建立 Reachability 偵聽器
Apple 的 Reachability 類定期檢查網路狀態並提醒觀察者更改。
Reachability *internetReachability = [Reachability reachabilityForInternetConnection];
[internetReachability startNotifier];
Apple 的 Reachability 類定期檢查網路狀態並提醒觀察者更改。
Reachability *internetReachability = [Reachability reachabilityForInternetConnection];
[internetReachability startNotifier];