zuoyebang/tongxin/VC/WatchHome/DeviceInfo/CallVideo/1v1/JuPhoonCallViewController.m

//
//  JuPhoonCallViewController.m
//  watch
//
//  Created by Apple on 2019/4/29.
//  Copyright © 2019年 xTT. All rights reserved.
//
//ios 4~10
#import <CoreTelephony/CTCallCenter.h>
#import <CoreTelephony/CTCall.h>

//ios > 10 remove by lsz 2020-12-22
//#import <CallKit/CXCallObserver.h>
//#import <CallKit/CXCall.h>

#import "JuPhoonCallViewController.h"
#import "User.h"
#import "Device.h"
#import "JCManager.h"
#import <JLAuthorizationManager.h>
#import "AppDelegate.h"


/*CXCallObserverDelegate*/
@interface JuPhoonCallViewController ()
{
    AVAudioPlayer *audioPlayer;
    int wait_duration;
    NSInteger tempElapsed ;
    BOOL hangUping;
    
    
    CTCallCenter *callCenter_old;
    //CXCallObserver *callObserver;
}


/**
 控制 挂断 和 接听的 容器
 */
@property (weak, nonatomic) IBOutlet UIStackView *buttonStackView;
/**
 主动挂断按钮 View
 */
@property (weak, nonatomic) IBOutlet UIView *activeHangupView;

/**
 右侧按钮的 容器 View
 */
@property (weak, nonatomic) IBOutlet UIView *rightBtnView;

/// 转换摄像头(视频)   免提 (语音)
@property (weak, nonatomic) IBOutlet UILabel *rightBtnDesLabel;

/// 转换摄像头的图像按钮(视频)   免提的图像按钮 (语音)
@property (weak, nonatomic) IBOutlet UIButton *rightBtn;

/**
 静音按钮 容器View
 */
@property (weak, nonatomic) IBOutlet UIView *muteBtnView;



/**
 被动挂断按钮 View
 */
@property (weak, nonatomic) IBOutlet UIView *hangupView;

/**
 接听按钮 View
 */
@property (weak, nonatomic) IBOutlet UIView *acceptView;




@property (strong, nonatomic) NSTimer *callDurationTimer;

@property (weak, nonatomic) IBOutlet UILabel *timeLabel;

/**
 是否是接通状态
 */
@property (nonatomic) BOOL isCall;

@property (weak, nonatomic) IBOutlet UIImageView *headImageView;

@property (weak, nonatomic) IBOutlet UILabel *nameLabel;

@property (weak, nonatomic) IBOutlet UIView *backView;


/// 是否未打开麦克风
@property (nonatomic) BOOL isUNAuthorizationTypeAudio;

/// 是否未打开相机
@property (nonatomic) BOOL isUNAuthorizationTypeCamera;


@end

@implementation JuPhoonCallViewController

-(BOOL)shouldAutorotate{
    return NO;
}

- (void)judgeAuthorization{
    if(self.isUNAuthorizationTypeCamera == YES){
        [self showAlertAuthorizationTypeCamera];
        if(self.isReceiveCall){
            [self activeHangUpBtnAction:nil];
        }else{
            [self hangUpButton:nil];
        }
    }else if(self.isUNAuthorizationTypeAudio == YES){
        [self showAlertAuthorizationTypeVideo];
        if(self.isReceiveCall){
            [self activeHangUpBtnAction:nil];
        }else{
            [self hangUpButton:nil];
        }
    }
}
- (void)viewDidLoad {
    [super viewDidLoad];
    
    WEAKSELF
    if ([UIApplication sharedApplication].applicationState != UIApplicationStateActive){
        //当处于非前台时
        [[NSNotificationCenter defaultCenter] addObserverForName:UIApplicationDidBecomeActiveNotification object:nil queue:[NSOperationQueue mainQueue] usingBlock:^(NSNotification * _Nonnull note) {
            //当从后台变为前台时收到的通知
            [weakSelf judgeAuthorization];
            
        }];
    }
    
    JLAuthorizationManager *jlManager = [JLAuthorizationManager defaultManager];
    [jlManager JL_requestAuthorizationWithAuthorizationType:JLAuthorizationTypeAudio
                                          authorizedHandler:nil
                                        unAuthorizedHandler:^{
        weakSelf.isUNAuthorizationTypeAudio = YES;
        
    }];
    [jlManager JL_requestAuthorizationWithAuthorizationType:JLAuthorizationTypeVideo
                                              authorizedHandler:nil
                                            unAuthorizedHandler:^{
        weakSelf.isUNAuthorizationTypeCamera = YES;
    }];
    
    
//    MARK: 处理来电接听挂断
    if([UIDevice currentDevice].systemVersion.floatValue > 10.0){
        //callObserver= [CXCallObserver new];
        //[callObserver setDelegate:self queue:dispatch_get_main_queue()];
    }else{
        callCenter_old= [CTCallCenter new];
        WEAKSELF
        callCenter_old.callEventHandler = ^(CTCall *call) {
            dispatch_async(dispatch_get_main_queue(), ^{
                if ([call.callState isEqualToString:CTCallStateDialing]) {
                    xLog(@"电话主动拨打电话");
                } else if ([call.callState isEqualToString:CTCallStateConnected]) {
                    xLog(@"电话接通");
                    [weakSelf activeHangUpBtnAction:nil];
                } else if ([call.callState isEqualToString:CTCallStateDisconnected]) {
                    xLog(@"电话挂断");
                    
                } else if ([call.callState isEqualToString:CTCallStateIncoming]) {
                    xLog(@"电话被叫");
                } else {
                    xLog(@"电话其他状态");
                }
            });
        };
    }
    
    
    
    
    [self initUI];
    
    //订阅状态接收的通知
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(updateUI:) name:kCallNotification object:nil];
    
    
}
-(void)showAlertAuthorizationTypeVideo{
    
    LGAlertView *alertView = [[LGAlertView alloc] initWithTitle:[NSString stringWithFormat:@"请在iPhone的\"设置-隐私-麦克风\"选项中,允许%@访问你的麦克风",APPName] message:nil style:LGAlertViewStyleAlert buttonTitles:@[@"确定"] cancelButtonTitle:@"" destructiveButtonTitle:nil  actionHandler:^(LGAlertView *alertView, NSString *title, NSUInteger index) {
                                                    
        //[[UIApplication sharedApplication] openURL:[NSURL URLWithString:UIApplicationOpenSettingsURLString]];
        
    } cancelHandler:^(LGAlertView *alertView) {
        
    } destructiveHandler:nil];
    [alertView showAnimated:YES completionHandler:nil];
}
-(void)showAlertAuthorizationTypeCamera{
    LGAlertView *alertView = [[LGAlertView alloc] initWithTitle:[NSString stringWithFormat:@"请在iPhone的\"设置-隐私-相机\"选项中,允许%@访问你的相机",APPName] message:nil style:LGAlertViewStyleAlert buttonTitles:@[@"确定"] cancelButtonTitle:@"" destructiveButtonTitle:nil  actionHandler:^(LGAlertView *alertView, NSString *title, NSUInteger index) {
        
        
    } cancelHandler:^(LGAlertView *alertView) {
        
    } destructiveHandler:nil];
    [alertView showAnimated:YES completionHandler:nil];
}

#pragma mark ---- CXCallObserverDelegate----
//- (void)callObserver:(CXCallObserver *)callObserver callChanged:(CXCall *)call{
//    NSLog(@"outgoing :%d  onHold :%d   hasConnected :%d   hasEnded :%d",call.outgoing,call.onHold,call.hasConnected,call.hasEnded);
    /*
     拨打:  outgoing :1  onHold :0   hasConnected :0   hasEnded :0
     拒绝:  outgoing :1  onHold :0   hasConnected :0   hasEnded :1
     链接:  outgoing :1  onHold :0   hasConnected :1   hasEnded :0
     挂断:  outgoing :1  onHold :0   hasConnected :1   hasEnded :1
     对方未接听时挂断：  outgoing :1  onHold :0   hasConnected :0   hasEnded :1
     
     新来电话:    outgoing :0  onHold :0   hasConnected :0   hasEnded :0
     保留并接听:  outgoing :1  onHold :1   hasConnected :1   hasEnded :0
     另一个挂掉:  outgoing :0  onHold :0   hasConnected :1   hasEnded :0
     保持链接:    outgoing :1  onHold :0   hasConnected :1   hasEnded :1
     对方挂掉:    outgoing :0  onHold :0   hasConnected :1   hasEnded :1
     */
    //接通 另一个挂掉
    //if (!call.outgoing && !call.onHold && call.hasConnected && !call.hasEnded) {
    //    [self activeHangUpBtnAction:nil];
    //}
//}

- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];
    //强制亮屏
    [[UIApplication sharedApplication] setIdleTimerDisabled:YES];
    if ([UIApplication sharedApplication].applicationState == UIApplicationStateActive){
        [self judgeAuthorization];
    }
}

- (void)viewWillDisappear:(BOOL)animated
{
    [super viewWillDisappear:animated];
    //取消强制亮屏
    [[UIApplication sharedApplication] setIdleTimerDisabled:NO];
    [self stopRing];
    [self _stopCallDurationTimer];
    self.nameLabel.text = nil;
    self.timeLabel.text = nil;
    
    //if(callObserver){
    //    [callObserver setDelegate:nil queue:dispatch_get_main_queue()];
    //    callObserver = nil;
    //}
    
    if(callCenter_old){
        [callCenter_old setCallEventHandler:nil];
        callCenter_old = nil;
    }
//    [[JCManager shared].client logout];
}

-(void)initUI{
    //等待时的图片
    //判断性别
    NSString *sexImageName ;
    if([cUser.cDevice.sex isEqualToString:@"girl"]){
        //女
        sexImageName = @"icon_girl_head_portrait";
        
    }else{
        //男
        sexImageName = @"icon_boy_head_portrait";
    }
    [self.headImageView sd_setImageWithURL:[NSURL URLWithString:self.device.avator]
                     placeholderImage:[myHelper getImageWithName:sexImageName]
                              options:SDWebImageRetryFailed];
    self.nameLabel.text = self.device.name;
    self.timeLabel.hidden = YES;
    self.statusLabel.hidden = YES;
    
    NSString * music = @"ring";
    if(self.isReceiveCall){
        //呼入
        music = @"ring";
        //隐藏 主动挂断按钮
        self.activeHangupView.hidden = YES;
        self.hangupView.hidden = NO;
        self.acceptView.hidden = NO;
    }else{
        //呼出
        music = @"tones";
        //显示 主动挂断按钮
        self.activeHangupView.hidden = NO;
        self.hangupView.hidden = YES;
        self.acceptView.hidden = YES;
    }
    //如果是在后台的情况,不响铃
    if([UIApplication sharedApplication].applicationState != UIApplicationStateBackground){
        dispatch_async(dispatch_get_main_queue(), ^{
            [self playRing:music];
        });
    }
    
    self.muteBtnView.hidden = YES;
    self.rightBtnView.hidden = YES;
}


-(void)updateUI:(NSNotification *)noti{
    //振铃
    
    self.timeLabel.hidden = YES;
    JCCallItem *activeCall = [self getActiveCall];
    
    if (activeCall.state == JCCallStatePending) {
        
    } else if (activeCall.state == JCCallStateTalking) {
        //通话中
        [self stopRing];
        [JCManager.shared.mediaDevice startAudio];
//        xLog(@"--------------------音频输出是否是扬声器 :JCManager.shared.mediaDevice.speakerOn : %d",JCManager.shared.mediaDevice.speakerOn)
        
        if(!self.callDurationTimer){
            [self _startCallDurationTimer];
        }
        self.timeLabel.hidden = NO;
        
        
        self.statusLabel.hidden = YES;
        //显示主动挂断
        self.activeHangupView.hidden = NO;
        //隐藏 接听和被动挂断
        self.hangupView.hidden = YES;
        self.acceptView.hidden = YES;
        //显示 静音
        self.muteBtnView.hidden = NO;
        
        if (activeCall.video) {
            self.nameLabel.hidden = YES;
            self.headImageView.hidden = YES;
            if (_localCanvas == nil && activeCall.uploadVideoStreamSelf) {
                [self openLocationCarmeraViewWithFullSScreen:NO]; //小屏
                //本地 显示View 添加手势
                [self addGestureRecognizer:_localCanvas.videoView];
                //为远程View添加手势
                [self addGestureRecognizer:_remoteCanvas.videoView];
                
            } else if (_localCanvas != nil && !activeCall.uploadVideoStreamSelf) {
                [JCManager.shared.mediaDevice stopVideo:_localCanvas];
                [_localCanvas.videoView removeFromSuperview];
                _localCanvas = nil;
            }
            if (_remoteCanvas == nil && activeCall.uploadVideoStreamOther) {
                [self openRemoteCarmeraViewWithRenderId:activeCall.renderId isFull:YES];
                //为远程View添加手势
                [self addGestureRecognizer:_remoteCanvas.videoView];
                //本地 显示View 添加手势
                [self addGestureRecognizer:_localCanvas.videoView];
            } else if (_remoteCanvas != nil && !activeCall.uploadVideoStreamOther) {
                [JCManager.shared.mediaDevice stopVideo:_remoteCanvas];
                [_remoteCanvas.videoView removeFromSuperview];
                _remoteCanvas = nil;
            }
            //视频默认 启用扬声器
            if(!JCManager.shared.mediaDevice.isSpeakerOn){
                [JCManager.shared.mediaDevice enableSpeaker:YES];
            }
            [self.rightBtn setImage:[UIImage imageNamed:@"Button_Camera"] forState:0];
            [self.rightBtn setImage:[UIImage imageNamed:@"Button_Camera_active"] forState:UIControlStateSelected];
            self.rightBtnDesLabel.text = @"转换摄像头";
            
        }else{
            self.nameLabel.hidden = NO;
            self.headImageView.hidden = NO;
            //音频默认 不启用扬声器
            [self.rightBtn setImage:[UIImage imageNamed:@"sound"] forState:0];
            [self.rightBtn setImage:[UIImage imageNamed:@"sound_selected"] forState:UIControlStateSelected];
            self.rightBtnDesLabel.text = @"免提";            
            
        }
        //摄像头转换(视频) 语音(免提)
        self.rightBtnView.hidden = NO;
        
        
        
    } else if(activeCall.state == JCCallStateOk ||
              activeCall.state == JCCallStateCancel ||
              activeCall.state == JCCallStateCanceled){
        xLog(@"状态改变: %ld",(long)activeCall.state);
        [UICommon MessageSuccessText:@"通话已结束" isImg:NO];
        [JCManager.shared.mediaDevice stopAudio];
        [JCManager.shared.mediaDevice stopCamera];
        //通话正常结束
        [self removeCanvas];
    }
}
-(void)openLocationCarmeraViewWithFullSScreen:(BOOL)isFull{
    if(!_localCanvas){
        xLog(@"JCManager.shared.mediaDevice.camera : %@",JCManager.shared.mediaDevice.camera)
        _localCanvas = [JCManager.shared.mediaDevice startCameraVideo:JCMediaDeviceRenderFullScreen];
        if(JCManager.shared.mediaDevice.camera.cameraType != JCMediaDeviceCameraTypeFront){
            [JCManager.shared.mediaDevice switchCamera];
        }
        [self.view insertSubview:_localCanvas.videoView aboveSubview:self.backView];
    }
    if(isFull){
        _localCanvas.videoView.frame = CGRectMake(0,0,ScreenWidth  ,ScreenHeight);
    }else{
        _localCanvas.videoView.frame = CGRectMake(ScreenWidth*(1-0.25)-25, 50, ScreenWidth * 0.25, ScreenHeight*0.25);
    }
}
-(void)openRemoteCarmeraViewWithRenderId:(NSString*)renderId isFull:(BOOL)isFull{
    if(!_remoteCanvas){
        _remoteCanvas = [JCManager.shared.mediaDevice startVideo:renderId renderType:JCMediaDeviceRenderFullContent];
//        [_remoteCanvas rotate:0];
        [self.view insertSubview:_remoteCanvas.videoView aboveSubview:self.backView];
    }
    if(isFull){
        _remoteCanvas.videoView.frame = CGRectMake(0,0,ScreenWidth  ,ScreenHeight);
        //需要把自己的换成小屏的
        _localCanvas.videoView.frame = CGRectMake(ScreenWidth*(1-0.25)-25, 50, ScreenWidth * 0.25, ScreenHeight*0.25);
    }else{
        _remoteCanvas.videoView.frame = CGRectMake(ScreenWidth*(1-0.25)-25, 50, ScreenWidth * 0.25, ScreenHeight*0.25);
        _localCanvas.videoView.frame =  CGRectMake(0,0,ScreenWidth  ,ScreenHeight);
    }
}

-(void)removeCanvas
{
    if (_localCanvas) {
        [JCManager.shared.mediaDevice stopVideo:_localCanvas];
        [_localCanvas.videoView removeFromSuperview];
        _localCanvas = nil;
    }
    if (_remoteCanvas) {
        [JCManager.shared.mediaDevice stopVideo:_remoteCanvas];
        [_remoteCanvas.videoView removeFromSuperview];
        _remoteCanvas = nil;
    }
}
//MARK: 为View 添加拖动和双击手势
-(void)addGestureRecognizer:(UIView*)view{
    //添加拖动手势
    UIPanGestureRecognizer *panGestureRecognizer = [[UIPanGestureRecognizer alloc]
                                                    initWithTarget:self
                                                    action:@selector(handlePan:)];
    [view addGestureRecognizer:panGestureRecognizer];
    //双击手势
    UITapGestureRecognizer *doubleTapGesture = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(handleDoubleTap:)];
    doubleTapGesture.numberOfTapsRequired =2;
    doubleTapGesture.numberOfTouchesRequired =1;
    [view addGestureRecognizer:doubleTapGesture];
}

//MARK: --- 拖动手势 ----
- (void)handlePan:(UIPanGestureRecognizer*)recognizer{
    UIView *selectView = recognizer.view;
    if(selectView.bounds.size.width != ScreenWidth){ //不是全屏状态
        // Figure out where the user is trying to drag the view.
        CGPoint translation = [recognizer translationInView:self.view];
        CGPoint newCenter = CGPointMake(recognizer.view.center.x+ translation.x,
                                        recognizer.view.center.y + translation.y);//    限制屏幕范围：
        newCenter.y = MAX(recognizer.view.frame.size.height/2, newCenter.y);
        newCenter.y = MIN(self.view.frame.size.height - recognizer.view.frame.size.height/2,  newCenter.y);
        newCenter.x = MAX(recognizer.view.frame.size.width/2, newCenter.x);
        newCenter.x = MIN(self.view.frame.size.width - recognizer.view.frame.size.width/2,newCenter.x);
        recognizer.view.center = newCenter;
        [recognizer setTranslation:CGPointZero inView:self.view];
    }
    
}
//MARK: --- 双击放大----
-(void)handleDoubleTap:(UIGestureRecognizer *)recognizer{
    UIView *selectView = recognizer.view;
    CGRect tempRect = selectView.frame;
    
    if(selectView.bounds.size.width != ScreenWidth){
        if([_localCanvas.videoView isEqual:selectView]){
            _localCanvas.videoView.frame = CGRectMake(0, 0, ScreenWidth, ScreenHeight);
            _remoteCanvas.videoView.frame = tempRect;
            [self.view exchangeSubviewAtIndex:_remoteCanvas.videoView.getInSuperViewIndex withSubviewAtIndex:_localCanvas.videoView.getInSuperViewIndex];
        }else{
            _remoteCanvas.videoView.frame = CGRectMake(0, 0, ScreenWidth, ScreenHeight);
            _localCanvas.videoView.frame = tempRect;
            [self.view exchangeSubviewAtIndex:_localCanvas.videoView.getInSuperViewIndex withSubviewAtIndex:_remoteCanvas.videoView.getInSuperViewIndex];
        }
    }
    
}

/**
 MARK: APP 主动挂断按钮
 
 */
- (IBAction)activeHangUpBtnAction:(id)sender {
    [self stopRing];
    [JCManager.shared.call term:[self getActiveCall] reason:JCCallReasonNone description:@"APP挂断"];
    [JCManager.shared _stopCallTimeoutTimer];
    [JCManager.shared _stopVideoLimitTimeoutTimer];
    [JCManager.shared.mediaDevice stopVideo:_localCanvas];
    [JCManager.shared.mediaDevice stopVideo:_remoteCanvas];
    JCManager.shared.callViewController = nil;
    [self dismissViewControllerAnimated:YES completion:nil];
}

/**
 MARK: APP 被动挂断按钮
 
 */
- (IBAction)hangUpButton:(UIButton *)sender {
    [self stopRing];
    [JCManager.shared.call term:[self getActiveCall] reason:JCCallReasonNone description:@"APP挂断"];
    [JCManager.shared _stopCallTimeoutTimer];
    [JCManager.shared _stopVideoLimitTimeoutTimer];
    [JCManager.shared.mediaDevice stopVideo:_localCanvas];
    JCManager.shared.callViewController = nil;
    [self dismissViewControllerAnimated:YES completion:nil];
}

/**
 MARK: APP 接听按钮
 */
- (IBAction)acceptBtnAction:(id)sender {
    
    [self stopRing];
    [[JCManager shared].call answer:[self getActiveCall] video:true];
}

//MARK: 切换摄像头 / 切换免提
- (IBAction)didClickSwitchCameraButton:(UIButton *)sender {
    sender.selected = !sender.selected;
    if ([self.rightBtnDesLabel.text isEqualToString:@"免提"]) {
        // 切换免提
        [JCManager.shared.mediaDevice enableSpeaker:sender.selected];
    }else{
        // 切换摄像头
        [JCManager.shared.mediaDevice switchCamera];
    }
    
}

//MARK: 静音
- (IBAction)didClickMuteButton:(UIButton *)sender {
    sender.selected = !sender.selected;
    //[JCManager.shared.call mute:[self getActiveCall]];
    [JCManager.shared.call muteMicrophone:[self getActiveCall] mute:sender.selected];
}

#pragma mark - 工具函数

-(JCCallItem*)getActiveCall
{
    for (JCCallItem* item in JCManager.shared.call.callItems) {
        if (item.active) {
            return item;
        }
    }
    return nil;
}

- (NSString *)genCallInfo:(JCCallItem*)item {
    switch (item.state) {
        case JCCallStateInit:
            return @"呼叫中";
        case JCCallStatePending:
            return @"振铃中";
        case JCCallStateConnecting:
            return @"连接中";
        case JCCallStateTalking:
            if (item.hold) {
                return @"挂起";
            } else if (item.held) {
                return @"被挂起";
            } else {
                return [self formatTalkingTime:((long)[[NSDate date] timeIntervalSince1970] - item.talkingBeginTime)];
            }
        case JCCallStateOk:
            return @"通话结束";
        case JCCallStateCancel:
            return @"通话结束";
        case JCCallStateCanceled:
            return @"挂断";
        case JCCallStateMissed:
            return @"未接";
        default:
            return @"异常";
    }
}

//- (NSString *)genNetStatus:(JCCallItem *)item {
//    if (item.state != JCCallStateTalking) {
//        return @"";
//    }
//    switch (item.netStatus) {
//        case JCCallNetWorkDisconnected:
//            return @"无网络";
//        case JCCallNetWorkVeryBad:
//            return @"很差";
//        case JCCallNetWorkBad:
//            return @"差";
//        case JCCallNetWorkNormal:
//            return @"一般";
//        case JCCallNetWorkGood:
//            return @"好";
//        case JCCallNetWorkVeryGood:
//            return @"非常好";
//        default:
//            return @"";
//    }
//}


//MARK: 响铃的 MP3
- (void)playRing:(NSString *)name {
    [self stopRing];
    AVAudioSession *audioSession = [AVAudioSession sharedInstance];
    [audioSession setCategory:AVAudioSessionCategoryPlayback error:nil];
    [audioSession setActive:YES error:nil];

    NSURL *path = [[NSBundle mainBundle] URLForResource:name withExtension:@"mp3"];
    audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:path error:nil];
    audioPlayer.numberOfLoops = -1;
    [audioPlayer play];
}

- (void)stopRing {
    if (audioPlayer) {
        [audioPlayer stop];
        audioPlayer = nil;
    }
}

#pragma mark - Timer

- (void)_updateCallDuration
{
    JCCallItem *item = [self getActiveCall];
    if(item){
        self.callDuration = [[NSDate date] timeIntervalSince1970] - item.talkingBeginTime;
        self.timeLabel.text = [self formatTalkingTime:((long)[[NSDate date] timeIntervalSince1970] - item.talkingBeginTime)];
    }
}
- (NSString *)formatTalkingTime:(long)time
{
    return [NSString stringWithFormat:@"%02ld:%02ld", time/60, time%60];
}

- (void)_startCallDurationTimer
{
    [self _stopCallDurationTimer];
    
    self.callDuration = 0;
    self.callDurationTimer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(_updateCallDuration) userInfo:nil repeats:YES];
}

- (void)_stopCallDurationTimer
{
    if (self.callDurationTimer) {
        [self.callDurationTimer invalidate];
        self.callDurationTimer = nil;
    }
}

@end