iOS 获取wifi ssid 名称

SSID全称Service Set IDentifier, 即Wifi网络的公开名称.在IOS 4.1以上版本提供了公开的方法来获取该信息.

 #import <SystemConfiguration/CaptiveNetwork.h>

 -(id)fetchSSIDInfo
 {
     NSArray *ifs = (id)CNCopySupportedInterfaces();
     NSLog(@"%s: Supported interfaces: %@", __func__, ifs);
     id info = nil;
     for (NSString *ifnam in ifs) {
         info = (id)CNCopyCurrentNetworkInfo((CFStringRef)ifnam);
         if (info && [info count]) {
             break;
         }
         [info release];
     }
     [ifs release];
     return [info autorelease];
 }

 - (NSString *)currentWifiSSID {
     // Does not work on the simulator.
     NSString *ssid = nil;
     NSArray *ifs = (  id)CNCopySupportedInterfaces();
     NSLog(@"ifs:%@",ifs);
     for (NSString *ifnam in ifs) {
         NSDictionary *info = (id)CNCopyCurrentNetworkInfo((CFStringRef)ifnam);
         NSLog(@"dici：%@",[info  allKeys]);
         if (info[@"SSIDD"]) {
             ssid = info[@"SSID"];

         }
     }
     return ssid;
 }

 - (void)viewDidLoad
 {
     [super viewDidLoad];

     tempLabel=[[UILabel alloc]initWithFrame:CGRectMake(50, 40, 200, 40)];
     tempLabel.textAlignment=NSTextAlignmentCenter;
     [self.view addSubview:tempLabel];
     NSDictionary *ifs = [self fetchSSIDInfo];
     NSString *ssid = [[ifs objectForKey:@"SSID"] lowercaseString];
     tempLabel.text=ssid;

 }

log 信息 ：

 2013-06-05 21:39:14.357 wifiNameDemo[9877:707] dici：{
     BSSID = "f4:ec:38:40:cc:e8";
     SSID = "Nice_Apple";
     SSIDDATA = <4e696365 5f417070 6c65>;
 }
 2013-06-05 21:39:14.360 wifiNameDemo[9877:707] Nice_Apple

 ARC 版本：

 - (id)fetchSSIDInfo {
     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 info;
 }

  效果如下：