需要播放出音量且不能影响其他音乐播发软件），第二种叫Background Task，但是这种方法在iOS 13以后只能申请短短的30秒钟时间，但是在iOS7-iOS13以前是可以申请到3分钟的保活时间的，当然我们也可以经过处理来申请到更多的保活时间。

无声音乐保活

(1)打开应用的Target页面Signing & Cabailities，添加Capability（Background Modes）勾选Audio，AirPlay，and Picture in Picture选项

(2)我们需要监听UIApplicationWillEnterForegroundNotification（应用进入前台通知）和UIApplicationDidEnterBackgroundNotification（应用进入后台通知）

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(appWillEnterForeground) name:UIApplicationWillEnterForegroundNotification object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(appDidEnterBackground) name:UIApplicationDidEnterBackgroundNotification object:nil];
- (void)appWillEnterForeground {}- (void)appDidEnterBackground {}

(3)编写音乐播放类
BackgroundPlayer.h

#import <Foundation/Foundation.h>
#import <AVFoundation/AVFoundation.h>@interface BackgroundPlayer : NSObject <AVAudioPlayerDelegate>
{AVAudioPlayer* _player;
}
- (void)startPlayer;- (void)stopPlayer;
@end

BackgroundPlayer.m

#import "BackgroundPlayer.h"@implementation BackgroundPlayer- (void)startPlayer
{if (_player && [_player isPlaying]) {return;}AVAudioSession *session = [AVAudioSession sharedInstance];[[AVAudioSession sharedInstance] setMode:AVAudioSessionModeDefault error:nil];NSString* route = [[[[[AVAudioSession sharedInstance] currentRoute] outputs] objectAtIndex:0] portType];if ([route isEqualToString:AVAudioSessionPortHeadphones] || [route isEqualToString:AVAudioSessionPortBluetoothA2DP] || [route isEqualToString:AVAudioSessionPortBluetoothLE] || [route isEqualToString:AVAudioSessionPortBluetoothHFP]) {if (@available(iOS 10.0, *)) {[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayAndRecordwithOptions:(AVAudioSessionCategoryOptionMixWithOthers | AVAudioSessionCategoryOptionAllowBluetooth | AVAudioSessionCategoryOptionAllowBluetoothA2DP)error:nil];} else {// Fallback on earlier versions}}else{[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayAndRecordwithOptions:(AVAudioSessionCategoryOptionMixWithOthers | AVAudioSessionCategoryOptionDefaultToSpeaker)error:nil];}[session setActive:YES error:nil];NSURL *url = [[NSBundle bundleWithPath:WECAST_CLOUD_BUNDLE_PATH]URLForResource:@"你的音乐资源" withExtension:nil];_player = [[AVAudioPlayer alloc] initWithContentsOfURL:url error:nil];[_player prepareToPlay];[_player setDelegate:self];_player.numberOfLoops = -1;BOOL ret = [_player play];if (!ret) {NSLog(@"play failed,please turn on audio background mode");}
}- (void)stopPlayer
{if (_player) {[_player stop];_player = nil;AVAudioSession *session = [AVAudioSession sharedInstance];[session setActive:NO error:nil];NSLog(@"stop in play background success");}
}@end

(4)在应用进入后台时开启保活

@property (nonatomic, strong) BackgroundPlayer* player;
- (void)appWillEnterForeground {if (self.player) {[self.player stopPlayBackgroundAlive];}
}- (void)appDidEnterBackground {if (_player == nil) {_player = [[BackgroundPlayer alloc] init];}[self.player startPlayer];
}

Background Task保活

(1)同样我们需要监听UIApplicationWillEnterForegroundNotification（应用进入前台通知）和UIApplicationDidEnterBackgroundNotification（应用进入后台通知）

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(appWillEnterForeground) name:UIApplicationWillEnterForegroundNotification object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(appDidEnterBackground) name:UIApplicationDidEnterBackgroundNotification object:nil];
- (void)appWillEnterForeground {}- (void)appDidEnterBackground {}

(2)使用Background Task申请保活时间，在应用进入后台时开启保活，在应用进入前台时关闭保活

@property (assign, nonatomic) UIBackgroundTaskIdentifier backgroundId;
- (void)appWillEnterForeground {[self stopKeepAlive];
}- (void)appDidEnterBackground {_backgroundId = [[UIApplication sharedApplication] beginBackgroundTaskWithExpirationHandler:^{//申请的时间即将到时回调该方法NSLog(@"BackgroundTask time gone");[self stopKeepAlive];}];
}- (void)stopKeepAlive{if (_backgroundId) {[[UIApplication sharedApplication] endBackgroundTask:_backgroundId];_backgroundId = UIBackgroundTaskInvalid;}
}

(3)使用NSTimer循环申请保活时间，但是建议不要无限申请保活时间，因为系统如果发现该应用一直在后台运行时，是可能会直接crash掉你的应用的，错误码0x8badf00d

//开启定时器 不断向系统请求后台任务执行的时间
NSTimer *_timer = [NSTimer scheduledTimerWithTimeInterval:5 target:self selector:@selector(applyForMoreTime) userInfo:nil repeats:YES];
[_timer fire];//在这里我判断了申请次数，加上第一次申请保活时间的次数一共6次。
@property(nonatomic,assign) int applyTimes;
-(void)applyForMoreTime {if ([UIApplication sharedApplication].backgroundTimeRemaining < 10) {_applyTimes += 1;NSLog(@"Try to apply for more time:%d",_applyTimes);[[UIApplication sharedApplication] endBackgroundTask:_backIden];_backIden = [[UIApplication sharedApplication] beginBackgroundTaskWithExpirationHandler:^{[self stopKeepAlive];}];if(_applyTimes == 5){[_timer invalidate];_applyTimes = 0;[self stopKeepAlive];}}
}

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iOS 后台运行保活

前言

无声音乐保活

Background Task保活

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