isJailbroken

struct Security {
    static func isJailbroken() -> Bool {
        
        guard let cydiaUrlScheme = NSURL(string: "cydia://package/com.example.package") else { return false }
        if UIApplication.shared.canOpenURL(cydiaUrlScheme as URL) {
            return true
        }
        
        #if arch(i386) || arch(x86_64)
        // This is a Simulator not an idevice
        return false
        #endif
        
        for path in ["/Applications/Cydia.app",
                     "/Library/MobileSubstrate/MobileSubstrate.dylib",
                     "/bin/bash",
                     "/usr/sbin/sshd",
                     "/etc/apt",
                     "/usr/bin/ssh",
                     "/private/var/lib/apt"] {
                        if FileManager.default.fileExists(atPath: path) {
                            return true
                        }
                        if canOpen(path: path) {
                            return true
                        }
        }
        
        let path = "/private/" + NSUUID().uuidString
        do {
            try "anyString".write(toFile: path, atomically: true, encoding: String.Encoding.utf8)
            try fileManager.removeItem(atPath: path)
            return true
        } catch {
            return false
        }
    }
    
    private static func canOpen(path: String) -> Bool {
        let file = fopen(path, "r")
        guard file != nil else { return false }
        fclose(file)
        return true
    }
}