ios - UITextView data change swift

Question

How can you detect a change of data in a UITextView with Swift? The following code does not do any detection.

I am declaring the UITextView :

@IBOutlet weak var bodyText: UITextView!

optional func textViewDidChange(_ textView: UITextView!) {
    println(bodyText.text)
}

Thanks Scott

question from:https://stackoverflow.com/questions/25064465/uitextview-data-change-swift

Answer 1

You need to set UITextView delegate and implement textViewDidChange: method in it. Unfortunately, I do not know if swift documentation is available online. All the links go to the objective-c documentation.

The code will look like this: (updated for SWIFT 4.2)

class ViewController: UIViewController, UITextViewDelegate { //If your class is not conforms to the UITextViewDelegate protocol you will not be able to set it as delegate to UITextView

    @IBOutlet weak var bodyText: UITextView!

    override func viewDidLoad() {
        super.viewDidLoad()
        bodyText.delegate = self //Without setting the delegate you won't be able to track UITextView events
    }

    func textViewDidChange(_ textView: UITextView) { //Handle the text changes here
        print(textView.text); //the textView parameter is the textView where text was changed
    }
}