Firebase Invites always return nil when creates the dialog on QT iOS app -


in qt app ios, how can show firebase invites dialog? when dialog created documentation sample, [firinvites invitedialog], returns nil , open method doesn't work.

this c++ qt interface used in program hide objectivec code:

invitesimpl.h. 

#ifndef invitesimpl_h #define invitesimpl_h #include <qobject> namespace app {  class invitesimpl: public qobject {     q_object public:     explicit invitesimpl(qobject *parent);     ~invitesimpl();     void show(qstring title, qstring msg, qstring actiontext);   signals:         void cancelorerror();     void success(int numinvitations); private:     void *_d; };  } #endif // invitesimpl_h

invitesimpl.mm

#include "invitesimpl.h" #include "invitesobjc.h" #import <foundation/foundation.h>  namespace app {  invitesimpl::invitesimpl(qobject *parent): qobject(parent) { }  invitesimpl::~invitesimpl() {     [(invitesobjc*)_d release]; }  void invitesimpl::show(qstring title, qstring msg, qstring actiontext) {     _d = [[invitesobjc alloc] init];     invitesobjc *invites = (invitesobjc*) _d;     [invites setinvitesimpl: this];     nsstring *nsmsg = @(msg.tostdstring().c_str());     nsstring *nstitle = @(title.tostdstring().c_str());     nsstring *nsactiontext = @(actiontext.tostdstring().c_str());     [invites show:nstitle msg:nsmsg actiontext:nsactiontext]; }  void invitesimpl::cancelorerror() {     emit oncancelorerror(); }  void invitesimpl::success(int numinvitations) {     emit onsuccess(numinvitations); }  }

the objectivec code uses firebase invites:

invitesobjc.h.

#ifndef invitesobjc_h #define invitesobjc_h  #import <uikit/uikit.h>  @interface invitesobjc : uiviewcontroller  @end  #endif // invitesobjc_h

invitesobjc.mm

#import "invitesobjc.h" #import <firebaseinvites/firebaseinvites.h>  @interface invitesobjc ()<firinvitedelegate> @property(strong, nonatomic) id<firinvitebuilder> invitedialog; @property app::invitesimpl *invitesimpl; -(void) show:(nsstring *)title msg:(nsstring *)msg actiontext:(nsstring *)actiontext; @end  @implementation invitesobjc -(void) show:(nsstring *)title msg:(nsstring *)msg actiontext:(nsstring *)actiontext {     _invitedialog = [firinvites invitedialog];     [_invitedialog setmessage:msg];     [_invitedialog setinvitedelegate: self];     [_invitedialog settitle: title];     [_invitedialog setcalltoactiontext:actiontext];     [_invitedialog open]; }  - (void)invitefinishedwithinvitations:(nonnull nsarray *)invitationids                                 error:(nullable nserror *)error {         if (error) {             _invitesimpl->cancelorerror();         }         else {             _invitesimpl->success(invitationids.count);         }     } @end


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