UIStackView : Is it really necessary to call both removeFromSuperView and removeArrangedSubview to remove a subview?

Question

From the UIStackView Class Reference

In removeArrangedSubview:

To prevent the view from appearing on screen after calling the stack’s removeArrang

Answer 1

I will suggest get arranged subviews then remove it like below code .

for view in self.stackView.arrangedSubviews{
      self.stackView.removeArrangedSubview(view)
      view.removeFromSuperview()
}

Answer 2

Hacking With Swift provides a pretty good example and explanation, using Web views in this case.

The reason is that you can remove something from a stack view's arranged subview list then re-add it later, without having to recreate it each time – it was hidden, not destroyed. We don't want a memory leak, so we want to remove deleted web views entirely. If you find your memory usage ballooning, you probably forgot this step!

https://www.hackingwithswift.com/read/31/4/removing-views-from-a-uistackview-with-removearrangedsubview

Answer 3

No, To remove specific view.

func removeArrangedSubview(_ view: UIView)

To remove all subviews

stackView.arrangedSubviews.forEach { $0.removeFromSuperview() }

Answer 4

To remove a arrangedSubview from a stackview is

// To remove it from the view hierarchy
   subView.removeFromSuperview()

Answer 5

For removing i use this extension. Don't really know is it necessary to remove constraints. But maybe it would help.

extension UIStackView {
    func removeAllArrangedSubviews() {
        let removedSubviews = arrangedSubviews.reduce([]) { (allSubviews, subview) -> [UIView] in
            self.removeArrangedSubview(subview)
            return allSubviews + [subview]
        }

        for v in removedSubviews {
            if v.superview != nil {
                NSLayoutConstraint.deactivate(v.constraints)
                v.removeFromSuperview()
            }
        }
    }
}

Answer 6

No, just call subview.removeFromSuperview()

/* Removes a subview from the list of arranged subviews without removing it as
 a subview of the receiver.
    To remove the view as a subview, send it -removeFromSuperview as usual;
 the relevant UIStackView will remove it from its arrangedSubviews list
 automatically.
 */
open func removeArrangedSubview(_ view: UIView)