How to use UITextView in UIAlertController

Question

I created a popup alert using alert controller and added two alert actions(ok and cancel) as below.

UIAlertController * alert=   [UIAlertController
                  


        

Answer 1

Fantastic solutions above. Some needed some manipulation to work for Swift 4.2, here is the conversion for that. I've also added some padding in the TextView to make it athletically more pleasing.

let textView = UITextView(frame: CGRect.zero)

@IBAction func alert(_ sender: Any) {

    let alertController = UIAlertController(title: "\n\n\n\n\n", message: nil, preferredStyle: .alert)

    textView.textContainerInset = UIEdgeInsets.init(top: 8, left: 5, bottom: 8, right: 5)

    let saveAction = UIAlertAction(title: "OK", style: .default) { (action) in
        self.label.text = self.textView.text
        alertController.view.removeObserver(self, forKeyPath: "bounds")
    }

    saveAction.isEnabled = false

    let cancelAction = UIAlertAction.init(title: "Cancel", style: .default) { (action) in
        alertController.view.removeObserver(self, forKeyPath: "bounds")
    }

    alertController.view.addObserver(self, forKeyPath: "bounds", options: NSKeyValueObservingOptions.new, context: nil)

    NotificationCenter.default.addObserver(forName: UITextView.textDidChangeNotification, object: textView, queue: OperationQueue.main) { (notification) in
        saveAction.isEnabled = self.textView.text != ""
    }

    textView.backgroundColor = UIColor.white
    alertController.view.addSubview(self.textView)

    alertController.addAction(saveAction)
    alertController.addAction(cancelAction)

    self.present(alertController, animated: true, completion: nil)


}


override func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?) {
    if keyPath == "bounds"{
        if let rect = (change?[NSKeyValueChangeKey.newKey] as? NSValue)?.cgRectValue {
            let margin:CGFloat = 8.0
            textView.frame = CGRect.init(x: rect.origin.x + margin, y: rect.origin.y + margin, width: rect.width - 2*margin, height: rect.height / 2)
            textView.bounds = CGRect.init(x: rect.origin.x + margin, y: rect.origin.y + margin, width: rect.width - 2*margin, height: rect.height / 2)
        }
    }
}