Reconnect to the internet automatically and disappear label - ios

Question

Now I want to implement the detect network from the beginning into the app will detect whether the link network，assuming that the user cuts off the network on the way, the screen will display a label and imageView, if the network is reconnected, you can automatically display the information and let label and imageView disappear, but now I do not know how to automatically detect Network, and label and imageView how to put the center of the screen (not using storyboard), thank you!
and here is my code:
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()
}
}
Create label and imageView:
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

You can check for the network notifications from reachability. Then post some sorts of notification so that we would know the network status
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")
}
}
}
When this is started it will notify whenever network status has been changed.