找资料的时候看到别人写的，记录下，有空自己研究下
　iOS下Wi-Fi开发需要添加依赖库SystemConfiguration.framework，在需要使用Wi-Fi信息的控制器下引入头文件#import <SystemConfiguration/CaptiveNetwork.h>
1，Wi-Fi热点获取
+(NSString *) currentWifiSSID
{

if TARGET_OS_SIMULATOR

return @"(simulator)";

else

NSArray *ifs = (__bridge id)CNCopySupportedInterfaces();

id info = nil;
for (NSString *ifnam in ifs) {
    info = (__bridge id)CNCopyCurrentNetworkInfo((__bridge CFStringRef)ifnam);
    if (info && [info count]) {
        break;
    }
}
NSDictionary *dctySSID = (NSDictionary *)info;
NSString *ssid = [dctySSID objectForKey:@"SSID"] ;

return ssid;

endif

}
2，取得本机Wi-Fi的IP地址

include <arpa/inet.h>

include <netdb.h>

include <net/if.h>

include <ifaddrs.h>

import <dlfcn.h>

+(NSString *) localWiFiIPAddress
{
BOOL success;
struct ifaddrs * addrs;
const struct ifaddrs * cursor;

success = getifaddrs(&addrs) == 0;
if (success) {
    cursor = addrs;
    while (cursor != NULL) {
        // the second test keeps from picking up the loopback address
        if (cursor->ifa_addr->sa_family == AF_INET && (cursor->ifa_flags & IFF_LOOPBACK) == 0)
        {
            NSString *name = [NSString stringWithUTF8String:cursor->ifa_name];
            if ([name isEqualToString:@"en0"])  // Wi-Fi adapter
                return [NSString stringWithUTF8String:inet_ntoa(((struct sockaddr_in *)cursor->ifa_addr)->sin_addr)];
        }
        cursor = cursor->ifa_next;
    }
    freeifaddrs(addrs);
}
return nil;

}
3，获取当前Wi-Fi的名称

• (void)GetWifiName{

NSString *wifiName = @"Not Found";

CFArrayRef myArray = CNCopySupportedInterfaces();

if (myArray != nil) {

CFDictionaryRef myDict =CNCopyCurrentNetworkInfo(CFArrayGetValueAtIndex(myArray, 0));

if (myDict != nil) {

NSDictionary dict = (NSDictionary)CFBridgingRelease(myDict);

wifiName = [dict valueForKey:@"SSID"];

}

NSLog(@"wifiName:%@", wifiName);

}
　注意：需要真机才能测试！模拟器下返回空。

4，打开系统设置

从应用跳到系统设置里的WiFi界面有这个需求存在吗？答案是肯定的。

在没有网的状态下，你可能想提醒用户去设置界面连接WiFi。如果不能跳到WiFi界面，只能在APP里面做出文字提示。这样很多小白用户可能不会看提示，只会觉得APP没有做好。
+(void)openSystemSetting:(NSString *)settingName{
//iOS8 才有效
float version = [[[UIDevice currentDevice] systemVersion] floatValue];

if __IPHONE_OS_VERSION_MAX_ALLOWED < __IPHONE_8_0

define SETTING_URL @"app-settings:"

else

define SETTING_URL UIApplicationOpenSettingsURLString

endif

//  NSLog(UIApplicationOpenSettingsURLString);
if (version >= 8.0){
    [[UIApplication sharedApplication] openURL:
     [NSURL URLWithString:SETTING_URL]];
}

}
UIApplication.sharedApplication().openURL(NSURL(string: "prefs:root=WIFI")!)
原文链接地址：http://www.cnblogs.com/xjf125/p/5360550.html