Actionsheet presentation style option

[spnkr]

Use showAsActionSheet() instead of show() to present the alert as an action sheet (iPhone only). On iPads, the alert is always shown with the alert style. See below.

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Why no actionSheet style on iPads?

On iPads, presenting a UIAlertController requires a sender (UIBarButtonItem), or an explicit frame. this is easy enough to do using AlertManager.sharedInstance.parentController. But then the alert doesn't support device rotation. easier to just ignore the request for the actionSheet style on devices that use popoverPresentationControllers.

to see what i mean, replace this

AlertManager.sharedInstance.parentController.present(alertController, animated: true, completion: nil)

with this

if let popoverController = alertController.popoverPresentationController {
  popoverController.sourceView = AlertManager.sharedInstance.parentController.view
  popoverController.sourceRect = CGRect(x: AlertManager.sharedInstance.parentController.view.bounds.midX, y: AlertManager.sharedInstance.parentController.view.bounds.midY, width: 0, height: 0)
  popoverController.permittedArrowDirections = []
}
AlertManager.sharedInstance.parentController.present(alertController, animated: true, completion: nil)

on an ipad and try rotation.

[spnkr]

Oh yeah, the iOS target for the demo project is ios 13.1. but the base library is unchanged, at 10.0.