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Re: Using beginSheet

> When I get this message it is usually because I have misplaced my
> window - not hooked up properly in IB or released or something. Make
> sure that both your windows are available! And if you are still learning
> how to deal with windows and sheets, it is usually easier to create them
> in IB, then programmatically like you do in your example here:

That's exactly what happened, in my case it was because the window wasn't
loaded by "initWithWindowNibName", still trying to figure out why.

> > NSWindowController *newWindow = [[NSWindowController alloc]
> > initWithWindowNibName: @"AddGroupDialog"];
> >
> > NSModalSession session = [NSApp
> > beginModalSessionForWindow:[newWindow window]];
> > [NSApp runModalSession:session];
> > [NSApp beginSheet:[newWindow window]
> > modalForWindow:mainWindow
> > modalDelegate: self
> > didEndSelector: @selector(didEndAddGroupSheet)
> > contextInfo: NULL];
> >
> > [NSApp endModalSession:session];
>
> When I see this code I'm a bit curious why you manually add a modal
> session? Aren't sheets automatically modal? Try only this:

That originally didn't add a modal session first. I added it later because
of a misleading error, "need modal window to create modal session", this
error was actually because one of the windows wasn't loaded by
"initWithWindowNibName".

>
> NSWindowController *newWindow = [[NSWindowController alloc]
> initWithWindowNibName: @"AddGroupDialog"];
> [NSApp beginSheet:[newWindow window]
> modalForWindow:mainWindow
> modalDelegate: self
> didEndSelector: @selector(didEndAddGroupSheet)
> contextInfo: NULL];
>
> Also notice the sheet doesn't block the execution of your code, so you
> cannot end it right after opening it in the code - or else it will
> disappear as soon as you have opened it... You will have to end the
> modal session / sheet in the action method the buttons in your sheet, or
> in the didEndSelector specified method.
>
> I've also read that the didEndSelector must match this type of selector
> "didEndSheet:returnCode:contextInfo:" - ie. that number of parameters
> and types, but I'm not sure that it is mandatory - keep it in mind if
> you run into problems with that later though.

Yes in the end I got it to work by doing exactly what you suggested
creating a window in Interface Builder letting the app load the window for
me and I also had to use the didEndSheet selector.

Thanks for the help
~Hua Ying

References: 
 >Re: Using beginSheet (From: j o a r <email@hidden>)



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