Get frame size in updateConstraint function of Custom UIView - ios

Question

I'm setting constraints for views (UILabel, UIImageView) in custom UIView inside UpdateConstraint functions like below. As seen, I'm getting views' height and use it inside auto layout. I know I can get frame size in layoutSubviews function. If I call updateConstraint() function inside layoutSubViews , everything works fine but I don't know If It is the best approach.
In addition when I try to set frame in layoutSubViews() with label.frame = CGRect.. (without auto layout) nothing happens and I can't see custom views inside superview.
override func updateConstraints() {
logoImage.anchor(self.topAnchor, left: self.leftAnchor, bottom: self.bottomAnchor, right: self.rightAnchor, topConstant: 0, leftConstant: 0, bottomConstant: self.frame.height / 2, rightConstant: 0, widthConstant: 0, heightConstant: 0)
label.anchor(self.logoImage.bottomAnchor, left: self.leftAnchor, bottom: nil, right: self.rightAnchor, topConstant: 12, leftConstant: 0, bottomConstant: 0, rightConstant: 0, widthConstant: 0, heightConstant: 0)
super.updateConstraints()
}
override func layoutSubviews() {
print(self.frame.height)
updateConstraints()
}
I searched below posts but can't find any solution;
Where to get frame size of custom UIView in its subclass
Subview of Custom UIView has wrong x frame position

Answer 1

No need to handle that in layoutSubviews if your current constraint create extension sets isActive = true then it will have the correct frame
//
correct way of creating a customView
class CustomView : UIView {
var imageV = UIImageView()
var once = true
override init(frame: CGRect) {
super.init(frame: frame)
sharedLayout()
}
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
sharedLayout()
}
func sharedLayout() {
// set constraints here
self.addSubview(imageV)
}
override func layoutSubviews() {
if once {
self.imageV.translatesAutoresizingMaskIntoConstraints = false
self.imageV.leadingAnchor.constraint(equalTo: self.leadingAnchor).isActive = true
self.imageV.trailingAnchor.constraint(equalTo: self.leadingAnchor).isActive = true
self.imageV.topAnchor.constraint(equalTo: self.topAnchor).isActive = true
self.imageV.bottomAnchor.constraint(equalTo: self.bottomAnchor).isActive = true
once = false
}
}
}