Crash when sending window message to UIApplicationDelegate

[MrMage]

Line 857 of iRate.m currently contains this code:

UIViewController *topController = [UIApplication sharedApplication].delegate.window.rootViewController;

However, the window property of the UIApplicationDelegate is declared as optional. Thus, the above code leads to a crash when my application delegate does not implement the window method.

I suggest checking for existence of that method via -respondsToSelector: first and using [UIApplication sharedApplication].keyWindow otherwise.