iOS 中的一些常用函数

1.获取 本地语言

+ (NSString *)getLocalLanguage
{
    NSString *language = [[[NSUserDefaults standardUserDefaults] objectForKey:@"AppleLanguages"] objectAtIndex:0];
    return language;
}

2.获取mac 地址

// returns the local MAC address.
+ (NSString*) macAddress:(NSString*)interfaceNameOrNil
{
    // uses en0 as the default interface name
    NSString* interfaceName = interfaceNameOrNil;
    if (interfaceName == nil)
    {
        interfaceName = @"en0";
    }
    
    int                 mib[6];
    size_t              len;
    char                *buf;
    unsigned char       *ptr;
    struct if_msghdr    *ifm;
    struct sockaddr_dl  *sdl;
    
    mib[0] = CTL_NET;
    mib[1] = AF_ROUTE;
    mib[2] = 0;
    mib[3] = AF_LINK;
    mib[4] = NET_RT_IFLIST;
    
    if ((mib[5] = if_nametoindex([interfaceName UTF8String])) == 0)
    {
        printf("Error: if_nametoindex error
");
        return NULL;
    }
    
    if (sysctl(mib, 6, NULL, &len, NULL, 0) < 0)
    {
        printf("Error: sysctl, take 1
");
        return NULL;
    }
    
    if ((buf = malloc(len)) == NULL)
    {
        printf("Could not allocate memory. error!
");
        return NULL;
    }
    
    if (sysctl(mib, 6, buf, &len, NULL, 0) < 0)
    {
        printf("Error: sysctl, take 2");
        free(buf);
        return NULL;
    }
    
    ifm = (struct if_msghdr*) buf;
    sdl = (struct sockaddr_dl*) (ifm + 1);
    ptr = (unsigned char*) LLADDR(sdl);
    NSString *outstring = [NSString stringWithFormat:@"%02X:%02X:%02X:%02X:%02X:%02X",
                           *ptr, *(ptr+1), *(ptr+2), *(ptr+3), *(ptr+4), *(ptr+5)];
    free(buf);
    
    return outstring;
}

3.判断是否 越狱

static const char * __jb_app = NULL;

+ (BOOL)isJailBroken
{
    static const char * __jb_apps[] =
    {
        "/Application/Cydia.app", 
        "/Application/limera1n.app", 
        "/Application/greenpois0n.app", 
        "/Application/blackra1n.app",
        "/Application/blacksn0w.app",
        "/Application/redsn0w.app",
        NULL
    };

    __jb_app = NULL;

    // method 1
    for ( int i = 0; __jb_apps[i]; ++i )
    {
        if ( [[NSFileManager defaultManager] fileExistsAtPath:[NSString stringWithUTF8String:__jb_apps[i]]] )
        {
            __jb_app = __jb_apps[i];
            return YES;
        }
    }
    
    // method 2
    if ( [[NSFileManager defaultManager] fileExistsAtPath:@"/private/var/lib/apt/"] )
    {
        return YES;
    }
    
    // method 3
    if ( 0 == system("ls") )
    {
        return YES;
    }
    
    return NO;    
}

+ (NSString *)jailBreaker
{
    if ( __jb_app )
    {
        return [NSString stringWithUTF8String:__jb_app];
    }
    else
    {
        return @"";
    }
}