#import <Foundation/Foundation.h>@interface XKTelManager : NSObject///是否在后臺運行@property (nonatomic,assign) BOOL inBackgroundRun;+ (XKTelManager *)sharedManager;/** 來電監聽 */- (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 -********* 監聽電話相關- (void)startMonitor {  __weak typeof(self) weakSelf = self;  _callCenter = [[CTCallCenter alloc] init];  _callCenter.callEventHandler = ^(CTCall * call) {    ///如果已經進入后臺了，不做任何操作    if (weakSelf.inBackgroundRun) {      return;    }    ///APP未進入后臺    if ([call.callState isEqualToString:CTCallStateDisconnected]){      NSLog(@"電話 --- 斷開連接");      [[XKBGRunManager sharedManager] stopBGRun];    }    else if ([call.callState isEqualToString:CTCallStateConnected]){      NSLog(@"電話 --- 接通");    }    else if ([call.callState isEqualToString:CTCallStateIncoming]){      NSLog(@"電話 --- 待接通");      [[XKBGRunManager sharedManager] startBGRun];    }    else if ([call.callState isEqualToString:CTCallStateDialing]){      NSLog(@"電話 --- 撥號中");      [[XKBGRunManager sharedManager] startBGRun];    }    else {      NSLog(@"電話 --- 無操作");    }      };}@end

#import <Foundation/Foundation.h>@interface XKBGRunManager : NSObject+ (XKBGRunManager *)sharedManager;/** 開啟后臺運行 */- (void)startBGRun;/** 關閉后臺運行 */- (void)stopBGRun;@end

#import "XKBGRunManager.h"///循環時間static NSInteger _circulaDuration = 60;static XKBGRunManager *_sharedManger;@interface XKBGRunManager()@property (nonatomic,assign) UIBackgroundTaskIdentifier task;///后臺播放@property (nonatomic,strong) AVAudioPlayer *playerBack;@property (nonatomic, strong) NSTimer *timerAD;///用來打印測試@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init方法，初始化音樂文件- (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,默認為1.0    self.playerBack.volume = 0.01;    // 循環播放    self.playerBack.numberOfLoops = -1;  }  return self;}- (void)setupAudioSession {  // 新建AudioSession會話  AVAudioSession *audioSession = [AVAudioSession sharedInstance];  // 設置后臺播放  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AudioSession，如果一個前臺app正在播放音頻則可能會啟動失敗  [audioSession setActive:YES error:&activeSetError];  if (activeSetError) {    NSLog(@"Error activating AVAudioSession: %@", activeSetError);  }}/** 啟動后臺運行 */- (void)startBGRun{  [self.playerBack play];  [self applyforBackgroundTask];  ///確保兩個定時器同時進行  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();  });}/** 申請后臺 */- (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)}/** 檢測后臺運行時間 */- (void)startAudioPlay{  _count = 0;  dispatch_async(dispatch_get_main_queue(), ^{    if ([[UIApplication sharedApplication] backgroundTimeRemaining] < 61.0) {      NSLog(@"后臺快被殺死了");      [self.playerBack play];      [self applyforBackgroundTask];    }    else{      NSLog(@"后臺繼續活躍呢");    }///再次執行播放器停止，后臺一直不會播放音樂文件    [self.playerBack stop];  });}/** 停止后臺運行 */- (void)stopBGRun{  if (self.timerAD) {    CFRunLoopStop(_runloopRef);    [self.timerLog invalidate];    self.timerLog = nil;    // 關閉定時器即可    [self.timerAD invalidate];    self.timerAD = nil;    [self.playerBack stop];  }  if (_task) {    [[UIApplication sharedApplication] endBackgroundTask:_task];    _task = UIBackgroundTaskInvalid;  }}@end