Webpages loaded in WKWebView does not respond to keypress events - objective-c

Question

I want to enable keyboard shortcuts like Cmd+c , Cmd+v to work on webpages loaded inside WKWebView, but cannot find a solution.
Webview on the other hand has methods like Copy/Paste/Cut which could be leveraged by overriding (void)keyDown:(NSEvent *)event method. But WKWebView does not seem to have any similar funtion.
In WebView i could do something like
- (void)keyDown:(NSEvent *)event {
NSString *s = [event charactersIgnoringModifiers];
if (s == nil)
return;
if (([event modifierFlags] & NSDeviceIndependentModifierFlagsMask) == NSCommandKeyMask)
{
if ([s caseInsensitiveCompare:#"a"] == NSOrderedSame)
{
if ([[self firstResponder] respondsToSelector:#selector(selectAll:)])
[self.contentView selectAll:self];
}
else if ([s caseInsensitiveCompare:#"c"] == NSOrderedSame)
{
if ([[self firstResponder] respondsToSelector:#selector(copy:)])
[self.contentView copy:self];
}
else if ([s caseInsensitiveCompare:#"v"] == NSOrderedSame)
{
if ([[self firstResponder] respondsToSelector:#selector(paste:)])
[self.contentView paste:self];
}
else if ([s caseInsensitiveCompare:#"x"] == NSOrderedSame)
{
if ([[self firstResponder] respondsToSelector:#selector(cut:)])
[self.contentView cut:self];
}
else if ([s caseInsensitiveCompare:#"z"] == NSOrderedSame)
{
[self.contentView undo];
}
}
else
{
[super keyDown:event];
} }
In the above code self.contentView points to a WebView object