是否越狱

static const char* jailbreak_apps[] =
{
    "/Applications/Cydia.app",
    "/Applications/limera1n.app",
    "/Applications/greenpois0n.app",
    "/Applications/blackra1n.app",
    "/Applications/blacksn0w.app",
    "/Applications/redsn0w.app",
    NULL,
};

+ (BOOL) isJailBroken
{
    // Now check for known jailbreak apps. If we encounter one, the device is jailbroken.
    for (int i = 0; jailbreak_apps[i] != NULL; ++i)
    {
        if ([[NSFileManager defaultManager] fileExistsAtPath:[NSString stringWithUTF8String:jailbreak_apps[i]]])
        {
            //NSLog(@"isjailbroken: %s", jailbreak_apps[i]);
            return YES;
        }        
    }
    
    // TODO: Add more checks? This is an arms-race we're bound to lose.
    
    return NO;
}