NSWindow.contentLayoutGuide type Any?

Question

Created Dec ’16

Replies 4

Boosts 0

Views 1.2k

Participants 3

In the 2016 WWDC session "Crafting Modern Cocoa Apps", there is a description of how to set the offset of a window's content when using the "Full Size Content View" setting:

override func updateViewConstraints() {
  if topConstraint == nil {
    if let topAnchor = titleTextField.window?.contentLayoutGuide?.topAnchor {
      topConstraint = titleTextField.topAnchor.constraint(equalTo: topAnchor, constant: 2)
      topConstraint!.isActive = true
    }
  }
  super.updateViewConstraints()
}

However, in Xcode 8.1 [editted], this does not compile, because NSWindow's contentLayoutGuide property is declared as

    open var contentLayoutGuide: Any? { get }

Has anyone successfully used this property? If so, how? Did you have to cast the Any? type to something concrete, and if so, what?

Boost

Answer 1

karim OP

Dec ’16

Am I really the first one to try this under Xcode 8.1 [edited]?

0

Answer 2

karim OP

Dec ’16

Argh... I just realized I typed Xcode 7.1... That's wrong—Sorry, just habbit. No wonder nobody replied, LOL

This is happening in 8.1, and now 8.2.

0

Answer 3

kaunteya OP

Oct ’20

contentLayoutGuide is internally of type NSLayoutGuide.

So all you have to do is cast it to NSLayoutGuide

Code Block if let guide = titleTextField.window?.contentLayoutGuide as? NSLayoutGuide {
   let topAnchor = guide.topAnchor
}

0

Answer 4

Kentzo OP

Oct ’20

@kaunteya that is not correct. Internally it may be either a NSLayoutGuide or an NSView. The Any? "hack" is necessary since there is no protocol to express *anchor properties. But in practice it will be an NSLayoutGuide most of the time unless you customize window's content view or play with its view hierarchy.

0