how to check that UITextField is empty or not?????????

Question

how to check that UITextField is empty or not?????????

Hello,

suppose i have two control one is textField and second is button for submitting to value of textField.

I can click on button then and then only i have entered values.

If i press button without put cursor on textField then it should give
me alert when textField has not any value.

I have tried like,

NSString *string = textField.text;
if(string isEqualToString:@"")
{
code of alert;
NSLog(@"textField is empty");
}

But its not working for me.

Then
if([string lenght]>0)
{
processing code
}
esle{
code for alert and ;;;;;
}

Its also not working for me.

Please anyone tell me where am i wrong????????????

Thanks.

Message was edited by: vavdiyaharesh

mac book, Mac OS X (10.5.4)

Posted on Aug 29, 2008 12:34 AM

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Answer 1

Best reply

schmapper

Level 1

5 points

Aug 29, 2008 2:01 AM in response to vavdiyaharesh

[textField.text length] > 0 works fine here

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Answer 2

Aug 29, 2008 3:25 AM in response to schmapper

Hello,

I use :


if ([textField.text length] == 0)
 ...blah blah...

all the time. Works fine ! Solution was given to me on this forum...
Try doing a quick forum search before you post, you will be surprised by all the answers you find !

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Answer 3

Aug 29, 2008 6:05 AM in response to Ostrowsky S

It's possible that someone put a space in your textfield and length won't return 0. You should perform a trim on it like:

NSString *value = [textField.text stringByTrimmingCharactersInSet:[[NSCharacterSet whitespaceCharacterSet]]];

This will provide with a nicely trimmed string and you can then test against length:

if([[value length]] == 0) {
// Alert the user they forgot something
}

Message was edited by: timothyBraun

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Answer 4

Aug 29, 2008 6:09 AM in response to timothyBraun

Thank u all of u for ur help

Reply

Answer 5

omarh93

Level 1

0 points

Oct 2, 2008 1:17 PM in response to timothyBraun

Thanks for the suggestion of trimming the string first! I had a similar problem but just checking the length of the text property wasn't working! Even if I clear out all the characters in the UITextfield, for some reason it still thinks there is 1 character there (a space i assume)...so trimming it before checking the length works great.

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