iOS 检测Wifi是否打开、IP地址、Wifi名称

代码主要是造轮子的，没有什么需要讲解的，主要方便以后查询。

1. 引入需要的头文件

#import <ifaddrs.h>
#import <arpa/inet.h>
#import <SystemConfiguration/CaptiveNetwork.h>
#import <net/if.h>

2. 检测WIFI功能是否打开

+(BOOL) isWiFiOpened
{
    NSCountedSet * cset = [NSCountedSet new];
    struct ifaddrs *interfaces;
    if( ! getifaddrs(&interfaces) )
    {
        for( struct ifaddrs *interface = interfaces; interface; interface = interface->ifa_next)
        {
            if ( (interface->ifa_flags & IFF_UP) == IFF_UP )
            {
                [cset addObject:[NSString stringWithUTF8String:interface->ifa_name]];
            }
        }
    }
    return [cset countForObject:@"awdl0"] > 1 ? YES : NO;
}

3. 获取当前IP地址

+(nullable NSString*)getCurrentWifiIP
{
    NSString *address = nil;
    struct ifaddrs *interfaces = NULL;
    struct ifaddrs *temp_addr = NULL;
    int success = 0;
    // retrieve the current interfaces - returns 0 on success
    success = getifaddrs(&interfaces);
    if (success == 0) {
        // Loop through linked list of interfaces
        temp_addr = interfaces;
        while(temp_addr != NULL) {
            if(temp_addr->ifa_addr->sa_family == AF_INET) {
                // Check if interface is en0 which is the wifi connection on the iPhone
                if([[NSString stringWithUTF8String:temp_addr->ifa_name] isEqualToString:@"en0"]) {
                    // Get NSString from C String
                    address = [NSString stringWithUTF8String:inet_ntoa(((struct sockaddr_in *)temp_addr->ifa_addr)->sin_addr)];
                }
            }
            temp_addr = temp_addr->ifa_next;
        }
    }
    // Free memory
    freeifaddrs(interfaces);
    return address;
}

4. 获取WIFI名称

+(nullable NSString *)getCurretWiFiSsid
{
    NSArray *ifs = (__bridge_transfer id)CNCopySupportedInterfaces();
    NSLog(@"Supported interfaces: %@", ifs);
    id info = nil;
    for (NSString *ifnam in ifs)
    {
        info = (__bridge_transfer id)CNCopyCurrentNetworkInfo((__bridge CFStringRef)ifnam);
        NSLog(@"%@ => %@", ifnam, info);
        if (info && [info count]) { break; }
    }
    return [(NSDictionary*)info objectForKey:@"SSID"];
}

惯例代码上传到gitHub。