我猜他们是不同的编码.

I guess that they are of different encoding.

我运行了这个实验，看到如果编码不同，它会返回NO.因此，尝试使用以下代码将 parseGrillId 转换为 utf8.

I have run this experiment and see that if the encoding is different, it will return NO. So, try converting parseGrillId to utf8 with the code below.

NSString *s1 = [NSString stringWithCString:"HELLO123" encoding:NSUTF8StringEncoding];
NSString *s2 = [NSString stringWithCString:"HELLO123" encoding:NSUTF16StringEncoding];
NSString *s3 = [NSString stringWithUTF8String:s2.UTF8String];

if ([s1 isEqualToString:s2]) {
    NSLog(@"s1 == s2");
}

if ([s1 isEqualToString:s3]) {
    NSLog(@"s1 == s3");
}

将打印s1 == s3.