#import <Foundation/Foundation.h>

@interface XKTelManager : NSObject
///是否在后臺(tái)運(yùn)行
@property (nonatomic,assign) BOOL inBackgroundRun;
+ (XKTelManager *)sharedManager;
/**
 來(lái)電監(jiān)聽(tīng)
 */
- (void)startMonitor;
@end

#import "XKTelManager.h"
#import "XKBGRunManager.h"
#import <CoreTelephony/CTCallCenter.h>
#import <CoreTelephony/CTCall.h>

static XKTelManager *_sharedManger;
@interface XKTelManager()
@property (nonatomic, strong) CTCallCenter *callCenter;
@end
@implementation XKTelManager
+ (XKTelManager *)sharedManager{
  static dispatch_once_t onceTelSingle;
  dispatch_once(&onceTelSingle, ^{
    if (!_sharedManger) {
      _sharedManger = [[XKTelManager alloc]init];
    }
  });
  return _sharedManger;
}
- (instancetype)init{
  self = [super init];
  if (self) {
    _inBackgroundRun = NO;
  }
  return self;
}
#pragma mark -********* 監(jiān)聽(tīng)電話(huà)相關(guān)
- (void)startMonitor {
  __weak typeof(self) weakSelf = self;
  _callCenter = [[CTCallCenter alloc] init];
  _callCenter.callEventHandler = ^(CTCall * call) {
    ///如果已經(jīng)進(jìn)入后臺(tái)了，不做任何操作
    if (weakSelf.inBackgroundRun) {
      return;
    }
    ///APP未進(jìn)入后臺(tái)
    if ([call.callState isEqualToString:CTCallStateDisconnected]){
      NSLog(@"電話(huà) --- 斷開(kāi)連接");
      [[XKBGRunManager sharedManager] stopBGRun];
    }
    else if ([call.callState isEqualToString:CTCallStateConnected]){
      NSLog(@"電話(huà) --- 接通");
    }
    else if ([call.callState isEqualToString:CTCallStateIncoming]){
      NSLog(@"電話(huà) --- 待接通");
      [[XKBGRunManager sharedManager] startBGRun];
    }
    else if ([call.callState isEqualToString:CTCallStateDialing]){
      NSLog(@"電話(huà) --- 撥號(hào)中");
      [[XKBGRunManager sharedManager] startBGRun];
    }
    else {
      NSLog(@"電話(huà) --- 無(wú)操作");
    }
    
  };
}
@end

#import <Foundation/Foundation.h>

@interface XKBGRunManager : NSObject
+ (XKBGRunManager *)sharedManager;

/**
 開(kāi)啟后臺(tái)運(yùn)行
 */
- (void)startBGRun;

/**
 關(guān)閉后臺(tái)運(yùn)行
 */
- (void)stopBGRun;
@end

#import "XKBGRunManager.h"
///循環(huán)時(shí)間
static NSInteger _circulaDuration = 60;
static XKBGRunManager *_sharedManger;
@interface XKBGRunManager()
@property (nonatomic,assign) UIBackgroundTaskIdentifier task;
///后臺(tái)播放
@property (nonatomic,strong) AVAudioPlayer *playerBack;
@property (nonatomic, strong) NSTimer *timerAD;
///用來(lái)打印測(cè)試
@property (nonatomic, strong) NSTimer *timerLog;
@property (nonatomic,assign) NSInteger count;
@end
@implementation XKBGRunManager{
  CFRunLoopRef _runloopRef;
  dispatch_queue_t _queue;
}
+ (XKBGRunManager *)sharedManager{
  static dispatch_once_t onceRunSingle;
  dispatch_once(&onceRunSingle, ^{
    if (!_sharedManger) {
      _sharedManger = [[XKBGRunManager alloc]init];
    }
  });
  return _sharedManger;
}
/// 重寫(xiě)init方法，初始化音樂(lè)文件
- (instancetype)init {
  if (self = [super init]) {
    [self setupAudioSession];
    _queue = dispatch_queue_create("com.audio.inBackground", NULL);
    //靜音文件
    NSString *filePath = [[NSBundle mainBundle] pathForResource:@"****" ofType:@"mp3"];
    NSURL *fileURL = [[NSURL alloc] initFileURLWithPath:filePath];
    self.playerBack = [[AVAudioPlayer alloc] initWithContentsOfURL:fileURL error:nil];
    [self.playerBack prepareToPlay];
    // 0.0~1.0,默認(rèn)為1.0
    self.playerBack.volume = 0.01;
    // 循環(huán)播放
    self.playerBack.numberOfLoops = -1;
  }
  return self;
}

- (void)setupAudioSession {
  // 新建AudioSession會(huì)話(huà)
  AVAudioSession *audioSession = [AVAudioSession sharedInstance];
  // 設(shè)置后臺(tái)播放
  NSError *error = nil;
  [audioSession setCategory:AVAudioSessionCategoryPlayback withOptions:AVAudioSessionCategoryOptionMixWithOthers error:&error];
  if (error) {
    NSLog(@"Error setCategory AVAudioSession: %@", error);
  }
  NSLog(@"%d", audioSession.isOtherAudioPlaying);
  NSError *activeSetError = nil;
  // 啟動(dòng)AudioSession，如果一個(gè)前臺(tái)app正在播放音頻則可能會(huì)啟動(dòng)失敗
  [audioSession setActive:YES error:&activeSetError];
  if (activeSetError) {
    NSLog(@"Error activating AVAudioSession: %@", activeSetError);
  }
}

/**
 啟動(dòng)后臺(tái)運(yùn)行
 */
- (void)startBGRun{
  [self.playerBack play];
  [self applyforBackgroundTask];
  ///確保兩個(gè)定時(shí)器同時(shí)進(jìn)行
  dispatch_async(_queue, ^{
    self.timerLog = [[NSTimer alloc] initWithFireDate:[NSDate date] interval:1 target:self selector:@selector(log) userInfo:nil repeats:YES];
    self.timerAD = [[NSTimer alloc] initWithFireDate:[NSDate date] interval:_circulaDuration target:self selector:@selector(startAudioPlay) userInfo:nil repeats:YES];
    _runloopRef = CFRunLoopGetCurrent();
    [[NSRunLoop currentRunLoop] addTimer:self.timerAD forMode:NSDefaultRunLoopMode];
    [[NSRunLoop currentRunLoop] addTimer:self.timerLog forMode:NSDefaultRunLoopMode];
    CFRunLoopRun();
  });
}

/**
 申請(qǐng)后臺(tái)
 */
- (void)applyforBackgroundTask{
  _task =[[UIApplication sharedApplication] beginBackgroundTaskWithExpirationHandler:^{
    dispatch_async(dispatch_get_main_queue(), ^{
      [[UIApplication sharedApplication] endBackgroundTask:_task];
      _task = UIBackgroundTaskInvalid;
    });
  }];
}

/**
 打印
 */
- (void)log{
  _count = _count + 1;
  NSLog(@"_count = %ld",_count)
}

/**
 檢測(cè)后臺(tái)運(yùn)行時(shí)間
 */
- (void)startAudioPlay{
  _count = 0;
  dispatch_async(dispatch_get_main_queue(), ^{
    if ([[UIApplication sharedApplication] backgroundTimeRemaining] < 61.0) {
      NSLog(@"后臺(tái)快被殺死了");
      [self.playerBack play];
      [self applyforBackgroundTask];
    }
    else{
      NSLog(@"后臺(tái)繼續(xù)活躍呢");
    }///再次執(zhí)行播放器停止，后臺(tái)一直不會(huì)播放音樂(lè)文件
    [self.playerBack stop];
  });
}

/**
 停止后臺(tái)運(yùn)行
 */
- (void)stopBGRun{
  if (self.timerAD) {
    CFRunLoopStop(_runloopRef);
    [self.timerLog invalidate];
    self.timerLog = nil;
    // 關(guān)閉定時(shí)器即可
    [self.timerAD invalidate];
    self.timerAD = nil;
    [self.playerBack stop];
  }
  if (_task) {
    [[UIApplication sharedApplication] endBackgroundTask:_task];
    _task = UIBackgroundTaskInvalid;
  }
}

@end