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NSAlert Sheet Not Having Focus

EDITED TO ADD: Several months later, I ran into this same bug again!

I had an issue where if I used
beginSheetModalForWindow:modalDelegate:didEndSelector:contextInfo:
to put up an NSAlert as a sheet inside a window, and I was not running on the main thread, the sheet would not have focus. I’m not sure exactly why, but this solution worked for me: Put the call to beginSheetModalForWindow:modalDelegate:didEndSelector:contextInfo: inside another method, showMyAlert, then use performSelectorOnMainThread:withObject:waitUntilDone: to make sure showMyAlert is called on the main thread.

Strangely, if i used runModal to display the NSAlert as a separate modal window, it would have focus.

The whole incident feels funny to me. I suspect there may be some deeper issue at work that I am not aware of. When I have time to investigate further I shall update this post. Unfortunately I don’t have time to look into ’solved’ bugs today.

Explore posts in the same categories: Cocoa, Debugging, MacOSX, NSAlert, Programming

This entry was posted on October 11, 2007 at 3:02 am and is filed under Cocoa, Debugging, MacOSX, NSAlert, Programming. You can subscribe via RSS 2.0 feed to this post's comments. You can comment below, or link to this permanent URL from your own site.

One Comment on “NSAlert Sheet Not Having Focus”

  1. Vincent Gable » Blog Archive » NSAlert + Sheets + Threads = Inexplicable Bugs Says:

    May 14, 2008 at 9:09 pm

    [...] I remembered having encountered weirdness with NSAlert sheets before. The symptoms were different (previously the alert didn’t have focus), but the same solution [...]

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