In some cases [[ UIApplication sharedApplication] keyWindow ] returns nil.
On some devices it's happening pretty often but in general it's sporadic
Anyone know the reasons it would return nil?
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See this answer: http://stackoverflow.com/a/15623745/308315 – iwasrobbed Mar 25 '13 at 20:07
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...When happens a transition form one window to another, i suppose. Users can't see any transitions, but they happen.
In iPhone OS 2.0 to iPhone 3.1.3, one example is immediately after you sent the message play to a MPMoviePlayerController instance:
[[[MPMoviePlayerController alloc]initWithContentURL:[@"http://someurl"]]play];
There might be also other situations.
mxg
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1+1 I'm pretty sure all the system provided modal views do this. The image picker view for example. You will get it before the window loads in the app delegate as well. – TechZen Jun 11 '10 at 12:48