Swift can't change imageview frame inside xib uiview

Question

I'm using Swift 3 and trying to change my UIImageView width and height that inside xib

This is my code:

let view = Bundle.main.loadNibNamed("Custom", owner: self, options: nil)?[0] as! UIView           
view.frame = CGRect(x: CGFloat(i) * self.sView.frame.size.width, y: self.sView.frame.origin.y, width: self.sView.frame.size.width, height: self.sView.frame.size.height)    

let imageView = view.viewWithTag(1) as! UIImageView

when I try to change the imageview frame like this

imageView.frame = CGRect(x: imageView.frame.origin.x, y: imageView.frame.origin.y - 40, width: 200, height: imageView.frame.height)

nothing change when I try to run it, please help me how to fix this problem

Answer 1

I end up set identifier for my constraint in my xib and call it from my controller like this

for subview in view.subviews {
            for constraint in subview.constraints as [NSLayoutConstraint] {
                if constraint.identifier == "imageWidth" {
                    constraint.constant = view.frame.width * 0.5
                }
            }
        }

and I can control the width, the height, the x and y from my controller