It doesn’t look like you’re ever establishing any auto layout constraints for the UIImageView (or MyView for that matter). Because of this, my guess is that even if the background color of the UIView is showing, the imageView’s frame is 0 height and 0 width. You should be able to see this when using the “Debug View Hierarchy” option within Xcode while running your app.
Here’s an example adjusting your code to include auto layout constraints for the view and the imageView which should allow the image to show up properly:
class MyViewController: UIViewController {
let myView = MyView()
override func viewDidLoad() {
super.viewDidLoad()
super.viewDidLoad()
myView.translatesAutoresizingMaskIntoConstraints = false
myView.backgroundColor = .systemPink
view.addSubview(myView)
myView.widthAnchor.constraint(equalToConstant: 50).isActive = true
myView.heightAnchor.constraint(equalToConstant: 50).isActive = true
myView.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
myView.centerYAnchor.constraint(equalTo: view.centerYAnchor).isActive = true
}
@IBAction @objc func changeImageFunc(_ sender: Any) {
// just an example image
let image = UIImage(systemName: "eraser")!
myView.setImage(image)
}
}
import UIKit
class MyView: UIView {
var imageView: UIImageView
override init(frame: CGRect) {
imageView = UIImageView()
imageView.translatesAutoresizingMaskIntoConstraints = false
super.init(frame: frame)
addSubview(imageView)
imageView.widthAnchor.constraint(equalTo: self.widthAnchor).isActive = true
imageView.heightAnchor.constraint(equalTo: self.heightAnchor).isActive = true
imageView.centerXAnchor.constraint(equalTo: self.centerXAnchor).isActive = true
imageView.centerYAnchor.constraint(equalTo: self.centerYAnchor).isActive = true
}
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
func setImage(_ image: UIImage) {
// Set the image for the internal UIImageView
imageView.image = image
}
}
Which results in: