Hide buttons from titlebar in Cocoa

I believe this should work:

[[window standardWindowButton:NSWindowCloseButton] setHidden:YES];
[[window standardWindowButton:NSWindowMiniaturizeButton] setHidden:YES];
[[window standardWindowButton:NSWindowZoomButton] setHidden:YES];

another way is...

for (id subview in [self window].contentView.superview.subviews) {
    if ([subview isKindOfClass:NSClassFromString(@"NSTitlebarContainerView")]) {
        NSView *titlebarView = [subview subviews][0];
        for (id button in titlebarView.subviews) {
            if ([button isKindOfClass:[NSButton class]]) {
                [button setHidden:YES];
            }
        }
    }
}

Swift code for accepted answer

window!.standardWindowButton(.miniaturizeButton)!.isHidden = true
window!.standardWindowButton(.zoomButton)!.isHidden = true
window!.standardWindowButton(.closeButton)!.isHidden = true

I also needed this but visible for mouse overs - Swift:

var trackingTag: NSTrackingRectTag?
override func mouseEntered(with theEvent: NSEvent) {
    if trackingTag == theEvent.trackingNumber {
        window!.standardWindowButton(.closeButton)!.alphaValue = 1.00
    }
}
override func mouseExited(with theEvent: NSEvent) {
    if trackingTag == theEvent.trackingNumber {
        window!.standardWindowButton(.closeButton)!.alphaValue = 0.01
    }
}
func updateTrackingAreas(_ establish : Bool) {
    if let tag = trackingTag {
        window!.standardWindowButton(.closeButton)!.removeTrackingRect(tag)
    }
    if establish, let closeButton = window!.standardWindowButton(.closeButton) {
        trackingTag = closeButton.addTrackingRect(closeButton.bounds, owner: self, userData: nil, assumeInside: false)
    }
}
override func windowDidLoad() {
    window!.ignoresMouseEvents = false
    updateTrackingAreas(true)
    window!.standardWindowButton(.closeButton)!.alphaValue = 0.01
}
func windowShouldClose(_ sender: Any) -> Bool {
    window!.ignoresMouseEvents = true
    updateTrackingAreas(false)
    return true
}

Visibility is needed but just slightly - 0.01 opacity, to have the tracking area effective.