objective c - Present UIAlertController from NSOperation -

objective c - Present UIAlertController from NSOperation -

what tried is:

- (void)main { nserror *err = (__bridge nserror *)error; uialertcontroller * alert = [uialertcontroller alertcontrollerwithtitle:nslocalizedstring(@"error", nil) message:err.localizeddescription preferredstyle:uialertcontrollerstylealert]; uialertaction* ok = [uialertaction actionwithtitle:@"ok" style:uialertactionstyledefault handler:^(uialertaction * action) { //do thing here [self.window.rootviewcontroller dismissviewcontrolleranimated:yes completion:nil]; }]; ... }

the problem there no access self.window in nsoperation subclass. there other way nowadays alert controller?

uiapplicationdelegate instance keeps window object, can , utilize purposes.

[[uiapplication sharedapplication].delegate window]

also [uiapplication sharedapplication] provides other methods may useful you:

- windows - array of windows; – keywindow - gives window receiving keyboard input (or nil);

if not creating additional windows, using [[uiapplication sharedapplication].delegate window] fine.

objective-c ios8 nsoperation uialertcontroller