How to fetch the width and height of a programatically added view in Swift/ iOS? - ios

Question

I have added a UIView and a UIImageView programatically, but I need its width and height.
Is it possible to fetch it, if yes, please share how to fetch it.
Code:
let View1: UIView = {
let viewView = UIView()
viewView.translatesAutoresizingMaskIntoConstraints = false
viewView.contentMode = .scaleAspectFit
print(UserDefaults.standard.bool(forKey: "backgroundColourSelected"))
if UserDefaults.standard.bool(forKey: "backgroundColourSelected") {
viewView.backgroundColor = self.viewColor
}else {
viewView.backgroundColor = .white
}
viewView.clipsToBounds = true
return viewView
}()
self.canvasView.addSubview(View1)
View1.centerXAnchor.constraint(equalTo: canvasView.centerXAnchor, constant: 0).isActive = true
View1.centerYAnchor.constraint(equalTo: canvasView.centerYAnchor, constant: 0).isActive = true
View1.widthAnchor.constraint(equalTo: canvasView.widthAnchor, constant: 0).isActive = true
View1.heightAnchor.constraint(equalTo: canvasView.widthAnchor, multiplier: aspectRatio).isActive = true

Answer 1

You need to know the life cycle of view controller.
To get height of any view use viewDidLayoutSubviews.
override func viewDidLayoutSubviews() {
super.viewDidLayoutSubviews()
print(view1.frame.size)
}
size property will print both final height and width.

Answer 2

use override func viewWillLayoutSubviews() for ViewController and override func layoutSubviews() for UIView.
Example : - for UIViewControllers
override func viewWillLayoutSubviews() {
print(yourView.frame.height)
}
for UIViews
override func layoutSubviews() {
print(yourView.frame.height)
print(yourView.frame.width)
}
Since your view is inside the function just move it out
class YourController / YourView {
private let imgView: UIImageView = {
let iv = UIImageView()
// do whatever you want with your image using iv. eg. iv.contentMode = .scaleAspectFit or iv.image = UIImage(named: "custom_img")
return iv
}()
override func viewDidLoad() {
super.viewDidLoad()
view.addSubview(imgView)
//set constraints for your
}
// then use layoutSubViews(for views) / viewWillLayoutSubViews (for controller) and calculate the height
}