下面给出两种不同的方法验证邮箱输入合法性

//通过区分字符串

-(BOOL)validateEmail:(NSString*)email

{

if((0 != [email rangeOfString:@"@"].length) &&

(0 != [email rangeOfString:@"."].length))

{

NSCharacterSet* tmpInvalidCharSet = [[NSCharacterSet alphanumericCharacterSet] invertedSet];

NSMutableCharacterSet* tmpInvalidMutableCharSet = [[tmpInvalidCharSet mutableCopy] autorelease];

[tmpInvalidMutableCharSet removeCharactersInString:@"_-"];

/*
*使用compare option 来设定比较规则，如

*NSCaseInsensitiveSearch是不区分大小写

*NSLiteralSearch 进行完全比较,区分大小写

*NSNumericSearch 只比较定符串的个数，而不比较字符串的字面值
*/

NSRange range1 = [email rangeOfString:@"@" options:NSCaseInsensitiveSearch];

//取得用户名部分

NSString* userNameString = [email substringToIndex:range1.location];

NSArray* userNameArray = [userNameString componentsSeparatedByString:@"."];

for(NSString* string in userNameArray)

{

NSRange rangeOfInavlidChars = [string rangeOfCharacterFromSet: tmpInvalidMutableCharSet];

if(rangeOfInavlidChars.length != 0 || [string isEqualToString:@""])

return NO;

}

//取得域名部分

NSString *domainString = [email substringFromIndex:range1.location+1];

NSArray *domainArray = [domainString componentsSeparatedByString:@"."];

for(NSString *string in domainArray)

{

NSRange rangeOfInavlidChars=[string rangeOfCharacterFromSet:tmpInvalidMutableCharSet];

if(rangeOfInavlidChars.length !=0 || [string isEqualToString:@""])

return NO;

}

return YES;

}

else {

return NO;

}

}

//利用正则表达式验证

-(BOOL)isValidateEmail:(NSString *)email {

NSString *emailRegex = @"[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,4}";

NSPredicate *emailTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",emailRegex];

return [emailTest evaluateWithObject:email];

}