objective c - beginSheetModalForWindow - the alert window disappear -

what's wrong piece of code implemented in appdelegate ? alert appears shortly on window , disappears. alertdidend callback method never called.

i've tried clean product in xcode 4.6.1 , rebuild it, without success.

- (void) alertdidend:(nsalert *)alert returncode:(nsinteger)returncode contextinfo:(void *)contextinfo {     [[alert window] orderout:self];     alertresult = returncode;     nslog(@"alertdidend called"); }  - (void) showalert {     nsalert *savealert = [[nsalert alloc] init];      [savealert setalertstyle:nswarningalertstyle];     [savealert setmessagetext:messagetext];     [savealert setinformativetext:informativetext];     [savealert addbuttonwithtitle:defaultbuttontitle];     [savealert addbuttonwithtitle:secondbuttontitle];      [savealert beginsheetmodalforwindow:[self window]                         modaldelegate:self                         didendselector:@selector(alertdidend:returncode:contextinfo:)                         contextinfo:nil]; } 

i answer myself. problem elsewhere in applicationshouldterminate method.

- (nsapplicationterminatereply )applicationshouldterminate:(nsapplication *) sender {   if(conditionok)         dosomestuff;     else    // changes not saved     {   [self showalert];         handlebuttonclicked;     }      return nsterminatenow; } 

in else branch of if statement showalert executed "return nsterminatenow" also. application doesn't wait until button clicked in alert. returns immediately. test response have not yet been posted.

i modify applicationshouldterminate method.

- (nsapplicationterminatereply )applicationshouldterminate:(nsapplication *) sender {   if(conditionok)         dosomestuff;         return nsterminatenow;     else     {   [self showalert];         return nsterminatecancel;     } } 

the alertdidend callback method test returned button, job , send terminate signal if necessary.

at moment, have not fixed problem know problem.

just question : beginsheetmodalforwindow asynchronous or asynchronous in context of applicationshouldterminate ?

this final version of applicationshouldterminate

- (nsapplicationterminatereply )applicationshouldterminate:(nsapplication *) sender {     if([_buttonsave isenabled])     {   if(quitmenuterminate)             [self majfile];         else         {   [self showalert];             return nsterminatelater;         }     }      return nsterminatenow; } 

in callback method, alertdidend, of beginsheetmodalforwindow, call

[[nsapplication sharedapplication] replytoapplicationshouldterminate:yes]; 

and ok now.