Create repo, add feature to set username

Peered/Assets.xcassets/AccentColor.colorset/Contents.json

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+{
+  "colors" : [
+    {
+      "idiom" : "universal"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

Peered/Assets.xcassets/AppIcon.appiconset/Contents.json

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+{
+  "images" : [
+    {
+      "idiom" : "universal",
+      "platform" : "ios",
+      "size" : "1024x1024"
+    },
+    {
+      "appearances" : [
+        {
+          "appearance" : "luminosity",
+          "value" : "dark"
+        }
+      ],
+      "idiom" : "universal",
+      "platform" : "ios",
+      "size" : "1024x1024"
+    },
+    {
+      "appearances" : [
+        {
+          "appearance" : "luminosity",
+          "value" : "tinted"
+        }
+      ],
+      "idiom" : "universal",
+      "platform" : "ios",
+      "size" : "1024x1024"
+    },
+    {
+      "idiom" : "mac",
+      "scale" : "1x",
+      "size" : "16x16"
+    },
+    {
+      "idiom" : "mac",
+      "scale" : "2x",
+      "size" : "16x16"
+    },
+    {
+      "idiom" : "mac",
+      "scale" : "1x",
+      "size" : "32x32"
+    },
+    {
+      "idiom" : "mac",
+      "scale" : "2x",
+      "size" : "32x32"
+    },
+    {
+      "idiom" : "mac",
+      "scale" : "1x",
+      "size" : "128x128"
+    },
+    {
+      "idiom" : "mac",
+      "scale" : "2x",
+      "size" : "128x128"
+    },
+    {
+      "idiom" : "mac",
+      "scale" : "1x",
+      "size" : "256x256"
+    },
+    {
+      "idiom" : "mac",
+      "scale" : "2x",
+      "size" : "256x256"
+    },
+    {
+      "idiom" : "mac",
+      "scale" : "1x",
+      "size" : "512x512"
+    },
+    {
+      "idiom" : "mac",
+      "scale" : "2x",
+      "size" : "512x512"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

Peered/Assets.xcassets/Contents.json

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+{
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

Peered/CommunicationProvider.swift

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+//
+//  CommunicationProvider.swift
+//  Peered
+//
+//  Created by Oskar Chybowski on 11/05/2025.
+//
+
+import Foundation
+import MultipeerConnectivity
+
+@Observable
+final class CommunicationProvider: NSObject, MCNearbyServiceBrowserDelegate {
+  private let session: MCSession
+  private let browser: MCNearbyServiceBrowser
+  private let advertiser: MCNearbyServiceAdvertiser
+
+  private(set) var availablePeers: [MCPeerID] = []
+
+  init(id: String) {
+    let id = MCPeerID(displayName: id)
+    session = MCSession(peer: id, securityIdentity: nil, encryptionPreference: .required)
+    browser = MCNearbyServiceBrowser(peer: id, serviceType: "peered")
+    advertiser = MCNearbyServiceAdvertiser(
+      peer: browser.myPeerID,
+      discoveryInfo: [:],
+      serviceType: "peered"
+    )
+    super.init()
+    browser.delegate = self
+    start()
+  }
+
+  func start() {
+    advertiser.startAdvertisingPeer()
+    browser.startBrowsingForPeers()
+  }
+
+  func stop() {
+    browser.stopBrowsingForPeers()
+    advertiser.stopAdvertisingPeer()
+  }
+
+  func browser(
+    _ browser: MCNearbyServiceBrowser,
+    foundPeer peerID: MCPeerID,
+    withDiscoveryInfo info: [String: String]?
+  ) {
+    availablePeers.append(peerID)
+    browser.invitePeer(peerID, to: session, withContext: nil, timeout: 30)
+  }
+
+  func browser(_ browser: MCNearbyServiceBrowser, lostPeer peerID: MCPeerID) {
+    availablePeers.removeAll { id in
+      id == peerID
+    }
+  }
+}

Peered/ContentView.swift

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+//
+//  ContentView.swift
+//  Peered
+//
+//  Created by Oskar Chybowski on 11/05/2025.
+//
+
+import SwiftUI
+
+struct ContentView: View {
+  @AppStorage("peered_username") private var username: String = ""
+  @State var browser: CommunicationProvider? = nil
+
+  var body: some View {
+    VStack {
+      if let browser {
+        ForEach(browser.availablePeers, id: \.displayName) { peer in
+          Text(peer.displayName)
+        }
+      }
+    }
+    .padding()
+    .sheet(isPresented: .constant(username.isEmpty)) {
+      SetUserNameBottomSheetView(username: $username)
+    }
+    .onChange(of: username) { _, newValue in
+      guard !newValue.isEmpty else { return }
+      browser = .init(id: newValue)
+    }
+  }
+}
+
+#Preview {
+  ContentView()
+}

Peered/Info.plist

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>NSBonjourServices</key>
+	<array>
+		<string>_peered._tcp</string>
+	</array>
+	<key>NSServices</key>
+	<array>
+		<dict/>
+	</array>
+</dict>
+</plist>

Peered/Peered.entitlements

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>com.apple.security.app-sandbox</key>
+	<true/>
+	<key>com.apple.security.files.user-selected.read-only</key>
+	<true/>
+	<key>com.apple.security.network.client</key>
+	<true/>
+	<key>com.apple.security.network.server</key>
+	<true/>
+</dict>
+</plist>

Peered/PeeredApp.swift

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+//
+//  PeeredApp.swift
+//  Peered
+//
+//  Created by Oskar Chybowski on 11/05/2025.
+//
+
+import SwiftUI
+
+@main
+struct PeeredApp: App {
+  var body: some Scene {
+    WindowGroup {
+      ContentView()
+    }
+  }
+}

Peered/SetUsername/SetUserNameBottomSheetView.swift

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+import SwiftUI
+
+struct SetUserNameBottomSheetView: View {
+  @State private var proposedUsername: String = ""
+  @Binding var username: String
+
+  var body: some View {
+    Form {
+      Section("Set your username") {
+        TextField("Username", text: $proposedUsername)
+      }
+
+      Button("Save username") {
+        username = proposedUsername
+      }
+    }
+    .interactiveDismissDisabled()
+  }
+}