Ipad UIAlertAction does not darken the surrounding color

Question

herrendevelop OP

Created Nov ’18

Replies 1

Boosts 0

Views 1.5k

Participants 3

I used the UIAlertController to display the popup.

On the iPhone, the pop-up is well visible and the surrounding color is dark.

However, the iPad has an error.

let alertVC = UIAlertController(title: nil, message: nil, preferredStyle: .actionSheet)

if UIDevice.current.userInterfaceIdiom == .pad

{

alertVC.popoverPresentationController?.sourceView = self

alertVC.popoverPresentationController?.sourceRect = CGRect(x: UIScreen.main.bounds.midX, y: UIScreen.main.bounds.maxY, width: 0, height: 0)

alertVC.popoverPresentationController?.permittedArrowDirections = []

}

// add alertVC.addAction()

DispatchQueue.main.async

{

guard let parentVC = self.parentViewController as? MoreViewController else { return }

parentVC.present(alertVC, animated: true, completion: nil)

}

I solved the error that occurred in the iPad through search.

However, when the Alert is displayed on the iPad, the surroundings do not become dark.

Please help me.

Boost

Answer 1

Claude31 OP

Nov ’18

AFAIK that's not an error but intended behavior.

In fact,

- on iPhone, you get a cancel button ; background is darkened to show it is inactive, because alert is modal

- on iPad, no cancel button ; you cancel by tapping on surrounding, which is active (non modal). That's why is does not darken.

Personal note: I usually prefer to set style to .alert for iPhone

        var alertStyle = UIAlertController.Style.alert = alertStyle = .alert
        if UIDevice.current.userInterfaceIdiom == .pad {
            alertStyle = UIAlertController.Style.actionSheet
        }
    let alertVC = UIAlertController(title: nil, message: nil, preferredStyle: alertStyle
    if UIDevice.current.userInterfaceIdiom == .pad {          
        alertVC.popoverPresentationController?.sourceView = self
        alertVC.popoverPresentationController?.sourceRect = CGRect(x: UIScreen.main.bounds.midX, y: UIScreen.main.bounds.maxY, width: 0, height: 0)
        alertVC.popoverPresentationController?.permittedArrowDirections = []
    }

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