Unable to Show onComingCall ViewController for my iOS VoIP Application - ios

Question

I want my App to show IncomingCall ViewController, when App Receives Some Incoming Call.
This is my Code that I uses to show Incoming Call.. From my ContactsViewController, which is Active View when Incoming Call take places.
- (void)showIncomigCallVC{
[self performSegueWithIdentifier:#"segueToIncomingCallVC" sender:nil];
}
This is my Code, that is called by Library.
/* Callback called by the library upon receiving incoming call */
static void on_incoming_call(pjsua_acc_id acc_id, pjsua_call_id call_id,
pjsip_rx_data *rdata)
{
pjsua_call_info ci;
PJ_UNUSED_ARG(acc_id);
PJ_UNUSED_ARG(rdata);
pjsua_call_get_info(call_id, &ci);
PJ_LOG(3,(THIS_FILE, "....\n\n\n Incoming call from %.*s!! \n\n\n",
(int)ci.remote_info.slen,
ci.remote_info.ptr));
ContactsViewController *incomingCallVC = [[ContactsViewController alloc]init];
[incomingCallVC showIncomigCallVC];
/* Automatically answer incoming calls with 200/OK */
pjsua_call_answer(call_id, 200, NULL, NULL);
}
And This is my Console Output:
20:39:37.482 XCPjsua.c ......
Incoming call from <sip:eeshaMiss12#ekiga.net>!!
2017-01-16 20:39:37.494 simpleVoIP[922:19652] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Receiver (<ContactsViewController: 0x7bea3d00>) has no segue with identifier 'segueToIncomingCallVC''
*** First throw call stack:
(
0 CoreFoundation 0x03a14212 __exceptionPreprocess + 194
1 libobjc.A.dylib 0x034d3e66 objc_exception_throw + 52
2 UIKit 0x01a69893 -[UIViewController shouldPerformSegueWithIdentifier:sender:] + 0
3 simpleVoIP 0x00089ba6 -[ContactsViewController showIncomigCallVC] + 70
4 simpleVoIP 0x00086caf on_incoming_call + 255
5 simpleVoIP 0x000fc273 pjsua_call_on_incoming + 3811
6 simpleVoIP 0x00103294 mod_pjsua_on_rx_request + 84
7 simpleVoIP 0x0012938f pjsip_endpt_process_rx_data + 351
8 simpleVoIP 0x00128bf2 endpt_on_rx_msg + 546
9 simpleVoIP 0x0012fba1 pjsip_tpmgr_receive_packet + 849
10 simpleVoIP 0x001315ec udp_on_read_complete + 316
11 simpleVoIP 0x0014b8e0 ioqueue_dispatch_read_event + 704
12 simpleVoIP 0x0014d5b2 pj_ioqueue_poll + 946
13 simpleVoIP 0x001290c3 pjsip_endpt_handle_events2 + 163
14 simpleVoIP 0x00102023 worker_thread + 99
15 simpleVoIP 0x0014eb96 thread_main + 86
16 libsystem_pthread.dylib 0x04c8a11b _pthread_body + 184
17 libsystem_pthread.dylib 0x04c8a063 _pthread_body + 0
18 libsystem_pthread.dylib 0x04c8993e thread_start + 34
)
libc++abi.dylib: terminating with uncaught exception of type NSException
I am Beginner, any Recommendation will be appreciated.. Thanks in Advance

Answer 1

You are experiencing the crash, because you are programatically allocating your ContactsViewController, instead of using from the storyboard.
When you do this:
ContactsViewController *incomingCallVC = [[ContactsViewController alloc]init];
[incomingCallVC showIncomigCallVC];
You are creating an instance of ContactsViewController, what has nothing to do with the one created in our storyboard.
It would be possible to overcome on this, however, you are trying to make a segue call on a viewController, what has only been loaded to the memory, but is not visible at all. That will never work, it will always crash.
I would recommend to show your viewController, whatever is behind the segue, straight away, instead of creating a viewController and show it with a segue.
EDIT:
Using the code below, you should be able to present your desired UIViewController subclass from the end of your callback function.
// Lets get keywindow
UIWindow* keyWindow = [[[UIApplication sharedApplication] delegate] window];
keyWindow.frame = [UIScreen mainScreen].bounds;
// Lets get `IncomingCallViewController` from storyboard
UIStoryboard *sb = [UIStoryboard storyboardWithName:#"TheNameOfYourStoryboard" bundle:nil];
// do not forget to set the identifier of your viewController on the storyboard as "IncomingCallViewController"
UIViewController *vc = [sb instantiateViewControllerWithIdentifier:#"IncomingCallViewController"];
// Lets present the keyWindow from the main thread
dispatch_async(dispatch_get_main_queue(), ^{
keyWindow.rootViewController = vc;
[keyWindow makeKeyAndVisible];
});