UITextFieldDelegate method not called

shouldchangecharactersinrange not called
shouldchangecharactersin not called
keyboardinputshoulddelete
textfielddidendediting
textfielddidbeginediting
textfieldshouldclear swift
textfieldshouldbeginediting
uitextfield editing changed programmatically

I'm following the Big Nerd Ranch iOS Programming book (Swift version) and I have this file.

import UIKit

class ConversionViewController: UIViewController, UITextFieldDelegate {

    @IBOutlet var celsiusLabel: UILabel!
    @IBOutlet var textField: UITextField!

    func textField(textField: UITextField, shouldChangeCharactersInRange range: NSRange, replacementString string: String) -> Bool {
        print("here")
        return true
    }

    //rest of the code here
}

For some reason, the textField delegate method is not called. I can't see the "here" log in my console. I have double checked the naming and syntax a lot of times. Any ideas?

You need set delegate of your text field to self.

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

UITextField delegate not called? |Apple Developer Forums, So, UITextFields are pretty simple. You set the delegate and it's supposed to be called for various functions. But even if you do not set a  When you create a UITextField in your setTextFields: method, you're never assigning it to your property. All you're doing is passing nil in to your method, and when you assign a value to the variable in your method, you're only assigning it within the context of that method. It doesn't go back and set the property.

Is this line present?

textField.delegate = self

UITextField delegate function not getting called : swift, UITextField delegate function not getting called. Solution below. I am trying to make a class that takes a UITextField , becomes its delegate, and limits the  The NSLog placed in each of the delegate protocol methods earlier helps to see the circumstances in which each delegate method is called. Conclusion The UITextFieldDelegate protocol methods provide a great opportunity to customize the behavior of a UITextField .

I was missing a _ in my function, after the first parenthesis:

This doesn't work:

func textFieldDidBeginEditing(textField: UITextField) {
}

This works:

func textFieldDidBeginEditing(_textField: UITextField) {
}

UITextViewDelegate methods on delegate not called on text input , Can this unregistration of UITextField notifications be documented some place so people won't be puzzled why the normal delegate behaviour  UITextFieldDelegate(NSObjectFlag) Constructor to call on derived classes to skip initialization and merely allocate the object. UITextFieldDelegate(IntPtr) A constructor used when creating managed representations of unmanaged objects; Called by the runtime.

you have to follow these step --

1- put delegate with class name .

class YourViewController: UIViewController,UITextFieldDelegate

2- assign the delegate in viewDidLoad method.

textField.delegate = self

3- add the delegate method --

func textFieldShouldBeginEditing(_ textField: UITextField) -> Bool
{
    // return NO to disallow editing.
    return true
}

func textFieldDidBeginEditing(_ textField: UITextField)
{
    // became first responder
}

func textFieldShouldEndEditing(_ textField: UITextField) -> Bool
{
    // return YES to allow editing to stop and to resign first responder status. NO to disallow the editing session to end
    return true
}

func textFieldDidEndEditing(_ textField: UITextField)
{
    // may be called if forced even if shouldEndEditing returns NO (e.g. view removed from window) or endEditing:YES called
}

func textFieldDidEndEditing(_ textField: UITextField, reason: UITextFieldDidEndEditingReason)
{
    // if implemented, called in place of textFieldDidEndEditing:
}

func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool
{
    // return NO to not change text
    return true
}


func textFieldShouldClear(_ textField: UITextField) -> Bool
{
    // called when clear button pressed. return NO to ignore (no notifications)
    return true
}

Extension Approach to Keeping UITextFields in Sight, Implementing the UITextFieldDelegate protocol allows us to know when your view controller code, but be sure to call the super of the methods (e.g. super. we implement the logic for making sure a text field is not occluded. UITextField delegate function not getting called Solution below I am trying to make a class that takes a UITextField , becomes its delegate, and limits the numbers given to it to a range (for example 0 to 100).

For this function:

func textFieldDidBeginEditing(_textField: UITextField) { }

make sure you don't mark it as private. e.g. don't to this:

private func textFieldDidBeginEditing(_textField: UITextField) { }

It won't get called if marked private.

UITextField Delegate, UITextField Delegate | iOS Tutorial. Similarly, there are methods in the UITextFieldDelegate that are called when a user has started and ended his [​nextResponder becomeFirstResponder]; } else { // Not found, so remove keyboard. Use that method to allow or prevent the editing of the text field’s contents. The text field becomes the first responder. In response, the system displays the keyboard (or the text field’s input view) and posts the keyboard Will Show Notification and keyboard Did Show Notification notifications as needed.

Why is my UITextField delegate method not called?, I tried with the delegate method -(void)textFieldDidEndEditing:(UITextField *)​textField but the method is not called (I put a NSLog to check). Could someone help  This method is called after the text field resigns its first responder status. You can use this method to update your delegate’s state information. For example, you might use this method to hide overlay views that should be visible only while editing. Implementation of this method by the delegate is optional.

UITextField Delegate “shouldChangeCharactersIn” not called for , I want the keyboard to be dismissed after fourth digit entry, but what's happening is the "shouldChange" delegate method is not called when the "fourthDigit" get  Apple documentation has explained it pretty nicely. Here, I'm quoting them: > The text field calls this method in response to the user pressing the built-in clear button.

iPhone – UITextField Delegate Methods…, Every component has some delegate methods which will be called when Step 4: Implement UITextFieldDelegate in the .h file. return NO;. Also, I could not get the delegate functions to be called. I tried setting the delegate to the viewController, to the parent view, and nothing worked. Finally I made a subclass for the text field, set the delegate to itself, and THAT sort of worked.

Comments
  • Have you connected the textfield's delegate outlet in IB, or set it explicitly in code?
  • Yes, I forgot to add this part. It works now. Thank you!
  • Yes, I forgot to add this part. It works now. Thank you!
  • Yes, I forgot to add this part. It works now. Thank you!