How to draw focus ring around NSBox on focus of child NSTextView in objective-c

I have one NSTextView within NSBox. I want to draw focus ring aroung NSBox whenever NSTextView got focus a开发者_StackOverflownd remove focus ring as soon as NSTextView lost focus.

Thanks,

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To do this, create a subclass of NSTextView, and override the -becomeFirstResponder like so:

- (BOOL)becomeFirstResponder
{
    BOOL returnValue = [super becomeFirstResponder];
    if (returnValue) {
        //do something here when this becomes first responder
    }

    return returnValue;
}

You can set up an NSNotification in the if statement above so that when that code block gets run, your view containing the NSBox can get called and subsequently draw a focus ring on the NSBox. To handle the NSTextView losing focus, you'll want to override -resignFirstResponder, like so:

- (BOOL)resignFirstResponder
{
    BOOL returnValue = [super resignFirstResponder];
    if(returnValue){
        //do something when resigns first responder

    }
    return returnValue;
}

Be sure to change the class in interface builder, and change your class type in your header and/or implementation files to your new subclass of NSTextView: