objective c how to set maximum limit value on the UItextfield

Question

NOTE: Not to set the Charecter limit, asking for Value of the field limit

In my application I have a uitext field to enter cost of an item.

I can able to restrict the text field to enter only numeric values , that too some specific number of charecters,

But i need to restctrict the textfield to allow only some range of cost only.

i.e i need to restrict cost only 800/- only

if the user tries to type 900 or some thing more than 800 it wont allow to type anymore,

how can we achieve tis any help plese .. thanks

If you like to, you can check out my CKTextField (https://github.com/JaNd3r/CKTextField). It allows you to set simple validation rules (like max string length, max numeric value) via Storyboard. — Christian, Sep 30 '14 at 09:06

score 2 · Answer 1 · answered Sep 30 '14 at 09:23

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
    if (textField == myTextField) {
        if (string.length == 0) {
            return YES;
        }
        NSString *editedString = [myTextField.text stringByReplacingCharactersInRange:range withString:string];
        NSInteger editedStringValue = editedString.integerValue;
        return editedStringValue <= 800;
    }

    return YES;
}

score 1 · Answer 2 · answered Sep 30 '14 at 09:40

first set your textfield delegate...

yourTextField.delegate=self

then,

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string{
        NSString *str=[NSString stringWithFormat:@"%@%@",textField.text,string];
        if ([str integerValue]>800) {
            return NO;
        }
        else{
            return YES;
        }
    }

if You have more than one textfield then you need to assign tag value and put another condition to identify textfield and if you have only one text field use same code.

Ramesh Muthe · Answer 3 · 2014-09-30T09:51:23.703

0

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
    if([string isEqualToString:@""]) {
        return YES;
    }
     NSString *stringToValidate= [textField.text stringByReplacingCharactersInRange:range withString:string]];
        if([stringToValidate doubleValue]>800){
return NO;
}
return YES;
}

Check the above code and it can help you

edited Sep 30 '14 at 09:51

answered Sep 30 '14 at 09:08

Ramesh Muthe

811
7
15

That is not the correct way to generate the `stringToValidate` – DeFrenZ Sep 30 '14 at 09:19
Why this is not correct way, can you expalin @ Davide – Ramesh Muthe Sep 30 '14 at 09:22
With your implementation it's not possible to edit the string in positions different from the end. I wrote the correct code :) – DeFrenZ Sep 30 '14 at 09:25
Both code look's of same.You just wrote same as I except one line – Ramesh Muthe Sep 30 '14 at 09:28
1

Mostly it is, but that line makes a difference :) Try to write something not at the end of the textfield in your code and then tell me ;) – DeFrenZ Sep 30 '14 at 09:33
I have edited the code,check once is it fine now – Ramesh Muthe Sep 30 '14 at 09:40
It should be. But why do you check for `[string isEqualToString:@""]` again when you already know that it is not like that? (if it was, the method would have returned earlier) – DeFrenZ Sep 30 '14 at 09:42
Let us [continue this discussion in chat](http://chat.stackoverflow.com/rooms/62169/discussion-between-ramesh-muthe-and-davide-de-franceschi). – Ramesh Muthe Sep 30 '14 at 09:43

score -1 · Answer 4 · answered Sep 30 '14 at 08:59

-1

try this

handle the "Editing Changed" event

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

and the selector:

    -(void) editingChanged:(id)sender {
       // your code

}

answered Sep 30 '14 at 08:59

mond

38
6

In this way you can only do things **after** the editing happened. He wanted to stop the user to enter invalid values. – DeFrenZ Sep 30 '14 at 09:25

objective c how to set maximum limit value on the UItextfield

4 Answers4