change UIAlertcontroller background Color - ios

Question

Ok so I have this alert that I am using and I want the background of it to be black not grey like it is. I have managed to change the colour of the text for the title and the message but not the background colour. Well to the desired colour I want. I have changed it to green blue and white, but not black. When I try to change it to black it turns grey. Any suggestions will help and be appreciated. I tried this here How to change the background color of the UIAlertController? and that is how I got to where I am now.
Here is what I have going now:
func showAlert(title:String, message:String) {
//Set up for the title color
let attributedString = NSAttributedString(string: title, attributes: [
NSFontAttributeName : UIFont.systemFontOfSize(15), //your font here,
NSForegroundColorAttributeName : UIColor.whiteColor()
])
//Set up for the Message Color
let attributedString2 = NSAttributedString(string: message, attributes: [
NSFontAttributeName : UIFont.systemFontOfSize(15), //your font here,
NSForegroundColorAttributeName : UIColor.whiteColor()
])
let alert = UIAlertController(title: title,message: message, preferredStyle: .Alert)
alert.setValue(attributedString, forKey: "attributedTitle")
alert.setValue(attributedString2, forKey: "attributedMessage")
//alert.view.tintColor = UIColor.whiteColor()
let dismissAction = UIAlertAction(title: "Dismiss", style: .Destructive, handler: nil)
alert.addAction(dismissAction)
self.presentViewController(alert, animated: true, completion: nil)
//set the color of the Alert
let subview = alert.view.subviews.first! as UIView
let alertContentView = subview.subviews.first! as UIView
alertContentView.backgroundColor = UIColor.blackColor()
//alertContentView.backgroundColor = UIColor.greenColor()
//Changes is to a grey color :(
/*
alertContentView.backgroundColor = UIColor(
red: 0,
green: 0,
blue: 0,
alpha: 1.0)
//Also another Grey Color Not batman black
*/
//alertContentView.backgroundColor = UIColor.blueColor()
//turns into a purple
}

Answer 1

Swift 4.1 :
This is the best way works for me :
func testAlert(){
let alert = UIAlertController(title: "Let's See ..",message: "It Works!", preferredStyle: .alert)
let dismissAction = UIAlertAction(title: "Dismiss", style: .default, handler: nil)
// Accessing alert view backgroundColor :
alert.view.subviews.first?.subviews.first?.subviews.first?.backgroundColor = UIColor.green
// Accessing buttons tintcolor :
alert.view.tintColor = UIColor.white
alert.addAction(dismissAction)
present(alert, animated: true, completion: nil)
}

Answer 2

try this
Swift2 and below
let subview :UIView = alert.view.subviews. first! as UIView
let alertContentView = subview.subviews. first! as UIView
alertContentView.backgroundColor = UIColor.blackColor()
Objective -C
UIView *subView = alertController.view.subviews.firstObject; //firstObject
UIView *alertContentView = subView.subviews.firstObject; //firstObject
[alertContentView setBackgroundColor:[UIColor darkGrayColor]];
alertContentView.layer.cornerRadius = 5;
updated answer swift 3 and above
let alert = UIAlertController(title: "validate",message: "Check the process", preferredStyle: .alert)
let dismissAction = UIAlertAction(title: "Dismiss", style: .destructive, handler: nil)
alert.addAction(dismissAction)
self.present(alert, animated: true, completion: nil)
// change the background color
let subview = (alert.view.subviews.first?.subviews.first?.subviews.first!)! as UIView
subview.layer.cornerRadius = 1
subview.backgroundColor = UIColor(red: (195/255.0), green: (68/255.0), blue: (122/255.0), alpha: 1.0)
output
iPhone
iPad

Answer 3

Swift 5
Write just one line of code using UIAlertController extension.
alertController.setBackgroundColor(color: UIColor.black)
Full documentation: http://www.swiftdevcenter.com/change-font-text-color-and-background-color-of-uialertcontroller/
extension UIAlertController {
//Set background color of UIAlertController
func setBackgroundColor(color: UIColor) {
if let bgView = self.view.subviews.first, let groupView = bgView.subviews.first, let contentView = groupView.subviews.first {
contentView.backgroundColor = color
}
}
//Set title font and title color
func setTitlet(font: UIFont?, color: UIColor?) {
guard let title = self.title else { return }
let attributeString = NSMutableAttributedString(string: title)//1
if let titleFont = font {
attributeString.addAttributes([NSAttributedString.Key.font : titleFont],//2
range: NSMakeRange(0, title.utf8.count))
}
if let titleColor = color {
attributeString.addAttributes([NSAttributedString.Key.foregroundColor : titleColor],//3
range: NSMakeRange(0, title.utf8.count))
}
self.setValue(attributeString, forKey: "attributedTitle")//4
}
//Set message font and message color
func setMessage(font: UIFont?, color: UIColor?) {
guard let message = self.message else { return }
let attributeString = NSMutableAttributedString(string: message)
if let messageFont = font {
attributeString.addAttributes([NSAttributedString.Key.font : messageFont],
range: NSMakeRange(0, message.utf8.count))
}
if let messageColorColor = color {
attributeString.addAttributes([NSAttributedString.Key.foregroundColor : messageColorColor],
range: NSMakeRange(0, message.utf8.count))
}
self.setValue(attributeString, forKey: "attributedMessage")
}
//Set tint color of UIAlertController
func setTint(color: UIColor) {
self.view.tintColor = color
}
}

Answer 4

For Objective C, the below code works like charm.
UIAlertController *alertController = [UIAlertController alertControllerWithTitle:#"Save changes?" message:nil preferredStyle:UIAlertControllerStyleAlert];
UIView *firstSubview = alertController.view.subviews.firstObject;
UIView *alertContentView = firstSubview.subviews.firstObject;
for (UIView *subSubView in alertContentView.subviews) { //This is main catch
subSubView.backgroundColor = [UIColor blueColor]; //Here you change background
}

Answer 5

Due to a known bug (https://openradar.appspot.com/22209332), the accepted solution doesn't work on iOS 9.
See my full answer here: https://stackoverflow.com/a/37737212/1781087

Answer 6

In case someone wants to have an opaque white background color he can do this with this one liner:
UIVisualEffectView.appearance(whenContainedInInstancesOf: [UIAlertController.classForCoder() as! UIAppearanceContainer.Type]).backgroundColor = UIColor.white
Note however this will work properly only with white color as other colors will appear differently because of the default visual effect.

Answer 7

let subview = (alert.view.subviews.first?.subviews.first?.subviews.first!)! as UIView
subview.layer.cornerRadius = 1
subview.backgroundColor = UIColor.white

Answer 8

This image shows an alert view structure
If you want to change the background color you should change the 5th view's background color, for example, you can change it like this:
alert.view.subviews.forEach { v in
v.subviews.forEach { v in
v.subviews.forEach { v in
v.subviews.forEach { v in
v.backgroundColor = .black
}
}
}
}