Multiline editable text UITextview inside UIAlertController?

Question

How can I make a multiline editable text UITextview inside a UIAlertController? UITextfield supports a single line and we need to make

Answer 1

I made a few tweaks to Vishal's approach.

1. Added UITextViewDelegate method to display an initial light gray text as a placeholder and remove it on textViewDidBeginEditing.

2. Set the textView border width, border color and background color to make it visible.

   class ViewController: UIViewController, UITextViewDelegate {
   
   ...
   
   @IBAction func showAlert(sender: AnyObject) {
       let alertController = UIAlertController(title: "Hello, I'm alert! \n\n\n\n\n\n\n", message: "", preferredStyle: .Alert)
   
       let rect        = CGRectMake(15, 50, 240, 150.0)
       let textView    = UITextView(frame: rect)
   
       textView.font               = UIFont(name: "Helvetica", size: 15)
       textView.textColor          = UIColor.lightGrayColor()
       textView.backgroundColor    = UIColor.whiteColor()
       textView.layer.borderColor  = UIColor.lightGrayColor().CGColor
       textView.layer.borderWidth  = 1.0
       textView.text               = "Enter message here"
       textView.delegate           = self
   
       alertController.view.addSubview(textView)
   
       let cancel = UIAlertAction(title: "Cancel", style: .Cancel, handler: nil)
       let action = UIAlertAction(title: "Ok", style: .Default, handler: { action in
   
           let msg = (textView.textColor == UIColor.lightGrayColor()) ? "" : textView.text
   
           print(msg)
   
       })
       alertController.addAction(cancel)
       alertController.addAction(action)
   
       self.presentViewController(alertController, animated: true, completion: {})
   
   }
   
   func textViewDidBeginEditing(textView: UITextView) {
       if textView.textColor == UIColor.lightGrayColor(){
           textView.text = ""
           textView.textColor = UIColor.darkGrayColor()
       }
   }
   }