- (IBAction)saveEmailAction:(id)sender {   
         if ([self  isValidateEmail:_mailField.text])   
         {   
             [self.delegate saveEmail:_mailField.text];   
             [self.navigationController popViewControllerAnimated:YES];   
         }   
        else   
        {   
            UIAlertView *error=[[UIAlertView alloc]initWithTitle:@"提示" message:@"请输入正确邮箱" delegate:self cancelButtonTitle:@"确定" otherButtonTitles:nil];   
            [error show];   
        }   
    }   
       
       
    -(BOOL)isValidateEmail:(NSString *)email {   
        NSString *emailRegex = @"[A-Z0-9a-z._%+-][email protected][A-Za-z0-9.-]+\\.[A-Za-z]{2,4}";   
        NSPredicate *emailTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", emailRegex];   
        return [emailTest evaluateWithObject:email];   
    }  

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UIWebView自适应内容的高度详解
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