iOS8までは、WiFiホットスポットなどのWifiネットワークを検出するために、 SystemConfiguration.CaptiveNetwork で提供されている CNCopySupportedInterfaces と CNCopyCurrentNetworkInfo というメソッドを利用できました。 CaptiveNetwork Reference iOS9では Deprecated 扱いになっています。 @available(iOS, introduced=4.1, deprecated=9.0, message="For captive network applications, this has been completely replaced by <NetworkExtension/NEHotspotHelper.h>. For other applications,
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