Fix panel interactivity broken by floatingPanelState(_:) with delegate callbacks

.github/workflows/ci.yml

@@ -18,6 +18,9 @@ jobs:
       fail-fast: false
       matrix:
         include:
+          - swift: "5"
+            xcode: "26.2"
+            runs-on: macos-15
           - swift: "5"
             xcode: "16.4"
             runs-on: macos-15
@@ -37,8 +40,8 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - os: "26.0.1"
-            xcode: "26.0.1"
+          - os: "26.2"
+            xcode: "26.2"
             sim: "iPhone 16 Pro"
             parallel: NO # Stop random test job failures
             runs-on: macos-15
@@ -66,7 +69,7 @@ jobs:
   example:
     runs-on: macos-15
     env:
-      DEVELOPER_DIR: /Applications/Xcode_26.0.1.app/Contents/Developer
+      DEVELOPER_DIR: /Applications/Xcode_26.2.app/Contents/Developer
     strategy:
       fail-fast: false
       matrix:
@@ -93,21 +96,21 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        xcode: ["26.0.1", "16.4", "15.4"]
+        xcode: ["26.2", "16.4", "15.4"]
         platform: [iphoneos, iphonesimulator]
         arch: [x86_64, arm64]
         exclude:
           - platform: iphoneos
             arch: x86_64
         include:
-          # 26.0.1
+          # 26.x
           - platform: iphoneos
-            xcode: "26.0.1"
-            sys: "ios26.0"
+            xcode: "26.2"
+            sys: "ios26.2"
             runs-on: macos-15
           - platform: iphonesimulator
-            xcode: "26.0.1"
-            sys: "ios26.0-simulator"
+            xcode: "26.2"
+            sys: "ios26.2-simulator"
             runs-on: macos-15
           # 18.5
           - platform: iphoneos
@@ -138,7 +141,7 @@ jobs:
   cocoapods:
     runs-on: macos-15
     env:
-      DEVELOPER_DIR: /Applications/Xcode_26.0.1.app/Contents/Developer
+      DEVELOPER_DIR: /Applications/Xcode_26.2.app/Contents/Developer
     steps:
       - uses: actions/checkout@v4
       - name: "CocoaPods: pod lib lint"

Examples/SamplesSwiftUI/SamplesSwiftUI/UseCases/MainView.swift

@@ -15,6 +15,7 @@ struct MainView: View {
     @State private var panelLayout: FloatingPanelLayout? = MyFloatingPanelLayout()
     @State private var panelState: FloatingPanelState?
     @State private var selectedContent: CardContent = .list
+    @State private var lastEvent: MyPanelCoordinator.Event?
 
     var body: some View {
         ZStack {
@@ -28,6 +29,9 @@ struct MainView: View {
                     }
                 }
                 .pickerStyle(.segmented)
+
+                Text("Last event: \(lastEvent?.rawValue ?? "None")")
+
                 Button("Move to full") {
                     withAnimation(.interactiveSpring) {
                         panelState = .full
@@ -52,7 +56,8 @@ struct MainView: View {
             }
         }
         .floatingPanel(
-            coordinator: MyPanelCoordinator.self
+            coordinator: MyPanelCoordinator.self,
+            onEvent: onEvent
         ) { proxy in
             switch selectedContent {
             case .list:
@@ -80,11 +85,18 @@ struct MainView: View {
             Logger().debug("Panel state changed: \(newValue ?? .hidden)")
         }
     }
+
+    func onEvent(_ event: MyPanelCoordinator.Event) {
+        lastEvent = event
+    }
 }
 
 // A custom coordinator object which handles panel context updates and setting up `FloatingPanelControllerDelegate` methods
 class MyPanelCoordinator: FloatingPanelCoordinator {
-    enum Event {}
+    enum Event: String {
+        case willBeginDragging
+        case didEndAttracting
+    }
 
     let action: (Event) -> Void
     let proxy: FloatingPanelProxy
@@ -115,6 +127,14 @@ class MyPanelCoordinator: FloatingPanelCoordinator {
 }
 
 extension MyPanelCoordinator: FloatingPanelControllerDelegate {
+    func floatingPanelWillBeginDragging(_ fpc: FloatingPanelController) {
+        action(.willBeginDragging)
+    }
+
+    func floatingPanelDidEndAttracting(_ fpc: FloatingPanelController) {
+        action(.didEndAttracting)
+    }
+
     func floatingPanelDidChangeState(_ fpc: FloatingPanelController) {
         // NOTE: This timing is difference from one of the change of the binding value
         // to `floatingPanelState(_:)` modifier

FloatingPanel.xcodeproj/project.pbxproj

@@ -7,6 +7,7 @@
 	objects = {
 
 /* Begin PBXBuildFile section */
+		5404FC6D2F3D900E00BCC99B /* CoordinatorProxyTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 5404FC6B2F3D900E00BCC99B /* CoordinatorProxyTests.swift */; };
 		542753C622C49A6E00D17955 /* LayoutTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 542753C522C49A6E00D17955 /* LayoutTests.swift */; };
 		5431025B2DB8AAB800A927EF /* View+floatingPanelSurface.swift in Sources */ = {isa = PBXBuildFile; fileRef = 543102592DB8AAB800A927EF /* View+floatingPanelSurface.swift */; };
 		5431025E2DB8AAB800A927EF /* View+floatingPanelConfiguration.swift in Sources */ = {isa = PBXBuildFile; fileRef = 543102572DB8AAB800A927EF /* View+floatingPanelConfiguration.swift */; };
@@ -58,6 +59,7 @@
 /* End PBXContainerItemProxy section */
 
 /* Begin PBXFileReference section */
+		5404FC6B2F3D900E00BCC99B /* CoordinatorProxyTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = CoordinatorProxyTests.swift; sourceTree = "<group>"; };
 		542753C522C49A6E00D17955 /* LayoutTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = LayoutTests.swift; sourceTree = "<group>"; };
 		542753C722C49A8F00D17955 /* TestSupports.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = TestSupports.swift; sourceTree = "<group>"; };
 		543102572DB8AAB800A927EF /* View+floatingPanelConfiguration.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "View+floatingPanelConfiguration.swift"; sourceTree = "<group>"; };
@@ -121,6 +123,14 @@
 /* End PBXFrameworksBuildPhase section */
 
 /* Begin PBXGroup section */
+		5404FC6C2F3D900E00BCC99B /* SwiftUI */ = {
+			isa = PBXGroup;
+			children = (
+				5404FC6B2F3D900E00BCC99B /* CoordinatorProxyTests.swift */,
+			);
+			path = SwiftUI;
+			sourceTree = "<group>";
+		};
 		545DB9B72151169500CA77B8 = {
 			isa = PBXGroup;
 			children = (
@@ -169,6 +179,7 @@
 		545DB9CE2151169500CA77B8 /* Tests */ = {
 			isa = PBXGroup;
 			children = (
+				5404FC6C2F3D900E00BCC99B /* SwiftUI */,
 				54A6B6B022968B530077F348 /* CoreTests.swift */,
 				545DB9CF2151169500CA77B8 /* ControllerTests.swift */,
 				547F7A9B2A6E946000303905 /* GestureTests.swift */,
@@ -363,6 +374,7 @@
 				542753C622C49A6E00D17955 /* LayoutTests.swift in Sources */,
 				54A6B6B82296A8520077F348 /* SurfaceViewTests.swift in Sources */,
 				546055BF2333C4740069F400 /* TestSupports.swift in Sources */,
+				5404FC6D2F3D900E00BCC99B /* CoordinatorProxyTests.swift in Sources */,
 				547F7A9C2A6E946000303905 /* GestureTests.swift in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;

Sources/SwiftUI/FloatingPanelView.swift

@@ -161,6 +161,9 @@ extension FloatingPanelView {
 class FloatingPanelCoordinatorProxy {
     private let origin: any FloatingPanelCoordinator
     private var stateBinding: Binding<FloatingPanelState?>
+    /// Tracks the last binding value seen by `update(state:)` to detect actual changes
+    /// vs. stale values from unrelated SwiftUI re-renders.
+    private var lastKnownBindingState: FloatingPanelState?
 
     private var subscriptions: Set<AnyCancellable> = Set()
 
@@ -249,7 +252,12 @@ extension FloatingPanelCoordinatorProxy {
 
     // Update the state of FloatingPanelController
     func update(state: FloatingPanelState?) {
-        guard let state = state else { return }
+        defer { lastKnownBindingState = state }
+        guard
+            let state = state,
+            state != lastKnownBindingState,
+            controller.state != state
+        else { return }
         controller.move(to: state, animated: false)
     }