How to set limit in text field? - iphone

Question

can any body tell me how to set the limit for words to enter in a text field in objective-c?
In my case i have a registration form and in registration form every user have to enter username, password, email and phone no. and now i have to restrict the user to enter a name of maximum 15 characters.
can any one tell me how i can do this?

Answer 1

You are able to restrict number of inputs in UITextField both following ways.
First of all, set relevant UIViewController as a delegate object to UITextField
yourTextField.delegate = self;
Then add the following code snippet to your UIViewController.
-(BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {
if ([textField.text length]<15) {
return YES;
}
return NO;
}
Or you can define UITextFieldDelegate protocol in your UIViewController interface
#interface YourViewController()<UITextFieldDelegate>
// YourViewController.m
#end
and then implement the following shouldChangeCharactersInRange task in your class.
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {
NSUInteger newLength = [textField.text length] + [string length] - range.length;
return (newLength > 15) ? NO : YES;
}

Answer 2

Try this:
-(BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {
NSString *textFieldText = [textField.text stringByReplacingCharactersInRange:range withString:string];
if ([textFieldText length] > 15)
{
return NO;
}
return YES;
}