Check if iOS app is connected to proxy

is_connected_to_proxy.swift

func isConnectedToProxy() -> Bool {
    let host = "http://www.example.com"
    if let url = URL(string: host),
        let proxySettingsUnmanaged = CFNetworkCopySystemProxySettings() {
        let proxySettings = proxySettingsUnmanaged.takeRetainedValue()
        let proxyUnmanaged = CFNetworkCopyProxiesForURL(url as CFURL, proxySettings)
        if let proxies = proxyUnmanaged.takeRetainedValue() as? [[String : AnyObject]], proxies.count > 0 {
            let proxy = proxies[0]
            let key = kCFProxyTypeKey as String
            let value = kCFProxyTypeNone as String
            if let v = proxy[key] as? String, v != value {
                return true
            }
        }
    }
    return false
}