Question

现在我想实现检测网络从开始到应用程序将检测是否链接网络，假设用户在途中切断网络，屏幕将显示标签和imageView，如果网络重新连接，你可以自动显示信息，让标签和imageView消失，但现在我不知道如何自动检测网络，标签和imageView如何把屏幕的中心（不使用故事板），谢谢！

这是我的代码：

func laodingTableviewData() {
    self.tableView.isHidden = true
    let activityIndicatorView = NVActivityIndicatorView(frame:CGRect(x:ActivityConstraint.Activity.offsetX, y:ActivityConstraint.Activity.offsetY , width:80.0, height:80.0), type: .ballSpinFadeLoader, color: ActivityConstraint.Activity.color, padding: 20)

    self.view.addSubview(activityIndicatorView)
    activityIndicatorView.startAnimating()
    //detect network
    guard  Reachability.isConnectedToNetwork() == true else {
        DispatchQueue.main.asyncAfter(deadline: DispatchTime.now() + 1.5) {
            self.failNetworkAlert()
            self.failNetworkOutlet()
            activityIndicatorView.stopAnimating()
        }


        return
    }
    DispatchQueue.main.asyncAfter(deadline: DispatchTime.now() + 1.5) {
        self.bulletinBoards = BulletinBoard.downloadAllBulletinBoard()
        self.tableView.isHidden = false
        self.tableView.reloadData()
        activityIndicatorView.stopAnimating()
    }

}

创建标签和图像视图：

func failNetworkOutlet() {
    let w = self.view.frame.width/2
    let h = self.view.frame.height/2
    let label = UILabel(frame: CGRect(x: -30, y: 0, width: 250, height: 21))
    label.center = CGPoint(x: w+5, y: h)
    label.textAlignment = .center
    label.text = "Please confirm that you are connected to the web"
    label.font = label.font.withSize(20)
    label.tintColor = UIColor.gray


    let imageViewObject = UIImageView(frame:CGRect(x: w-25, y: h-85, width: 60, height: 60))
    imageViewObject.image = UIImage(named:"ic_settings_input_antenna_48pt")?.withRenderingMode(.alwaysTemplate)
    imageViewObject.tintColor = UIColor.gray

    self.view.addSubview(imageViewObject)
    self.view.addSubview(label)
}

Answer 1

您可以检查可达性的网络通知。然后发布一些通知，以便我们知道网络状态

 import UIKit
import ReachabilitySwift

class ViewController: UIViewController {

let reachability = Reachability()

override func viewDidLoad() {
    super.viewDidLoad()
    checkNetworkStatus()
}


fileprivate func checkNetworkStatus() {

    if let reachability = reachability {
        reachability.whenReachable = { [unowned self] reachable in
            self.postNetworkStatusChangedNotification(to: true)
        }

        reachability.whenUnreachable = { [unowned self] unreachable in
            self.postNetworkStatusChangedNotification(to: false)
        }

        //start the notifier
        do {
            try reachability.startNotifier()
        }
        catch {
            print("Unable to start the network notifier")
        }
    }
}

func postNetworkStatusChangedNotification(to acquired:Bool) {
    //we will post notification
    if acquired {
        print("\n=== Internet Acess Acquired ===\n")
    }
    else {

        print("\n=== Lost Internet Access ===\n")
    }
}

}

启动时，只要网络状态发生变化，它就会通知。

自动重新连接到互联网并消失标签

1 个答案: