title: How can I create a window with transparent background with swift on osx?
body: <p>I want to create an osx/cocoa application on my mac, which does something very simple: Display a text string on my mac, with no background. Ultimately this will be a timer which displays as an overlay on top of other windows, without being too intrusive.</p>
  
  <p>I tried setting <code>window.backgroundColor = NSColor(red: 1.0, green:0.5, blue:0.5, alpha: 0.5)</code> (see the alpha is 0.5), in <code>applicationDidFinishLaunching</code> but this doesn't turn it into something remotely transparent.</p>
  
  <p>Any good soul wants to suggest a way to do this?</p>