如何在 iOS 或 macOS 上檢查活動的互聯網連接？ - How to check for an active Internet connection on iOS or macOS?

問題：

I would like to check to see if I have an Internet connection on iOS using the Cocoa Touch libraries or on macOS using the Cocoa libraries.我想檢查一下我是否在使用Cocoa Touch庫的 iOS 或使用Cocoa庫的 macOS 上有互聯網連接。

I came up with a way to do this using an NSURL .我想出了一種使用NSURL來做到這一點的方法。 The way I did it seems a bit unreliable (because even Google could one day be down and relying on a third party seems bad), and while I could check to see for a response from some other websites if Google didn't respond, it does seem wasteful and an unnecessary overhead on my application.我這樣做的方式似乎有點不可靠（因爲即使有一天谷歌可能會宕機並且依賴第三方似乎很糟糕），雖然如果谷歌沒有迴應，我可以查看其他一些網站的迴應，它對我的應用程序來說似乎是浪費和不必要的開銷。

- (BOOL) connectedToInternet
{
    NSString *URLString = [NSString stringWithContentsOfURL:[NSURL URLWithString:@"http://www.google.com"]];
    return ( URLString != NULL ) ? YES : NO;
}

Is what I have done bad, (not to mention stringWithContentsOfURL is deprecated in iOS 3.0 and macOS 10.4) and if so, what is a better way to accomplish this?我做的不好（更不用說stringWithContentsOfURL在 iOS 3.0 和 macOS 10.4 中已棄用），如果是這樣，有什麼更好的方法來實現這一點？

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解決方案：

參考一： https://stackoom.com/question/4Xv3
參考二： How to check for an active Internet connection on iOS or macOS?