swift – 如何更改UIAlertController高度?

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我创建了一个UIAlertController
let alertC = UIAlertController(title: "Title",message: "Message",preferredStyle: UIAlertControllerStyle.Alert)
alertC.addTextFieldWithConfigurationHandler(addTextField)
alertC.addAction(UIAlertAction(title: "Cancel",style: UIAlertActionStyle.Default,handler: nil))
alertC.addAction(UIAlertAction(title: "OK",handler: okButton))
presentViewController(alertC,animated: true,completion: nil)

但之后我想改变UIAlertController的高度?我怎样才能做到这一点?

我发现在呈现视图控制器之前可以添加约束
let alertController = UIAlertController(title: nil,message: "hello",preferredStyle: .Alert)


    let cancelAction = UIAlertAction(title: "Cancel",style: .Cancel) { (action) in
        // hide action sheet
    }
    alertController.addAction(cancelAction)


    var height:NSLayoutConstraint = NSLayoutConstraint(item: alertController.view,attribute: NSLayoutAttribute.Height,relatedBy: NSLayoutRelation.Equal,toItem: nil,attribute: NSLayoutAttribute.NotAnAttribute,multiplier: 1,constant: self.view.frame.height * 0.80)
    alertController.view.addConstraint(height);
    self.presentViewController(alertController,completion: nil)

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