在app中有时会获取当前手机的IP地址（主要在wifi下），当然主要看产品的需求；在OC的状态下获取是相对简单的，但在Swift下（强类型）目前我只有一个临时的替代方案，如果谁有更好的，希望交流一下，非常感谢。
在OC中获取当前wifi的IP

    NSString *address = @"error";
    struct ifaddrs *interfaces = NULL;
    struct ifaddrs *temp_addr = NULL;
    int success = 0;
    success = getifaddrs(&interfaces);
    if (success == 0) {
        temp_addr = interfaces;
        while(temp_addr != NULL) {
            if(temp_addr->ifa_addr->sa_family == AF_INET) {
                if([[NSString stringWithUTF8String:temp_addr->ifa_name] isEqualToString:@"en0"]) {
                    address = [NSString stringWithUTF8String:inet_ntoa(((struct sockaddr_in *)temp_addr->ifa_addr)->sin_addr)];
                }
            }
            temp_addr = temp_addr->ifa_next;
        }
    }
    freeifaddrs(interfaces);

在Swift中获取当前wifi下的IP

        var addresses = "error"
        var ifaddr :  UnsafeMutablePointer<ifaddrs>? = nil
        var temp_addr :  UnsafeMutablePointer<ifaddrs>? = nil
        var success :Int = 0
        success = Int(getifaddrs(&ifaddr))
        if success == 0 {
            temp_addr = ifaddr
            while temp_addr != nil {
                if (Int32((temp_addr?.pointee.ifa_addr.pointee.sa_family)!) == AF_INET) {

                    if (String(cString: (temp_addr?.pointee.ifa_name)!, encoding: .utf8) == "en0") {

                        let fucn = ((temp_addr?.pointee.ifa_addr.pointee.sa_data)?.2)! < 0 ? -((temp_addr?.pointee.ifa_addr.pointee.sa_data)?.2)! : ((temp_addr?.pointee.ifa_addr.pointee.sa_data)?.2)
                        let fucn2 = ((temp_addr?.pointee.ifa_addr.pointee.sa_data)?.3)! < 0 ? -((temp_addr?.pointee.ifa_addr.pointee.sa_data)?.3)! : ((temp_addr?.pointee.ifa_addr.pointee.sa_data)?.3)
                        let foo : UInt8 = UInt8(Int8.max) - UInt8(fucn!) + UInt8(Int8.max) + 2
                        let foo1 : UInt8 = UInt8(Int8.max) - UInt8(fucn2!) + UInt8(Int8.max) + 2
                        let fucn3:UInt8  = UInt8(((temp_addr?.pointee.ifa_addr.pointee.sa_data)?.4)!)
                        let fucn4:UInt8  = UInt8(((temp_addr?.pointee.ifa_addr.pointee.sa_data)?.5)!)
                        let intString: String = "\(foo):\(foo1):\(fucn3):\(fucn4)"
                        print("intString=\(intString)")

                        addresses = intString
                    }
                    
                }

                temp_addr = temp_addr?.pointee.ifa_next
            }

            
        }