【Swift3】アプリの設定画面に遷移する

UIApplicationOpenSettingsURLString を使えばよい。

func goToAppSetting () {
    guard let settingsUrl = URL(string: UIApplicationOpenSettingsURLString) else {
        return
    }
    if UIApplication.shared.canOpenURL(settingsUrl) {
        UIApplication.shared.open(settingsUrl)
    }
}