This warning also occurs when I build and run a brand new empty project in Xcode 9.1. Replacing the default NSWindow with an empty custom class of NSWindow with no changes does remove the error, but that behaviour makes no sense. Therefore, I’m filing it as a bug.
Update I realised old approach was not able to create precise round corner. So I updated example to make precise round corner. window1.backgroundColor = NSColor.whiteColor() window1.opaque = false window1.styleMask = NSResizableWindowMask | NSTitledWindowMask | NSFullSizeContentViewWindowMask window1.movableByWindowBackground = true window1.titlebarAppearsTransparent = true window1.titleVisibility = .Hidden window1.showsToolbarButton = false window1.standardWindowButton(NSWindowButton.FullScreenButton)?.hidden = true window1.standardWindowButton(NSWindowButton.MiniaturizeButton)?.hidden = true window1.standardWindowButton(NSWindowButton.CloseButton)?.hidden = … Read more
To change the window level you can’t do it inside viewDidload because view’s window property will always be nil there but it can be done overriding viewDidAppear method or any other method that runs after view is installed in a window (do not use it inside viewDidLoad): Swift 4 or later override func viewDidAppear() { … Read more
http://hints.macworld.com/index.php?topic=system107&page=5 This appears to have been a bug in OS X 10.7.* (Lion) series. With zero changes to my code, the crash no-longer occurs on OS X 10.8 (Mountain Lion) complied with Xcode 4.4.1.
I looked at http://cocoadev.com/wiki/DontExposeMe searching for workaround nothing really worked except. self.window.level = kCGDesktopWindowLevel; now maybe DETECT changes to expose and set that then 🙂 … see How can one detect Mission Control or Command-Tab switcher superseding one’s program in OS X? for that 🙂 maybe an answer will come up there
The problem is that you don’t want to call display, you want to call either makeKeyAndOrderFront or orderFront depending on whether or not you want the window to become the key window. You should also probably use NSBackingStoreBuffered. This code will create your borderless, blue window at the bottom left of the screen: NSRect frame … Read more