作者：creantan 小葡萄爸爸

1、hook sysctlbyname底层函数,此种方法比较通用、可以修改任意App的设备信息的显示
实现代码如下：

int (*orig_sysctlbyname)(const char *name, void *oldp, size_t *oldlenp, void *newp, size_t newlen);

int mysysctlbyname(const char *name, void *oldp, size_t *oldlenp, void *newp, size_t newlen){
    if (strcmp(name,"hw.machine") == 0) {
        if (oldp != NULL) {
            int ret = orig_sysctlbyname(name,oldp,oldlenp,newp,newlen);
            const char* mechine = "iWatch Edition";
            strncpy((char *)oldp,mechine,strlen(mechine));
            return ret;
        }else{
            int ret = orig_sysctlbyname(name,oldp,oldlenp,newp,newlen);
            return ret;
        }
    }else{
        return orig_sysctlbyname(name,oldp,oldlenp,newp,newlen);
    }
}
%ctor {
    MSHookFunction((void *)MSFindSymbol(NULL,"_sysctlbyname"), (void *)mysysctlbyname, (void **)&orig_sysctlbyname);
}

2.NSUserDefaults值修改，只试用于QQ

cycript -p QQ_PID #使用cycript工具

[[NSUserDefaults standardUserDefaults]  setObject:@"iWatch Edition" forKey:@"_QQ号_strDeviceName"]