How to Check Null or Empty in given String

+ (BOOL)isNullOrEmpty:(NSString *)string

{

    if (string == nil)  {

        return YES;

    }

    if ((![string isKindOfClass:[NSNumber class]]) && (![string isKindOfClass:[NSString class]]) && (![string isKindOfClass:[NSDictionary class]]) && (![string isKindOfClass:[NSArray class]])) {

        return YES;

    }

   

    if (([string isKindOfClass:[NSString class]]) && ([string isEqualToString:@""])){

        return YES;

    }

   

    return NO;

}