Fix additional lifecycle bugs: countdown timer leak, PreviewScreen unmount state updates, CameraView ready loops

src/screens/PreviewScreen.tsx

@@ -72,6 +72,14 @@ export default function PreviewScreen({
 
   // Sticker state
   const [stickers, setStickers] = useState<StickerData[]>([]);
+  const [selectedImageIndex, setSelectedImageIndex] = useState<number | null>(null);
+
+  const mountedRef = useRef(true);
+  useEffect(() => {
+    return () => {
+      mountedRef.current = false;
+    };
+  }, []);
   const [selectedStickerId, setSelectedStickerId] = useState<string | null>(null);
   const [showStickerTray, setShowStickerTray] = useState<boolean>(false);
 
@@ -214,6 +222,7 @@ export default function PreviewScreen({
     try {
       setStatusMessage('Bild wird generiert...');
       const printUri = await captureComposite(currentPhoto);
+      if (!mountedRef.current) return;
 
       setStatusMessage('Druckauftrag wird an Drucker gesendet...');
       await printImageLocal(printUri, {
@@ -223,13 +232,16 @@ export default function PreviewScreen({
 
       setStatusMessage('Wird in Galerie gespeichert...');
       await saveToGallery(printUri);
+      if (!mountedRef.current) return;
 
       setStatusMessage('Druck erfolgreich! Viel Spaß! 🎉');
       setTimeout(() => {
+        if (!mountedRef.current) return;
         setIsProcessing(false);
         onReset();
       }, 2000);
     } catch (error: any) {
+      if (!mountedRef.current) return;
       console.error('Printing failed:', error);
       alert('Fehler: ' + error.message);
       setIsProcessing(false);
@@ -243,16 +255,20 @@ export default function PreviewScreen({
     setStatusMessage('Bild wird generiert...');
     try {
       const saveUri = await captureComposite(currentPhoto);
+      if (!mountedRef.current) return;
 
       setStatusMessage('Wird in Galerie gespeichert...');
       await saveToGallery(saveUri);
+      if (!mountedRef.current) return;
 
       setStatusMessage('Erfolgreich gespeichert!');
       setTimeout(() => {
+        if (!mountedRef.current) return;
         setIsProcessing(false);
         onReset();
       }, 1500);
     } catch (error: any) {
+      if (!mountedRef.current) return;
       console.error('Saving failed:', error);
       alert('Fehler: ' + error.message);
       setIsProcessing(false);
@@ -272,13 +288,17 @@ export default function PreviewScreen({
     setStatusMessage('Wird gespeichert...');
     try {
       const capturedUri = await captureComposite(state.currentPhoto);
+      if (!mountedRef.current) return;
       await saveToGallery(capturedUri);
+      if (!mountedRef.current) return;
       setStatusMessage('Erfolgreich gespeichert!');
       setTimeout(() => {
+        if (!mountedRef.current) return;
         setIsProcessing(false);
         state.onReset();
       }, 1000);
     } catch (error) {
+      if (!mountedRef.current) return;
       console.error('Auto-saving on exit failed:', error);
       setIsProcessing(false);
       state.onReset();
@@ -307,9 +327,12 @@ export default function PreviewScreen({
       setStatusMessage('Wird vor dem Wiederholen gespeichert...');
       try {
         const capturedUri = await captureComposite(currentPhoto);
+        if (!mountedRef.current) return;
         await saveToGallery(capturedUri);
-      } catch (error) {
-        console.error('Auto-saving before retake failed:', error);
+        if (!mountedRef.current) return;
+      } catch (e) {
+        if (!mountedRef.current) return;
+        console.error('Failed to auto-save before retake:', e);
       }
       setIsProcessing(false);
     }