let optionMenu = UIAlertController(title: nil,message: "Choose Option",preferredStyle: UIAlertControllerStyle.ActionSheet)

    let action = UIAlertAction(title: "Action 1",style: .Default,handler: {
        (alert: UIAlertAction!) -> Void in
        print("Cancelled")
    })

    let action2 = UIAlertAction(title: "Action 2",handler: {
        (alert: UIAlertAction!) -> Void in
        print("Cancelled")
    })

    let cancelAction = UIAlertAction(title: "Cancel",style: .Cancel,handler: {
        (alert: UIAlertAction!) -> Void in
        print("Cancelled")
    })

    optionMenu.addAction(cancelAction)
    optionMenu.addAction(action)
    optionMenu.addAction(action2)

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

这就是它在屏幕上的样子.选项很暗(我相信拉入或受到后视图的影响).

Dimmed Options

我能够添加这个代码,使它纯白色,但分离的好处消失了.

let subview = optionMenu.view.subviews.first! as UIView
let alertContentView = subview.subviews.first! as UIView
alertContentView.backgroundColor = UIColor.whiteColor()
alertContentView.layer.cornerRadius = 2

它看起来像这样：Non-dimmed,but not quite right

关于如何不让背景影响UIAlertController中的选项的任何想法？

我将这个UIAlertController添加到一个白色背景的页面,看起来应该是这样.

谢谢！