检查电子邮件地址在iOS上是否有效 [英] Check that an email address is valid on iOS

问题描述

可能重复：

在iOS 2.0上验证Objective-C中的电子邮件地址的最佳做法

我正在开发一个iPhone应用程序，我需要用户在登录时提供他的电子邮件地址。

检查电子邮件地址是否是有效的电子邮件地址的最佳方式是什么？

解决方案

好可可功能：

   - （BOOL）NSStringIsValidEmail：（NSString *）checkString 
 {
 BOOL stricterFilter = NO; //讨论http://blog.logichigh.com/2010/09/02/validating-an-e-mail-address/ 
 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]; 
} 
  

讨论Lax vs. Strict - http://blog.logichigh.com/2010/09/02/validating-an-e -mail-address /

由于类别更好，您还可以添加一个界面：

- （BOOL）isValidEmail; $ $ $ $ $ $
@end

实施

  @implementation NSString（emailValidation）
  - （BOOL）isValidEmail 
 {
 BOOL stricterFilter = NO; //讨论http://blog.logichigh.com/2010/09/02/validating-an-e-mail-address/ 
 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：self]; 
} 
 @end 
  

然后利用：

  if（[@[e-mail]]）{/ * True * /} 
 if（[@InvalidEmail @ notreallyemailbecausenosuffixisValidEmail]）{/ * False * /} 
  

Possible Duplicate:
Best practices for validating email address in Objective-C on iOS 2.0?

I am developing an iPhone application where I need the user to give his email address at login.

What is the best way to check if an email address is a valid email address?

解决方案

Good cocoa function:

-(BOOL) NSStringIsValidEmail:(NSString *)checkString
{
   BOOL stricterFilter = NO; // Discussion http://blog.logichigh.com/2010/09/02/validating-an-e-mail-address/
   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];
}

Discussion on Lax vs. Strict - http://blog.logichigh.com/2010/09/02/validating-an-e-mail-address/

And because categories are just better, you could also add an interface:

@interface NSString (emailValidation) 
  - (BOOL)isValidEmail;
@end

Implement

@implementation NSString (emailValidation)
-(BOOL)isValidEmail
{
  BOOL stricterFilter = NO; // Discussion http://blog.logichigh.com/2010/09/02/validating-an-e-mail-address/
  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:self];
}
@end

And then utilize:

if([@"[e-mail]" isValidEmail]) { /* True */ }
if([@"InvalidEmail@notreallyemailbecausenosuffix" isValidEmail]) { /* False */ }

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