How to Detect Text View Begin Editing and End Editing in Swift 3

Detect Start and Stop Editing UITextView

http://developer.apple.com/library/ios/#documentation/uikit/reference/UITextViewDelegate_Protocol/Reference/UITextViewDelegate.html#//apple_ref/occ/intf/UITextViewDelegate

Here you can find several useful methods to investigate:

• textViewDidBeginEditing:
• textViewDidEndEditing:

Moreover to leave UITextView you often should implement action that calls [yourTextView resignFirstResponder];

Objective-C example

//you may specify UITextViewDelegate protocol in .h file interface, but it's better not to expose it if not necessary
@interface ExampleViewController()<UITextViewDelegate> 

@end

@implementation ExampleViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    //assuming _textView is already instantiated and added to its superview
    _textView.delegate = self;
}

//it's nice to separate delegate methods with pragmas but it's up to your local code style policy
#pragma mark UITextViewDelegate

- (void)textViewDidBeginEditing:(UITextView *)textView {
    //handle user taps text view to type text
}

- (void)textViewDidEndEditing:(UITextView *)textView {
    //handle text editing finished    
}

@end

Swift Example

class TextViewEventsViewController: UIViewController, UITextViewDelegate {
    
    @IBOutlet weak var exampleTextView: UITextView!

    override func viewDidLoad() {
        super.viewDidLoad()
        
        self.exampleTextView.delegate = self
    }
    
    func textViewDidBeginEditing(_ textView: UITextView) {
        print("exampleTextView: BEGIN EDIT")
    }
    
    func textViewDidEndEditing(_ textView: UITextView) {
        print("exampleTextView: END EDIT")
    }
}

Detect when a UITextView has been edited

To do this, you need to conform to the UITextViewDelegate protocol and then set the textView's delegate to self.

So, after UIViewController on the beginning of this view controller, you need to add the protocol conformance. Example

class MyViewController: UIViewController, UITextViewDelegate {

then set the delegate in viewDidLoad():

override func viewDidLoad() {
    super.viewDidLoad()
    textView.delegate = self
}

Now, you're set up for success. All of the delegate methods on UITextViewDelegate are optional, so you only need to implement the ones you want. In this case, the one you want to implement is func textViewDidChange(_ textView: UITextView)

That method will get triggered every single time the text in the text field updates.

how to detect which textview is being edited swift

As long as you have properties that refer to the two text views you can simply see which one was passed to your delegate and act accordingly:

func textViewDidChange(textView: UITextView) { //Handle the text changes here

    guard let currentUser = PFUser.currentUser() else {
        return
    }
    if (textView == self.bioTextView){
        currentUser["bio"] = textView.text
        currentUser.saveInBackground()
    } else {
        currentUser["displayName"] = textView.text
        currentUser.saveInBackground()
    }
}

textViewDidBeginEditing on 2 separate textViews in swift

you need to change private func textViewDidBeginEditing2(_ definitionTextView: UITextView) to func textViewDidBeginEditing(_ definitionTextView: UITextView)

How do I check when a UITextField changes?

SWIFT

Swift 4.2

textfield.addTarget(self, action: #selector(ViewController.textFieldDidChange(_:)), for: .editingChanged)

and

@objc func textFieldDidChange(_ textField: UITextField) {

}

SWIFT 3 & swift 4.1

textField.addTarget(self, action: #selector(ViewController.textFieldDidChange(_:)), for: .editingChanged)

and

func textFieldDidChange(_ textField: UITextField) {

}

SWIFT 2.2

textField.addTarget(self, action: #selector(ViewController.textFieldDidChange(_:)), forControlEvents: UIControlEvents.EditingChanged)

and

func textFieldDidChange(textField: UITextField) {
    //your code
}

OBJECTIVE-C

[textField addTarget:self action:@selector(textFieldDidChange:) forControlEvents:UIControlEventEditingChanged];

and textFieldDidChange method is

-(void)textFieldDidChange :(UITextField *) textField{
    //your code
}

How to detect when a TextView is selected but before it becomes first responder?

You can get your first responder reference before system shows the keyboard using UITextViewDelegate.textViewShouldBeginEditing(_:)

import UIKit

class ViewController: UIViewController, UITextViewDelegate {
    var currentFirstResponder: UITextView?
    
    // iOS will call this before it shows keyboard
    // If you return true, it will show keyboard
    // If you return false, it will not show keyboard
    func textViewShouldBeginEditing(_ textView: UITextView) -> Bool {
        currentFirstResponder = textView
        return true
    }
}

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