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validate text field iPhone
1 Answer(s)      3 years and 5 months ago
Posted in : MobileApplications


i got two different UITextfield in my iPhone application for user login. Just wondering how to validate it?


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April 8, 2011 at 2:35 PM


See the below given example ..that check for the string length and returns alert if the string length is greater than required one in UITextField.

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {
    if (range.location == 0 && string.length == 0) {
        return YES;
    }

    // Build up the resulting string?
    NSMutableString *fullString = [[NSMutableString alloc] init];

    [fullString appendString:[textField.text substringWithRange:NSMakeRange(0, range.location)]];
    [fullString appendString:string];

    // Set up number formatter?
    NSNumberFormatter *formatter = [[NSNumberFormatter alloc] init];
    NSNumber *replaceNumber = [formatter numberFromString:fullString];

    [fullString release];
    [formatter release];

    return !(replaceNumber == nil || [replaceNumber intValue] > 40);
}


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