Automatically delete temporary files after file transfer

NearbyShare/Connection/NearbyConnectionManager.swift

@@ -410,8 +410,8 @@ public class NearbyConnectionManager: NSObject, NetServiceDelegate, InboundNearb
         if let transfer = incomingConnections[id] {
             transfer.cancel()
         }
-        if let transfer = outgoingTransfers[id] {
-            transfer.connection.cancel()
+        if let info = outgoingTransfers[id] {
+            info.connection.cancel()
         }
     }
     
@@ -650,7 +650,6 @@ public class NearbyConnectionManager: NSObject, NetServiceDelegate, InboundNearb
                 if accessSuccess {
                     url.stopAccessingSecurityScopedResource()
                 }
-                
             }
             else {
                 log("[NearbyConnectionManager] File URL \(url) does not point to a security scoped resource")

NearbyShare/Connection/OutboundNearbyConnection.swift

@@ -63,6 +63,18 @@ class OutboundNearbyConnection: NearbyConnection {
     override func disconnect() {
         super.disconnect()
   
+        // delete all files
+        for url in urlsToSend {
+            
+            do {
+                try FileManager.default.removeItem(at: url)
+                log("[OutboundNearbyConnection \(self.id)] Deleted file at \(url).")
+            }
+            catch {
+                log("[OutboundNearbyConnection \(self.id)] Failed to delete file at \(url): \(error)")
+            }
+        }
+        
         if let error = lastError {
             DispatchQueue.main.async {
                 self.delegate?.failedWithError(connection: self, error: error)