The incredible invisible window

OSX 10.12, Xcode 8.0

I’m not entirely certain under which circumstances this is useful, but

override func windowDidLoad() {
super.windowDidLoad()

self.window?.isOpaque = false
self.window?.backgroundColor = NSColor.clear

}

}[/code]

is a thing of beauty.

If the view in the window’s contentViewController overrides override func draw(_ dirtyRect: NSRect), the effect is lost; if it merely contains elements like buttons and text fields, they will retain their opacity while the rest of the window vanishes.



This creates some interesting effects:

override func draw(_ dirtyRect: NSRect) {
super.draw(dirtyRect)
NSColor.cyan.set()
NSBezierPath.fill(self.bounds)
alphaValue = 0.5
}
}[/code]

 
(I have absolutely no idea why I would want to use this, but it needed to be recorded, and I shall remember window?.backgroundColor in the future.)