An iOS library that will provide basic email syntax validation as well as provide suggestions for possible typos (for example, test@gamil.con would be corrected to test@gmail.com).
  
The SHEmailValidationTextField class is a pre-built UITextField subclass that will automatically validate its own input when it loses focus (such as when the user goes from the email field to the password field). If a syntax error is detected, a popup will appear informing the user that the email address they entered is invalid. If a probably typo is detected, a popup will appear that allows the user to accept the suggestion or dismiss the popup. Using this class is as simple as replacing instances of UITextField with SHEmailValidationTextField.
To customize the default error message that appear for validation errors, use the setDefaultErrorMessage: method. To set specific messages for specific errors, use the setMessage:forErrorCode: method. To customize the text that appears above a typo suggestion, use the setMessageForSuggestion: method.
To customize the look and feel of the popup window that appears, the fillColor, titleColor, and suggestionColor properties can be set as desired.
NSError *error = nil;
[[[SHEmailValidator] validator] validateSyntaxOfEmailAddress:emailAddress withError:&error];
if (error) {
// An error occurred
switch (error.code) {
case SHBlankAddressError:
// Input was empty
break;
case SHInvalidSyntaxError:
// Syntax completely wrong (probably missing @ or .)
break;
case SHInvalidUsernameError:
// Local portion of the email address is empty or contains invalid characters
break;
case SHInvalidDomainError:
// Domain portion of the email address is empty or contains invalid characters
break;
case SHInvalidTLDError:
// TLD portion of the email address is empty, contains invalid characters, or is under 2 characters long
break;
}
} else {
// Basic email syntax is correct
}
NSError *error = nil;
NSString *suggestion = [[[SHEmailValidator] validator] autocorrectSuggestionForEmailAddress:emailAddress withError:&error];
if (error) {
// The syntax check failed, so no suggestions could be generated
} else if (suggestion) {
// A probable typo has been detected and the suggestion variable holds the suggested correction
} else {
// No typo was found, or no suggestions could be generated
}
SHEmailValidator uses ARC. If your project is not ARC-compliant, simply set the -fobjc-arc flag on all SHEmailValidator source files.
This library is used in our own SpotHero app. If you would like to see your app listed here as well, let us know you're using it!
SHEmailValidator is released under the Apache 2.0 license.