UITextView data change swift
Set delegate
of UITextView
.Refer UITextViewDelegate
Write this in viewDidLoad
bodyText!.delegate = self
For Swift 4:
func textViewDidChange(_ textView: UITextView) {
// Your code here
}
For my case, I wanted the implementation to be independent from a UIViewController, so i dont need to assign a delegate just for text changes. Or even maybe there is some kind of validation on the UITextView, and you wanna contain it per field instead of a delegate managing a lot of complicated logic.
It requires to subclass UITextView, but its very much worth it imo:
class TextView: UITextView {
convenience init() {
self.init(frame: CGRect.zero, textContainer: nil)
NotificationCenter.default.addObserver(self, selector: #selector(textDidChangeNotification), name: UITextView.textDidChangeNotification , object: nil)
}
deinit {
NotificationCenter.default.removeObserver(self)
}
@objc func textDidChangeNotification(_ notif: Notification) {
guard self == notif.object as? UITextView else {
return
}
textDidChange()
}
func textDidChange() {
// the text in the textview just changed, below goes the code for whatever you need to do given this event
// or you can just set the textDidChangeHandler closure to execute every time the text changes, useful if you want to keep logic out of the class
textDidChangeHandler?()
}
var textDidChangeHandler: (()->Void)?
}
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
}
}