Object-C之系统电话监听

1.调用系统电话

///调用系统电话
- (void)onClickOpenTelPhone:(NSString*)telPhoneNumber {

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

  [[UIApplication sharedApplication] openURL:telURL];
}

2.监听打电话状态

导入（CoreTelephony/CTCallCenter.h）和（CoreTelephony/CTCall.h）头文件

//1.CTCallCenter *_callCenter;//必须声明属性或者实例变量，要不不会回调block

//2.初始化监听变量
- (void)initCoreTelephoneCTCall {

    _callCenter = [[CTCallCenter alloc]init];
    
    _callCenter.callEventHandler = ^(CTCall* call){
        
        if ([call.callState isEqualToString:CTCallStateDisconnected]) {
            
            NSLog(@"挂断了电话咯Call has been disconnected");
            
        } else if ([call.callState isEqualToString:CTCallStateConnected]) {
            
            NSLog(@"电话通了Call has just been connected");
            
        } else if([call.callState isEqualToString:CTCallStateIncoming]) {
            
            NSLog(@"来电话了Call is incoming");
            
        } else if ([call.callState isEqualToString:CTCallStateDialing]) {
            
            NSLog(@"正在播出电话call is dialing");
            
        } else {
            
            NSLog(@"嘛都没做Nothing is done");
            
        }
    };
}