Email Address Validation in IOS 7

Question

I have contact form in my application in that i need to validate the email id i have found some solution for validating the email id but when used the validation method its showing warning.

@synthesize mail;

email validation code:

-(BOOL) Emailvalidate:(NSString *)mail
{
    BOOL stricterFilter = YES;
    NSString *stricterFilterString = @"[A-Z0-9a-z\\._%+-]+@([A-Za-z0-9-]+\\.)+[A-Za-z]{2,4}";
    NSString *laxString = @".+@([A-Za-z0-9]+\\.)+[A-Za-z]{2}[A-Za-z]*";
    NSString *emailRegex = stricterFilter ? stricterFilterString : laxString;
    NSPredicate *emailTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", emailRegex];
    return [emailTest evaluateWithObject:mail];
}

In the return its showing the warning like

Local declaration of mail hides instance variable.

I am sending all the date's to my server using the JSON please tell me how to resolve this one.

The problem is you have an local variable (declared in your object) with the same name as the variable declared in your method, try to change (NSString *)mail to (NSString *)tempMail — ReeCube, Mar 12 '14 at 07:31
@ReeCube i have changed the name now how to connect this validation to mail string — user3349668, Mar 12 '14 at 08:41
This is because of you have declare the same variable name in global scope. — Vineesh TP, Nov 13 '14 at 11:06

score 4 · Answer 1 · edited Aug 10 '16 at 22:24

4

The problem is you have an local variable (declared in your object with @syntensize) with the same name as the variable declared in your method, try this:

-(BOOL) validateEmail:(NSString *)tempMail
 {
     BOOL stricterFilter = YES;
     NSString *stricterFilterString = @"[A-Z0-9a-z\\._%+-]+@([A-Za-z0-9-]+\\.)+[A-Za-z]{2,4}";
     NSString *laxString = @".+@([A-Za-z0-9]+\\.)+[A-Za-z]{2}[A-Za-z]*";
     NSString *emailRegex = stricterFilter ? stricterFilterString : laxString;
     NSPredicate *emailTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", emailRegex];
     return [emailTest evaluateWithObject:tempMail];
 }

edited Aug 10 '16 at 22:24

Jamie Chapman

4,229
5
29
47

answered Mar 12 '14 at 07:32

ReeCube

2,545
17
23

how to connect my mail uitextfield and the validation pls tell me – user3349668 Mar 12 '14 at 08:44
Add an change event and then each time the content changes, you have to check it, more about the change event: http://stackoverflow.com/questions/7010547/uitextfield-text-change-event – ReeCube Mar 12 '14 at 08:45

score 1 · Answer 2 · answered Mar 12 '14 at 07:31

1

Well, your Emailvalidate method takes the parameter named 'mail', and your class already has a field named 'mail' as well... Just change the 'mail' parameter to something like 'newMail'..

answered Mar 12 '14 at 07:31

cania

857
10
16

score 1 · Answer 3 · edited Nov 27 '15 at 09:31

- (BOOL)validateEmailWithString:(NSString*)checkString {
    BOOL stricterFilter = NO;
    NSString *stricterFilterString = @"[A-Z0-9a-z\\._%+-]+@([A-Za-z0-9-]+\\.)+[A-Za-z]{2,4}";
    NSString *laxString = @".+@([A-Za-z0-9-]+\\.)+[A-Za-z]{2}[A-Za-z]*";
    NSString *emailRegex = stricterFilter ? stricterFilterString : laxString;
    NSPredicate *emailTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", emailRegex];
    return [emailTest evaluateWithObject:checkString];
}

Inertiatic · Answer 4 · 2014-03-12T07:45:43.613

In addition to what cania already said, this would make a good class method instead of an instance method. I would make it a class method so that any of your classes can call it easily if you ever need to validate another e-mail.

Then a call would look like this and return true if a valid e-mail, assuming your mail property is a NSString.

if ([YourClassName Emailvalidate:self.mail]) {
      // valid e-mail, do what you want to do 
} 
else {
      // handle getting an invalid e-mail here 
}

Email Address Validation in IOS 7

4 Answers4