title: UIAlertcontroller set attributed messages
body: <p>How we can set Attributed text in UIAlertcontroller as message. 
  My try code As bellow, but it will crash the app.</p>
  
  <pre><code>// create Attributed text
  
  let myAttribute = [NSForegroundColorAttributeName: UIColor(red:122.0/255, green:125.0/255, blue:131.0/255, alpha:1.0),NSFontAttributeName: Constant.flinntRegularFont(15)]
  let myAttribute2 = [NSForegroundColorAttributeName: UIColor.blackColor(),NSFontAttributeName: Constant.flinntMediumFont(15)]
  
  let myString = NSMutableAttributedString(string: "You have been unsubscribed from ", attributes: myAttribute)
  let myString2 = NSMutableAttributedString(string: self.course.course_name, attributes: myAttribute2)
  let myString3 = NSMutableAttributedString(string: "\n\nYour refund will be initiated within one week.", attributes: myAttribute)
  let myString4 = NSMutableAttributedString(string: "\n\nFor any help call us on", attributes: myAttribute)
  let myString5 = NSMutableAttributedString(string: " 079-4014 9800", attributes: myAttribute2)
  let myString6 = NSMutableAttributedString(string: " between 9:30 am to 6:30 pm on Monday to Saturday.\n\nWe will be always here with great deals to share.", attributes: myAttribute)
  
  myString.appendAttributedString(myString2)
  myString.appendAttributedString(myString3)
  myString.appendAttributedString(myString4)
  myString.appendAttributedString(myString5)
  myString.appendAttributedString(myString6)
  </code></pre>
  
  <p>Present UIAlertcontroller Code</p>
  
  <pre><code>let alert = UIAlertController(title: "", message: "Select course", preferredStyle: UIAlertControllerStyle.Alert)
      alert.setValue(myAttribute, forKey: "attributedMessage") // this line make a crash.
  
      alert.addAction(UIAlertAction(title: "OK", style: .Cancel, handler: { (action) in
          self.delegate?.courseRefundViewControllerCoursrRefunded?(self)
          self.navigationController?.popViewControllerAnimated(true)
      }))
  self.presentViewController(alert, animated: true, completion: nil)
  </code></pre>
  
  <p>Thanks.</p>
  
  <p><a href="https://i.stack.imgur.com/CfLoT.jpg" rel="noreferrer"><img src="https://i.stack.imgur.com/CfLoT.jpg" alt="enter image description here"></a></p>