Receive UIKeyCommands without a text view or text field as the first responder.

TMDashboardViewController.m

@implementation TMDashboardViewController

#pragma mark - UIResponder

- (BOOL)canBecomeFirstResponder {
    return YES;
}

- (NSArray *)keyCommands {
    static NSArray *keyCommands;
    
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        UIKeyCommand *composeCommand = [UIKeyCommand keyCommandWithInput:@"c" modifierFlags:UIKeyModifierAlternate action:@selector(composeShortcut:)];
        
        keyCommands = @[composeCommand];
    });
    
    return keyCommands;
}

#pragma mark - TMDashboardViewController

- (void)composeShortcut:(UIKeyCommand *)command {
    [self compose];
}

@end