Email validation on textField in iOS

Question

In iOS App, how to add Email validation on UITextField?

Answer 1

NSRegularExpression is the Best Way to Validate Email Addresses with iOS 4.x and Later.

-(BOOL) validateEmail:(NSString*) emailString 
{
     NSString *regExPattern = @"^[A-Z0-9._%+-]+@[A-Z0-9.-]+\\.[A-Z]{2,4}$";
     NSRegularExpression *regEx = [[NSRegularExpression alloc] initWithPattern:regExPattern options:NSRegularExpressionCaseInsensitive error:nil];
     NSUInteger regExMatches = [regEx numberOfMatchesInString:emailString options:0 range:NSMakeRange(0, [emailString length])];
     NSLog(@"%i", regExMatches);
     if (regExMatches == 0) {
         return NO;
     } 
     else
         return YES;
}

Usage :

if([self validateEmail:@"something@domain.com"]) {
  //Email Address is valid.
} 
else {
  //Email Address is invalid.
}