Update Dec 16, 2019:
Just present the view controller/alert from the current top-most view controller. That will work 🙂
if #available(iOS 13.0, *) {
if var topController = UIApplication.shared.keyWindow?.rootViewController {
while let presentedViewController = topController.presentedViewController {
topController = presentedViewController
}
topController.present(self, animated: true, completion: nil)
}
Update July 23, 2019:
IMPORTANT
Apparently the method below this technique stopped working in iOS 13.0 🙁
I’ll update once I find the time to investigate…
Old technique:
Here’s a Swift (5) extension for it:
public extension UIAlertController {
func show() {
let win = UIWindow(frame: UIScreen.main.bounds)
let vc = UIViewController()
vc.view.backgroundColor = .clear
win.rootViewController = vc
win.windowLevel = UIWindow.Level.alert + 1 // Swift 3-4: UIWindowLevelAlert + 1
win.makeKeyAndVisible()
vc.present(self, animated: true, completion: nil)
}
}
Just setup your UIAlertController, and then call:
alert.show()
No more bound by the View Controllers hierarchy!