How to change the background color of the UIAlertController?

Question

Due to strange behavior of UIActionSheet in iOS 8, I have implemented UIAlertController with UIAction as buttons in it. I would like to change the entire background of the U

Answer 1

For Objective - C Code May be Like.

UIAlertController * alert=[UIAlertController alertControllerWithTitle:@"Title"
                                                              message:@"Message"
                                                       preferredStyle:UIAlertControllerStyleAlert];
UIView *firstSubview = alert.view.subviews.firstObject;
UIView *alertContentView = firstSubview.subviews.firstObject;
for (UIView *subSubView in alertContentView.subviews) {
    subSubView.backgroundColor = [UIColor colorWithRed:255/255.0f green:255/255.0f blue:255/255.0f alpha:1.0f];
}
UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:@"Cancel" style:UIAlertActionStyleDefault handler:^(UIAlertAction * action){
   //Close Action
}];
[alert addAction:cancelAction];
[self presentViewController:alert animated:YES completion:nil];

Answer 2

Swift3

Step into one more layer compare with swift2

    let subview1 = alert.view.subviews.first! as UIView
    let subview2 = subview1.subviews.first! as UIView
    let view = subview2.subviews.first! as UIView

    subview.backgroundColor = backgroundColor
    view.backgroundColor = backgroundColor
    view.layer.cornerRadius = 10.0
    
    // set color to UILabel font
    setSubviewLabelsToTextColor(textColor, view: view)
    
    // set font to alert via KVC, otherwise it'll get overwritten
    let titleAttributed = NSMutableAttributedString(
        string: alert.title!,
        attributes: [NSFontAttributeName:UIFont.boldSystemFont(ofSize: 17)])
    alert.setValue(titleAttributed, forKey: "attributedTitle")
    
    let messageAttributed = NSMutableAttributedString(
        string: alert.message!,
        attributes: [NSFontAttributeName:UIFont.systemFont(ofSize: 13)])
    alert.setValue(messageAttributed, forKey: "attributedMessage")

    // set the buttons to non-blue, if we have buttons
    if let buttonColor = buttonColor {
        alert.view.tintColor = buttonColor
    }

Answer 3

I have found a hack-ish way of doing it. First you need an extension to allow you to search for the UIVisualEffectView inside the UIAlertController:

extension UIView
{
    func searchVisualEffectsSubview() -> UIVisualEffectView?
    {
        if let visualEffectView = self as? UIVisualEffectView
        {
            return visualEffectView
        }
        else
        {
            for subview in subviews
            {
                if let found = subview.searchVisualEffectsSubview()
                {
                    return found
                }
            }
        }

        return nil
    }
}

Important: You have to call this function after calling presentViewController, because only after loading the view controller that the visual effects view is inserted into place. Then you can change the effect associated with it to a dark blur effect:

self.presentViewController(actionController, animated: true, completion: nil)

if let visualEffectView = actionController.view.searchVisualEffectsSubview()
{
    visualEffectView.effect = UIBlurEffect(style: .Dark)
}

And this is the final result:

I am honestly surprised myself how well it works! I think this is probably something Apple forgot to add. Also, I haven't yet passed an App through approval with this "hack" (it isn't a hack because we're only using public APIs), but I'm confident there won't be a problem.

Answer 4

for Swift 3/ Swift 4

let subview =(alert.view.subviews.first?.subviews.first?.subviews.first!)! as UIView

            subview.backgroundColor = UIColor(red: (145/255.0), green: (200/255.0), blue: (0/255.0), alpha: 1.0)

            alert.view.tintColor = UIColor.black

.