如何在Swift中旋转UIAlertController

Question

我有一个工作UIAlertController，但我想旋转alert.view左90度。

我该怎么办？我的代码是在这里如下：

let alert = UIAlertController(title: "", message: "Message Sample", preferredStyle: .Alert) 
alert.addAction(UIAlertAction(title: "Okay", style: .Default){(action)->() in }) 
presentViewController(alert, animated: true) {} 

我尝试添加：

alert.view.transform = CGAffineTransformMakeRotation(CGFloat(M_PI_2)) 

，但它不工作。

谢谢！

Answer 1

有了这个代码：

let alert = UIAlertController(title: "", message: "Message Sample", preferredStyle: .Alert) 
alert.addAction(UIAlertAction(title: "Okay", style: .Default){(action)->() in }) 

self.presentViewController(alert, animated: true, completion: {() -> Void in 
     alert.view.transform = CGAffineTransformMakeRotation(CGFloat(M_PI_2)) 

}) 

Swift3

let alert = UIAlertController(title: "", message: "Message Sample", preferredStyle: .alert) 
    alert.addAction(UIAlertAction(title: "Okay", style: .default){(action)->() in }) 

    self.present(alert, animated: true, completion: {() -> Void in 
     alert.view.transform = CGAffineTransform(rotationAngle: CGFloat(Double.pi/2)) 

    }) 

你可以做到这一点：

更新答案

self.presentViewController(alert, animated: true, completion: {() -> Void in 
     // alert.view.transform = CGAffineTransformMakeRotation(CGFloat(M_PI_2)) 

     UIView.animateWithDuration(1.0, delay: 0, options: .CurveLinear, animations: {() -> Void in 
      alert.view.transform = CGAffineTransformMakeRotation(CGFloat(M_PI_2)) 
     }) { (finished) -> Void in 
      // do something if you need 
     } 

    })