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Sign in validations in Objective V

- (BOOL)validatePhoneNumber:(NSString *)phoneStr {
    NSString *phoneRegex = @"[789][0-9]{9}";
    NSPredicate *test = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", phoneRegex];
    BOOL matches = [test evaluateWithObject:phoneStr];
    return matches;

- (BOOL)validateEmail:(NSString *)emailStr {
    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:emailStr];

// This method is use to Validate an URL
- (BOOL)isValidUrl
    NSString *regex =@"(http|https)://((\\w)*|([0-9]*)|([-|_])*)+([\\.|/]((\\w)*|([0-9]*)|([-|_])*))+";
    NSPredicate *urlTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",regex];
    return [urlTest evaluateWithObject:self];

// This method is use to Validate an Name
- (BOOL)isValidName
    NSCharacterSet * chars = [NSCharacterSetcharacterSetWithCharactersInString:@"ABCDEFGHIJKLKMNOPQRSTUVWXYZ abcdefghijklmnopqrstuvwxyz"];
    NSCharacterSet * characterSetFromTextField = [NSCharacterSetcharacterSetWithCharactersInString:self];
    return [chars isSupersetOfSet:characterSetFromTextField];

// This method is use to check if a particular string contains only letters. 
- (BOOL)containsOnlyLetters
    NSCharacterSet *letterCharacterset = [[NSCharacterSet letterCharacterSet]invertedSet];
    return ([self rangeOfCharacterFromSet:letterCharacterset].location == NSNotFound);

// This method is use to check if a particular string contains only numbers. 
- (BOOL)containsOnlyNumbers
    NSCharacterSet *numbersCharacterSet = [[NSCharacterSetcharacterSetWithCharactersInString:@"0123456789"] invertedSet];
    return ([self rangeOfCharacterFromSet:numbersCharacterSet].location == NSNotFound);

// This method is use to check if a particular string contains letters and numbers.
- (BOOL)containsOnlyNumbersAndLetters
    NSCharacterSet *numAndLetterCharSet = [[NSCharacterSet alphanumericCharacterSet]invertedSet];
    return ([self rangeOfCharacterFromSet:numAndLetterCharSet].location == NSNotFound);


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