ios - 更改 AlertController 的布局

Question

我使用以下代码尝试使用 Nib 更改 UIAlertController 的布局，但是无论指定的 Nib 如何，对话框都会显示并且每次看起来都一样，它看起来像一个半透明的灰色框，在底部我的屏幕。

class AlertDialogViewController: UIViewController {

var message: String = ""

override init() {
    super.init(nibName: "SignUpViewController", bundle: nil)
    //Below two lines are important for custom transitions.
    transitioningDelegate = self
    modalPresentationStyle = .Custom
}

required init(coder aDecoder: NSCoder) {
    super.init(coder: aDecoder)
}

//Other code for your dialog controller
// .
// .
// .
}

extension AlertDialogViewController : UIViewControllerAnimatedTransitioning {

func transitionDuration(transitionContext: UIViewControllerContextTransitioning) -> NSTimeInterval {
    return 0.5 //Add your own duration here
}

func animateTransition(transitionContext: UIViewControllerContextTransitioning) {
//Add presentation and dismiss animation transition here.
}
}

extension AlertDialogViewController : UIViewControllerTransitioningDelegate {

func animationControllerForPresentedController(presented: UIViewController, presentingController presenting: UIViewController, sourceController source: UIViewController) -> UIViewControllerAnimatedTransitioning? {
    return self
}

func animationControllerForDismissedController(dismissed: UIViewController) -> UIViewControllerAnimatedTransitioning? {
    return self
}

}

extension UIViewController {

func showAleartWithMessage(message: String) {
    var ad = AlertDialogViewController()
    ad.message = message
    presentViewController(ad, animated: true, completion: nil)
}
}

Answer 1

你不能

The UIAlertController class is intended to be used as-is and does not support subclassing. The view hierarchy for this class is private and must not be modified.

编辑:添加了我在评论中所说的相关代码

假设您想要一个带有一个 UILable 和两个 UIButtons 实例的对话框

class CustomView : UIView {
   var commentLabel: UILable!
   var okayButton: UIButton!
   var cancelButton: UIButton!

   init(frame: CGRect) {
     super.init(frame: frame) 

     commentLabel = UILabel()
     okayButton = UIButton.buttonWithType(.Custom)
     cancelButton = UIButton.buttonWithType(.Custom)

     // TODO: Configuration such target, action, titleLable, etc. left to the user 

     [commentLabel, okayButton, cancelButton].map { self.addSubview($0) }
   }

   @IBAction func okayButtonAction(sender: AnyObject) {
      // TODO: Complete implementation
    }

   @IBAction func okayButtonAction(sender: AnyObject) {
      // TODO: Complete implementation
   }

}


class CustomAlertDialogViewCongroller : UIViewController {
  override func loadView() {
    self.view = CustomView(frame: CGRect(x: 0, y: 0, width: 200, height: 100))
  }
}

// In the view controller that you want to present that alert dialog. Let's call it viewController

let customAlertDialogViewController = CustomAlertDialogViewCongroller()
customAlertDialogViewController.modalPresentationStyle = .UIModalPresentationFormSheet
customAlertDialogViewController.modalTransitionStyle = .CoverVertical

viewController.presentViewController(customAlertDialogViewController, animated: true, completion: nil)