Which one is best in “self.view.window?.addSubview()” or “UIApplication.shared.keyWindow?.addSubview()” in iOS

Question

I need to display loaderView in top of the viewcontroller

let loaderView: UIView()
self.view.window?.addSubview(loaderView)

Other type:

let loaderView: UIView()
UIApplication.shared.keyWindow?.addSubview(loaderView)

Both line working fine, but Which code is best for adding subview... Thanks in advance....

Answer 1

Well if you are adding some view (not loader view) in your view controller on Appdelegate window then it's better to go with
UIApplication.shared.keyWindow?.addSubview(loaderView)

otherwise

self.view.window?.addSubview(loaderView)

is fine.