Can't set position of modal window

Question

I have a window I want to display as a modal window (OS X 10.10). I'm loading the NIB for the window and am able to set the title successfully and then display the window. But whatever I do to try to affect the window position doesn't work.

This works (part of NSWindowController sub-class):

[[self window] setTitle:title];
[[NSApplication sharedApplication] runModalForWindow:[self window]];

Here are ways with which I've tried to affect the position after setting the title:

[[self window] setFrameOrigin: NSMakePoint(200.0, 200.0) ];
[[self window] setFrameTopLeftPoint: NSMakePoint(200.0, 200.0) ];
[[self window] setFrame: NSMakeRect(200, 300, [[self window] frame].size.width, [[self window] frame].size.height) display:YES];

(I've tried other values as well - just for testing, but nothing.)

I can even query the

[[self window] frame]

and it pretends to accept the new values, but the window stubbornly keeps showing up in the same position.

What gives?

Answer 1

I have solved this by

1- Make a new NSWindow subclass, overriding the center method, where you just make the frame of the new window positioned at whatever NSPoint you want:

class CenteredInParentWindow: NSWindow {

    var parentMinX : CGFloat?
    var parentMinY : CGFloat?

    override func center() {
        guard let parentMinX = parentMinX, let parentMinY = parentMinY else {
            super.center()
            return
        }
        self.setFrameOrigin(NSPoint(x: parentMinX, y: parentMinY))
    }
}

2 - Set WindowController's window class to be the new NSWindow subclass, in Storyboard.

3- Instatiate the window controller and set the attributes of the subclassed window

 let myWindowController = self.storyboard!.instantiateController(withIdentifier: "windowID") as! PlansWindowController
        if let customWindow = myWindowController.window as? CenteredInParentWindow {
            customWindow.parentMinX = NSApplication.shared.mainWindow?.frame.minX
            customWindow.parentMinY = NSApplication.shared.mainWindow?.frame.minY
        }
        NSApp.runModal(for: myWindowController.window!)
}

You may need runModal method for making the window a modal one. Don't forget to include NSApp.stopModal() in the windowWillClose method which is available in NSWindowDelegate in your View controller