간단하게 현재 네트워크 연결 상태를 가져오는 코드이다.

import UIKit
import SystemConfiguration

class ViewController: UIViewController {

    @IBOutlet weak var btnCheck: UIButton!
    @IBOutlet weak var lblResult: UILabel!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.
    }

    @IBAction func btnCheckTapped(_ sender: UIButton) {
        lblResult.text = isNetworkAvailable() ? "네트워크 연결" : "네트워크 미연결"
    }
    
    /// 네트워크 연결 체크
    /// - Returns: 연결 여부
    func isNetworkAvailable() -> Bool {
        var zeroAddress = sockaddr_in()
        zeroAddress.sin_len = UInt8(MemoryLayout.size(ofValue: zeroAddress))
        zeroAddress.sin_family = sa_family_t(AF_INET)
        
        let defaultRouteReachability = withUnsafePointer(to: &zeroAddress) {
            $0.withMemoryRebound(to: sockaddr.self, capacity: 1) { zeroSockAddress in
                SCNetworkReachabilityCreateWithAddress(nil, zeroSockAddress)
            }
        }

        var flags = SCNetworkReachabilityFlags()
        if !SCNetworkReachabilityGetFlags(defaultRouteReachability!, &flags) {
            return false
        }
        
        return (flags.rawValue & UInt32(kSCNetworkFlagsReachable)) == 2
    }
}

스크린 샷

샘플 소스 다운로드

Sample Source Download (NetworkCheck.zip)