swift 获取手机SSID和BSSID以及IP地址

获取手机SSID和BSSID可以使用iOS的System Configuration框架中的Captive Network API，具体代码如下：

import SystemConfiguration.CaptiveNetwork

func getWifiInfo() -> (ssid: String?, bssid: String?) {
    var ssid: String?
    var bssid: String?
    if let interfaces = CNCopySupportedInterfaces() as NSArray? {
        for interface in interfaces {
            if let interfaceInfo = CNCopyCurrentNetworkInfo(interface as! CFString) as NSDictionary? {
                ssid = interfaceInfo[kCNNetworkInfoKeySSID as String] as? String
                bssid = interfaceInfo[kCNNetworkInfoKeyBSSID as String] as? String
            }
        }
    }
    return (ssid, bssid)
}

获取IP地址可以使用iOS的网络接口API，具体代码如下：

import UIKit
import SystemConfiguration

func getIPAddress() -> String? {
    var address: String?
    var ifaddr: UnsafeMutablePointer<ifaddrs>? = nil
    if getifaddrs(&ifaddr) == 0 {
        var ptr = ifaddr
        while ptr != nil {
            let flags = Int32(ptr!.pointee.ifa_flags)
            var addr = ptr!.pointee.ifa_addr.pointee
            if ((flags & (IFF_UP|IFF_RUNNING)) == (IFF_UP|IFF_RUNNING)) && (addr.sa_family == UInt8(AF_INET) || addr.sa_family == UInt8(AF_INET6)) {
                var hostname = [CChar](repeating: 0, count: Int(NI_MAXHOST))
                if (getnameinfo(&addr, socklen_t(addr.sa_len), &hostname, socklen_t(hostname.count), nil, socklen_t(0), NI_NUMERICHOST) == 0) {
                    if let addressString = String(validatingUTF8:hostname) {
                        if addr.sa_family == UInt8(AF_INET) {
                            address = addressString
                        }
                    }
                }
            }
            ptr = ptr!.pointee.ifa_next
        }
        freeifaddrs(ifaddr)
    }
    return address
}

注意，获取IP地址需要在应用的Info.plist文件中添加`Privacy - Local Network Usage Description`键，并在值中添加描述，否则应用将被拒绝。