Autolayout constraints set in code not appearing in interface builder - swift

Question

I have a custom view that is set in interface builder with top, leading, trailing, height constraints.
In my Custom view i have a title and a button.
Im trying to add to the title a bottom and centerY constraints.
and to the button width, height, bottom, leading constraints.
When i add any constraint i get an warning in interface builder:
Expected: width=600, height=68.
Actual: width=0, height=0
When i run the code everything works, but i cant see anything in interface builder.
code:
#IBDesignable
class UIHeader: UIView {
var delegate: HeaderDelegate?
private lazy var titleLable: UILabel = {
let lbl = UILabel()
lbl.translatesAutoresizingMaskIntoConstraints = false
lbl.font = UIFont(name: "Lato-Light", size: 16)
lbl.text = "Title"
return lbl
}()
private lazy var backButton: UIButton = {
let btn = UIButton()
btn.tintColor = UIColor.lightGrayColor()
btn.translatesAutoresizingMaskIntoConstraints = false
let image = UIImage(named: "prev")
if let image = image {
btn.setImage(image.imageWithRenderingMode(.AlwaysTemplate), forState: .Normal)
}
btn.addTarget(self, action: #selector(UIHeader.OnBackButtonClickLister(_:)), forControlEvents: .TouchUpInside)
return btn
}()
override init(frame: CGRect) {
super.init(frame: frame)
setupView()
}
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
setupView()
}
}
extension UIHeader {
#IBInspectable
var backButtonImage: UIImage? {
get {
return backButton.imageForState(.Normal)
}
set (newImage) {
backButton.setImage(newImage?.imageWithRenderingMode(.AlwaysTemplate), forState: .Normal)
}
}
#IBInspectable
var title: String? {
get {
return titleLable.text
}
set (newTitle) {
titleLable.text = newTitle
}
}
}
extension UIHeader {
private func setupView() {
backgroundColor = UIColor.whiteColor()
translatesAutoresizingMaskIntoConstraints = false
addSubview(titleLable)
addSubview(backButton)
//add shadow
layer.shadowColor = UIColor(white: 115/255, alpha: 1.0).CGColor
layer.shadowOpacity = 0.5
layer.shadowRadius = 8
layer.shadowOffset = CGSizeMake(0, -1)
NSLayoutConstraint.activateConstraints([
//Title//
//center x
NSLayoutConstraint(item: titleLable, attribute: .CenterX, relatedBy: .Equal, toItem: self, attribute: .CenterX, multiplier: 1.0, constant: 0),
//bottom
NSLayoutConstraint(item: self, attribute: .Bottom, relatedBy: .Equal, toItem: titleLable, attribute: .Bottom, multiplier: 1, constant: 12),
//button//
//bottom
NSLayoutConstraint(item: self, attribute: .Bottom, relatedBy: .Equal, toItem: backButton, attribute: .Bottom, multiplier: 1, constant: 4),
//leading
NSLayoutConstraint(item: backButton, attribute: .Leading, relatedBy: .Equal, toItem: self, attribute: .Leading, multiplier: 1, constant: 0),
//width
NSLayoutConstraint(item: backButton, attribute: .Width, relatedBy: .Equal, toItem: nil, attribute: .Width, multiplier: 1, constant: 40),
//height
NSLayoutConstraint(item: backButton, attribute: .Height, relatedBy: .Equal, toItem: nil, attribute: .Height, multiplier: 1, constant: 40)
])
}
}
I also tried to add the constraints with:
addConstraint(NSLayoutConstraint)
cant figure out what is the problem.
Thanks

Answer 1

I removed
translatesAutoresizingMaskIntoConstraints = false
and everything works great.