1.調(diào)用系統(tǒng)電話

///調(diào)用系統(tǒng)電話
- (void)onClickOpenTelPhone:(NSString*)telPhoneNumber {

  NSURL *telURL =[NSURL URLWithString:[NSString stringWithFormat:@"tel://%@", telPhoneNumber]];

  [[UIApplication sharedApplication] openURL:telURL];
}

2.監(jiān)聽打電話狀態(tài)

導(dǎo)入（CoreTelephony/CTCallCenter.h）和（CoreTelephony/CTCall.h）頭文件

//1.CTCallCenter *_callCenter;//必須聲明屬性或者實(shí)例變量，要不不會回調(diào)block

//2.初始化監(jiān)聽變量
- (void)initCoreTelephoneCTCall {

    _callCenter = [[CTCallCenter alloc]init];
    
    _callCenter.callEventHandler = ^(CTCall* call){
        
        if ([call.callState isEqualToString:CTCallStateDisconnected]) {
            
            NSLog(@"掛斷了電話咯Call has been disconnected");
            
        } else if ([call.callState isEqualToString:CTCallStateConnected]) {
            
            NSLog(@"電話通了Call has just been connected");
            
        } else if([call.callState isEqualToString:CTCallStateIncoming]) {
            
            NSLog(@"來電話了Call is incoming");
            
        } else if ([call.callState isEqualToString:CTCallStateDialing]) {
            
            NSLog(@"正在播出電話call is dialing");
            
        } else {
            
            NSLog(@"嘛都沒做Nothing is done");
            
        }
    };
}