fix: relaunching of iOS app would stop advertising

NearbyShare/Connection/NearbyConnectionManager.swift

@@ -29,6 +29,7 @@ public class NearbyConnectionManager: NSObject, NetServiceDelegate, InboundNearb
     private var shareExtensionDelegates: [OutboundAppDelegate] = []
     private var outgoingTransfers: [String: OutgoingTransferInfo] = [:]
     private var startedDeviceDiscovery = false
+    private var startedAdvertising = false
     private var browsers: [NWBrowser] = []
     private let serviceTypes = ["_FC9F5ED42C8A._tcp."]
     private var qrCodePrivateKey: ECPrivateKey?
@@ -56,11 +57,16 @@ public class NearbyConnectionManager: NSObject, NetServiceDelegate, InboundNearb
     
     
     public func becomeVisible() {
-        startTCPListener()
-    }
-    
-    
-    private func startTCPListener() {
+        if startedAdvertising {
+            log("[NearbyConnectionManager] Already advertising, skipping")
+            return
+        }
+        
+        log("[NearbyConnectionManager] Becoming visible")
+        
+        tcpListener = try! NWListener(using: NWParameters(tls: .none))
+        startedAdvertising = true
+        
         tcpListener.stateUpdateHandler = { (state: NWListener.State) in
             if case .ready = state {
                 self.initMDNS()
@@ -77,6 +83,20 @@ public class NearbyConnectionManager: NSObject, NetServiceDelegate, InboundNearb
     }
     
     
+    public func becomeInvisible() {
+        if !startedAdvertising {
+            print("[NearbyConnectionManager] Already invisible, ignoring becomeInvisible()")
+            return
+        }
+        
+        log("[NearbyConnectionManager] Becoming invisible")
+        
+        startedAdvertising = false
+        self.stopMDNS()
+        tcpListener.cancel()
+    }
+    
+    
     private static func generateEndpointID() -> [UInt8] {
         let userDefaultsKey = UserDefaultsKeys.endpointID.rawValue
         
@@ -125,6 +145,15 @@ public class NearbyConnectionManager: NSObject, NetServiceDelegate, InboundNearb
     }
     
     
+    private func stopMDNS() {
+        // Gracefully stop each published service
+        for service in mdnsServices {
+            service.stop()
+        }
+        mdnsServices.removeAll()
+    }
+    
+    
     func obtainUserConsent(for transfer: TransferMetadata, from device: RemoteDeviceInfo, connection _: InboundNearbyConnection) {
         mainAppDelegate?.obtainUserConsent(for: transfer, from: device)
     }
@@ -188,7 +217,7 @@ public class NearbyConnectionManager: NSObject, NetServiceDelegate, InboundNearb
     public func stopDeviceDiscovery() {
         if startedDeviceDiscovery {
             
-            log("Stopping device discovery")
+            log("[NearbyConnectionManager] Stopping device discovery")
             
             for browser in browsers {
                 browser.cancel()
@@ -196,6 +225,15 @@ public class NearbyConnectionManager: NSObject, NetServiceDelegate, InboundNearb
             
             browsers.removeAll()
             startedDeviceDiscovery = false
+            
+            
+            for delegate in shareExtensionDelegates {
+                
+                foundServices.values.forEach { service in
+                    guard let device = service.device, let id = device.id else { return }
+                    delegate.removeDevice(id: id)
+                }
+            }
         }
     }
     

NearbyShare/Util/Logger.swift

@@ -24,14 +24,8 @@ final class LogManager {
     
     /// Private initializer
     private init() {
-        
-        #if os(macOS)
         // Use the App Group container
         let directory = getAppGroupDirectory()
-        #else
-        // On iOS, use the library directory, to not let the logs appear in the files app
-        let directory = FileManager.default.urls(for: .libraryDirectory, in: .userDomainMask).first
-        #endif
         
         // Create file name from date
         let formatter = DateFormatter()
@@ -133,7 +127,7 @@ public func log(_ text: String) {
 
 
 /// Returns the shared App Group directory
-fileprivate func getAppGroupDirectory() -> URL? {
+func getAppGroupDirectory() -> URL? {
     let groupIdentifier = "group.com.leonboettger.neardrop"
     return FileManager.default.containerURL(forSecurityApplicationGroupIdentifier: groupIdentifier)
 }

QuickDrop.xcodeproj/project.xcworkspace/xcshareddata/swiftpm/Package.resolved

@@ -43,7 +43,7 @@
       "location" : "https://github.com/leonboe1/LUI.git",
       "state" : {
         "branch" : "main",
-        "revision" : "b4a9766db0f328c8251b1fa8bed2472c783d7128"
+        "revision" : "0fa79d937a5948c59f44c64b12af21c7d3b408e5"
       }
     },
     {

QuickDropiOS/Configuration.swift

@@ -14,6 +14,8 @@ let configuration = LUIConfiguration(
     
     copyrightInformation: licenseText,
     
+    loggingUrl: getAppGroupDirectory(),
+    
     introductionViewInformation: "QuickDropWelcomeDescription",
     
     usesAutomaticReviewPrompt: false,

QuickDropiOS/ContentView.swift

@@ -10,6 +10,8 @@ import LUI
 
 struct ContentView: View {
     
+    @Environment(\.scenePhase) var scenePhase
+    
     var body: some View {
         AppRootView(isPlus: .constant(true), phoneView: {
             DeviceListView()
@@ -23,6 +25,21 @@ struct ContentView: View {
                 }
             }
         })
+        .onChange(of: scenePhase) { newValue in
+            if newValue == .active {
+                #if !EXTENSION
+                NearbyConnectionManager.shared.becomeVisible()
+                #endif
+                NearbyConnectionManager.shared.startDeviceDiscovery()
+            }
+            
+            if newValue == .background {
+                #if !EXTENSION
+                NearbyConnectionManager.shared.becomeInvisible()
+                #endif
+                NearbyConnectionManager.shared.stopDeviceDiscovery()
+            }
+        }
     }
 }
 

iOSShareExtension/ShareViewController.swift

@@ -29,6 +29,7 @@ class ShareViewController: UIViewController {
         })
         
         // skip introduction for share extension
+        LUIInit(configuration: configuration)
         LUISettings.sharedInstance.appLaunchedBefore = true
         
         // Replace with your app’s SwiftUI entry view