Create plain box window like this in Swift?

Question

Below is a screenshot of the \'Squish\' app on the App Store. How am I able to make a window like that, with rounded corners and no separator between the titlebar and content?

Answer 1

Create a new NSWindow in Xcode, then create an outlet for it, and set the titlebarAppearsTransparent property to true:

@IBOutlet weak var windowBlank: NSWindow!

func applicationDidFinishLaunching(aNotification: NSNotification) {
    windowBlank.titlebarAppearsTransparent = true
    windowBlank.backgroundColor = NSColor.whiteColor()
} 

You also have to enable the Full size content view checkbox in the Attributes inspector.