Loading UIImagePickerController from subview - ios

Question

I'm trying to load an instance of UIImagePickerController from a custom subview. For some reason it doesn't work and keeps giving me:
<UIImagePickerController: 0x7fde7282bc00> on <UIViewController: 0x7fde6f507f00> whose view is not in the window hierarchy!
Here's a skeleton of what my code looks like:
View Controller
let subview = SubView()
// Subview params...
subview.parent = self
self.view.addSubview(subview)
Subview
class SubView: UIView, UIImagePickerControllerDelegate, UINavigationControllerDelegate {
let imagePicker = UIImagePickerController()
var parent = UIViewController()
override func draw(_ rect: CGRect) {
imagePicker.delegate = self
let add = UIButton()
// add params...
add.addTarget(self, action: #selector(addImg(_:)), for: .touchUpInside)
self.addSubview(add)
}
func addImg(_ sender: UIButton) {
imagePicker.allowsEditing = false
imagePicker.sourceType = .photoLibrary
parent.present(imagePicker, animated: true, completion: nil)
}
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
if let pickedImage = info[UIImagePickerControllerOriginalImage] as? UIImage {
// Do stuff with image
}
}
}
Any ideas on how I can get this working?

Answer 1

You can get current rootController using UIApplication. This is my working code. It will find the rootController and check if it is type of UINavigationController or UIViewController
if let rootController = UIApplication.shared.keyWindow?.rootViewController {
if rootController is UINavigationController {
if let navigationController = rootController as? UINavigationController {
if let topViewController = navigationController.topViewController {
topViewController.present(alert, animated: true, completion: nil)
}
}
}
else {
// is a view controller
rootController.present(alert, animated: true, completion: nil)
}
}