UIKeyCommand with modifier won't be recognized on first invocation

ios, keyboard-shortcuts, objective-c, uikeycommand

Solution

This is a known bug. As a workaround, you can register to respond to just the Command key by passing in an empty string and a selector that does nothing:

[UIKeyCommand keyCommandWithInput:@""
                    modifierFlags:UIKeyModifierCommand 
                           action:@selector(doNothing:)]

Then, by the time the user hits ⌘+e, it'll be the second invocation and it'll register fine.

More information on the bug can found here on OpenRadar. It was submitted on January 27, 2015, and marked as a duplicate on February 24.

Problem

I support keyboard shortcuts in my iOS app through serving `UIKeyCommand` instances from my view controller. The following works like a charm and causes the provided selector to be invoked every time you press e: ``` - (BOOL)canBecomeFirstResponder { return YES; } - (NSArray *)keyCommands { return @[ [UIKeyCommand keyCommandWithInput:@"e" modifierFlags:0 action:@selector(foo:)]]; ]; } ``` However, I want the key command to be ⌘+e, or ``` [UIKeyCommand keyCommandWithInput:@"e" modifierFlags:UIKeyModifierCommand action:@selector(foo:)] ``` This still works, kind of. It won't work the first time you press ⌘+e, but it will work like a charm after that. Why does that happen and how can I fix it?

Original source