Getting the Value of a Uitextfield as Keystrokes Are Entered

Getting the Value of a UITextField as keystrokes are entered?

It turns out, the easiest way to do this is using Interface Builder:

• Add a IBAction (to the ViewController, say, as in this case)
• Ctrl-Click (or right click) on the UITextField in Interface Builder
• Connect the "Editing Changed" event to the File's Owner's IBAction added in the first step.

Works like a charm :) (I can't believe I spent numerous days on this, and to realize now that the solution was much simpler than I'd thought :P)

iPhone how to get UITextField's text while typing?

1. First add one UITextField and UILabel to storyboard / nib
2. Now assign IBOutlet for UILabel (Here I have used myLabel)
3. Assign UITextFieldDelegate to file owner, also implement the same delegate in .h file

4. Use these lines of code:

   - (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
   {
       NSString *newString = [textField.text stringByReplacingCharactersInRange:range withString:string];
       [self updateTextLabelsWithText: newString];
   
       return YES;
   }
   
   -(void)updateTextLabelsWithText:(NSString *)string
   {
        [myLabel setText:string];
   }
   

Hope this helps.

What is a simple way to get the entire text that is inside a UITextField as it is being typed?

I wouldn't even deal with the delegate. Just use UITextFieldTextDidChangeNotification to be informed of the change after the fact. Then you don't have to worry about appending the changes to the string, you can just access the text as a whole.

[[NSNotificationCenter defaultCenter] addObserverForName:UITextFieldTextDidChangeNotification object:nil queue:[NSOperationQueue mainQueue] usingBlock:^(NSNotification *note) {
    NSString *string = someTextFieldReference.text;
}];

Or as pointed out in the answers in the post @warpedspeed linked, you could just add a target for the text field's editing changed control event, like so:

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

- (void)textFieldDidChange:(UITextField *)sender
{
    NSLog(@"%@",sender.text);
}

Enabling a specific UITextField if another UITextField has a certain value

As you're using a UIPickerView as input, you should look at your picker view didSelectRow (which I guess you are using to populate your cDiseasePicker textfield) to configure the other textfield to your liking.

If I understand correctly the key information you need is that textFieldDidEndEditing method is called when the text field is no longer the first responder, not when the text changes.

How to get the TextField value when enter key is pressed in React?

Use onKeyDown event, and inside that check the key code of the key pressed by user. Key code of Enter key is 13, check the code and put the logic there.

Check this example:

class CartridgeShell extends React.Component {

   constructor(props) {

      super(props);

      this.state = {value:''}

      this.handleChange = this.handleChange.bind(this);

      this.keyPress = this.keyPress.bind(this);

   } 

 

   handleChange(e) {

      this.setState({ value: e.target.value });

   }

   keyPress(e){

      if(e.keyCode == 13){

         console.log('value', e.target.value);

         // put the login here

      }

   }

   render(){

      return(

         <input value={this.state.value} onKeyDown={this.keyPress} onChange={this.handleChange} fullWidth={true} />

      )

    }

}

ReactDOM.render(<CartridgeShell/>, document.getElementById('app'))

<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react.min.js"></script>

<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react-dom.min.js"></script>

<div id = 'app' />

Tricks to debugging UITextField

What you are asking is essentially;

How can I view private class data in the debugger and have it reflect what I expect?

The answers is basically that you can't. The _text field may be updated at a later date, or not used at all.

If you do want a way to debug what's entered in a UITextField you can consider using the textField:shouldChangeCharactersInRange in the delegate to print out characters are they're typed.

How to not allow the user to enter a value more than 190 in uitextfield?

How i would do it is set the the uiviewcontroller containing the uitextfield as the delegate of the text field. Then add this:

//If number of characters needs to be less than 190
- (BOOL)textField:(UITextField *)textField 
        shouldChangeCharactersInRange:(NSRange)range 
        replacementString:(NSString *)string 
{
    NSString *newString = [textField.text stringByReplacingCharactersInRange:range withString:string];
    if([newString length]>190){
        return NO;
    }
    return YES;
}

//If value needs to be less than 190
- (BOOL)textField:(UITextField *)textField 
    shouldChangeCharactersInRange:(NSRange)range 
    replacementString:(NSString *)string   
{
    NSString *newString = [textField.text stringByReplacingCharactersInRange:range withString:string];
    if([newString intValue]>190){
        return NO;
    }
    return YES;
}

Getting value of UIPickerView to UITextField and keep it on the bottom when rotating

Is there any reason you can't just do this?

- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component {

    [filiaalSelection setText:(NSString *)[stringsArray objectAtIndex:row]];
}

As for the done button, to make things easy for yourself you should make the picker view the text fields inputView. Then it will be automatically shown and dismissed when the field begins or ends editing (when [textfield resignFirstResponder]; is called).

You can then either add the button to the view somewhere or set it as the text field's inputAccessoryView if you want it to be attached to the top of the picker view.

iOS UITextField value without tapping on RETURN button

If you change:

-(BOOL)textFieldShouldReturn:(UITextField *)textField
{
    [textField resignFirstResponder];

    if (textField.text)
    {
        [self.cellInfoDictionary setObject:textField.text
                                    forKey:@"value"];
    }

    return NO;
}

to:

-(BOOL)textFieldShouldReturn:(UITextField *)textField
{
    [textField resignFirstResponder];
    if (textField.text)
    {
        [self.cellInfoDictionary setObject:textField.text
                                    forKey:@"value"];
    }
    return NO;
}

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {

    if (textField.text)
    {
        [self.cellInfoDictionary setObject:[textField.text stringByReplacingCharactersInRange:range withString:string]
                                    forKey:@"value"];
    }

    return YES;
}

everything should work as expected

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