更改 UIAlertcontroller 背景颜色

Question

好的，所以我有这个正在使用的警报，我希望它的背景是黑色而不是灰色。我设法更改了标题和消息的文本颜色，但没有更改背景颜色。好到我想要的颜色。我已将其更改为绿色蓝色和白色，但不是黑色。当我尝试将其更改为黑色时，它会变成灰色。任何建议都会有所帮助，我们将不胜感激。我在这里 How to change the background color of the UIAlertController? 尝试过，这就是我到达现在位置的方式。

这是我现在要做的：

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

试试这个

Swift2及以下

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;

更新答案swift 3 及以上

   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)

输出

iPhone

iPad

Answer 2

由于已知错误 (https://openradar.appspot.com/22209332)，已接受的解决方案不适用于 iOS 9。

在这里查看我的完整答案：

Answer 3

对于Objective C，下面的代码很有魅力。

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 4

Swift 4.1 :

这是最适合我的方式：

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 5

Swift 5
使用 UIAlertController 扩展只写一行代码。

alertController.setBackgroundColor(color: UIColor.black)

完整文档：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 6

如果有人想要不透明的白色背景颜色，他可以用这个衬垫来做到这一点：

UIVisualEffectView.appearance(whenContainedInInstancesOf: [UIAlertController.classForCoder() as! UIAppearanceContainer.Type]).backgroundColor = UIColor.white

但是请注意，这仅适用于白色，因为其他颜色会因默认视觉效果而出现不同。

Answer 7

让子视图 = (alert.view.subviews.first?.subviews.first?.subviews.first!)!作为 UIView subview.layer.cornerRadius = 1 subview.backgroundColor = UIColor.white

Answer 8

此图显示了警报视图结构

如果你想改变背景颜色，你应该改变第5个视图的背景颜色，例如，你可以这样改变：

 alert.view.subviews.forEach { v in
        v.subviews.forEach { v in
            v.subviews.forEach { v in
                v.subviews.forEach { v in
                    v.backgroundColor = .black
                }
            }
        }
    }

更改 UIAlertcontroller 背景颜色

change UIAlertcontroller background Color

ios

objective-c

swift

uialertcontroller