监听全局事件 

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[NSEvent addGlobalMonitorForEventsMatchingMask:NSKeyUpMask 
	handler:^(NSEvent * _Nonnull event) {
        [self handleEvent:event];
    }];
    
-(BOOL) handleEvent:(NSEvent *) event{
const NSUInteger kNotAlt = NSAlternateKeyMask | NSShiftKeyMask | NSCommandKeyMask;
	if ((event.modifierFlags & NSControlKeyMask) != 0
	   &&
	   ((event.modifierFlags & kNotAlt) == 0)
	   &&
	   [event.charactersIgnoringModifiers isEqualToString:@"x"]) {
		.....
		
		// 激活app
	   [NSApp activateIgnoringOtherApps:YES];
	   return YES;
	}
	return NO;
}