+ (NSString *)machineModel
{
    static dispatch_once_t one;
    static NSString *model;
    dispatch_once(&one, ^{
        size_t size;
        sysctlbyname("hw.machine", NULL, &size, NULL, 0);
        char *machine = malloc(size);
        sysctlbyname("hw.machine", machine, &size, NULL, 0);
        model = [NSString stringWithUTF8String:machine];
        free(machine);
    });
    return model;
}

+ (NSString *)machineModelName
{
    static dispatch_once_t one;
    static NSString *name;
    dispatch_once(&one, ^{
        NSString *model = [self machineModel];
        if (!model) return;
        NSDictionary *dic = @{
                              @"Watch1,1" : @"Apple Watch",
                              @"Watch1,2" : @"Apple Watch",
                              
                              @"iPod1,1" : @"iPod touch 1",
                              @"iPod2,1" : @"iPod touch 2",
                              @"iPod3,1" : @"iPod touch 3",
                              @"iPod4,1" : @"iPod touch 4",
                              @"iPod5,1" : @"iPod touch 5",
                              @"iPod7,1" : @"iPod touch 6",
                              
                              @"iPhone1,1" : @"iPhone 1G",
                              @"iPhone1,2" : @"iPhone 3G",
                              @"iPhone2,1" : @"iPhone 3GS",
                              @"iPhone3,1" : @"iPhone 4 (GSM)",
                              @"iPhone3,2" : @"iPhone 4",
                              @"iPhone3,3" : @"iPhone 4 (CDMA)",
                              @"iPhone4,1" : @"iPhone 4S",
                              @"iPhone5,1" : @"iPhone 5",
                              @"iPhone5,2" : @"iPhone 5",
                              @"iPhone5,3" : @"iPhone 5c",
                              @"iPhone5,4" : @"iPhone 5c",
                              @"iPhone6,1" : @"iPhone 5s",
                              @"iPhone6,2" : @"iPhone 5s",
                              @"iPhone7,1" : @"iPhone 6 Plus",
                              @"iPhone7,2" : @"iPhone 6",
                              @"iPhone8,1" : @"iPhone 6s",
                              @"iPhone8,2" : @"iPhone 6s Plus",
                              
                              @"iPad1,1" : @"iPad 1",
                              @"iPad2,1" : @"iPad 2 (WiFi)",
                              @"iPad2,2" : @"iPad 2 (GSM)",
                              @"iPad2,3" : @"iPad 2 (CDMA)",
                              @"iPad2,4" : @"iPad 2",
                              @"iPad2,5" : @"iPad mini 1",
                              @"iPad2,6" : @"iPad mini 1",
                              @"iPad2,7" : @"iPad mini 1",
                              @"iPad3,1" : @"iPad 3 (WiFi)",
                              @"iPad3,2" : @"iPad 3 (4G)",
                              @"iPad3,3" : @"iPad 3 (4G)",
                              @"iPad3,4" : @"iPad 4",
                              @"iPad3,5" : @"iPad 4",
                              @"iPad3,6" : @"iPad 4",
                              @"iPad4,1" : @"iPad Air",
                              @"iPad4,2" : @"iPad Air",
                              @"iPad4,3" : @"iPad Air",
                              @"iPad4,4" : @"iPad mini 2",
                              @"iPad4,5" : @"iPad mini 2",
                              @"iPad4,6" : @"iPad mini 2",
                              @"iPad4,7" : @"iPad mini 3",
                              @"iPad4,8" : @"iPad mini 3",
                              @"iPad4,9" : @"iPad mini 3",
                              @"iPad5,1" : @"iPad mini 4",
                              @"iPad5,2" : @"iPad mini 4",
                              @"iPad5,3" : @"iPad Air 2",
                              @"iPad5,4" : @"iPad Air 2",
                              
                              @"i386" : @"Simulator x86",
                              @"x86_64" : @"Simulator x64",
                              };
        name = dic[model];
        if (!name) name = model;
    });
    return name;
}