iOS oc 检测手机移动网络和wifi是否开启
利用Reachability的的一个方法currentReachabilityStatus 获取枚举类型值判断是否为2即可，不是2就不是WiFi。enum {
// DDG NetworkStatus Constant Names.
kNotReachable = 0, // Apple's code depends upon 'NotReachable' being the same value as 'NO'.
kReachableViaWWAN, // Switched order from Apple's enum. WWAN is active before WiFi.
kReachableViaWiFi
};
typedef uint32_t NetworkStatus;
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