Re: Alert Sheets hard wired in Interface Builder

FROM : Jens Alfke
DATE : Sun Jun 01 21:07:20 2008

On 1 Jun '08, at 11:19 AM, John Love wrote:

> the NSAlert is
> type-cast as a NSWindow when passed to my dlgEndSelector, so that
> "unrecognized selector" is mystifying.


That's your problem, then: NSAlert isn't an NSWindow; it's a direct 
subclass of NSObject. Your -endCalculateSheet: method's first 
parameter should be (NSAlert*), not (NSWindow*). NSAlert.h says:

// ... The didEndSelector should have the following signature:
//- (void)alertDidEnd:(NSAlert *)alert returnCode:
(NSInteger)returnCode contextInfo:(void *)contextInfo;

This is a bit inconsistent of them since other "didEnd" methods take 
the sheet's NSPanel* as their first argument. I think they did it 
because there's no obvious way to take an NSPanel* and find the 
NSAlert that owns it.

—Jens