Scala: Using reflection to add behavior to setter methods of a variable within a class

I am trying to add behavior to the setters of a variable within a class. To keep things simple let's say that I want to print something to the console whenever a variable is set. Moreover, I want to achieve this using reflection from within a trait that is mixed in the class.

Consider the following code:

class Foo(var bar: String) extends Logger {}

trait Logger { self =>
  // create mirrors to reflect on the delegate
  private val runtimeMr  = runtimeMirror(self.getClass.getClassLoader)
  private val instanceMr = runtimeMr.reflect(self)

}

How can I now:

1) get the setter method(s) from the instanceMr and, more importantly

2) add behavior to the execution of the setter (in my case printing bar before setting it)