Function for Password validation

int length=[passwordString length];        

 if( length<8 || length >10 || (![self isPasswordValid:passwordString])) {

            

    NSString *alertMsg=@"Password length should be between 8 to 10  
       characters.Password must have at least 1 alphabet and 1 numeral(0-9)";

     
   [AlertView showAlert:alertMsg WithDelegate:self andTag:555];

   textField.text=@"";

            

 }

-(BOOL) isPasswordValid:(NSString *)pwd {

    

    NSRange rang;

    isValid=YES;

    rang = [pwd rangeOfCharacterFromSet:[NSCharacterSet letterCharacterSet]];

    if ( !rang.length ){

        isValid=NO;// no letter        

    }    

    rang = [pwd rangeOfCharacterFromSet:[NSCharacterSet decimalDigitCharacterSet]];

    if ( !rang.length ) {

     isValid=NO;  // no numb

    }

    return isValid;

}