OC- 获取当前设备WiFi信息

首先，获取设备WiFi信息，需要添加系统库 <SystemConfiguration/CaptiveNetwork.h> 文件，
然后，上代码：

NSDictionary *currentWifiInfo = nil;
// 获取当前的interface 数组
CFArrayRef currentInterfaces = CNCopySupportedInterfaces();

if (!currentInterfaces) {
return nil;
}

// 类型转换，将CF对象，转为NS对象，同时将该对象的引用计数交给 ARC 管理
NSArray *interfaces = (__bridge_transferNSArray *)currentInterfaces;

if (interfaces.count >0) {
for (NSString *interfaceNamein interfaces) {
// 转换类型，不改变引用计数
CFDictionaryRef dictRef = CNCopyCurrentNetworkInfo((__bridge CFStringRef)(interfaceName));
if (dictRef) {
NSDictionary *networkInfo = (__bridge_transferNSDictionary *)dictRef;
NSString *SSID = [networkInfo objectForKey:(__bridge_transfer NSString *)kCNNetworkInfoKeySSID];
NSString *BSSID = [networkInfoobjectForKey:(__bridge_transferNSString *)kCNNetworkInfoKeyBSSID];
NSData *SSIDDATA = [networkInfoobjectForKey:(__bridge_transferNSData *)kCNNetworkInfoKeySSIDData];

currentWifiInfo = @{@"SSID":SSID,
@"BSSID":BSSID,
@"SSIDDATA":SSIDDATA};

}
}
}

NSLog(@"currentWifiInfo = %@",currentWifiInfo);