是否有(合法)方式捕获iOS下的整个屏幕？

#include <sys/socket.h>
#include <ifaddrs.h>
#include <net/if.h>

BOOL IsNICTurnedOn(const char *nicName) {
    BOOL result = NO;

    struct ifaddrs *addrs = NULL;
    if (0 == getifaddrs(&addrs)) {
        for (struct ifaddrs *addr = addrs; addr != NULL; addr = addr->ifa_next) {
            if (0 == strcmp(addr->ifa_name,nicName)) {
                result = (0 != (addr->ifa_flags & (IFF_UP | IFF_RUNNING)));
                break;
            }
        }
        freeifaddrs(addrs);
    }

    return result;
}

要使用此功能：

BOOL isWWANEnabled = IsNICTurnedOn("pdp_ip0");
BOOL isWiFiEnabled = IsNICTurnedOn("en0");