cocoa 查看无线是否打开 可链接的wifi列表 

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CWInterface *wifi = [CWWiFiClient sharedWiFiClient].interface;
 
NSLog(@"interfaceName: %@", wifi.interfaceName);
NSLog(@"ssid: %@", wifi.ssid);
NSLog(@"powerOn: %@", @(wifi.powerOn));
 
NSSet<CWNetwork *> *result = [wifi scanForNetworksWithName:nil error:nil];
NSLog(@"可连接的wifi列表");
for (CWNetwork *each in result) {
    NSLog(@"--->%@",each.ssid);
}