fix: retain typed Vision compute device references

src-tauri/src/ocr/tests/diagnose-vision.swift

@@ -13,10 +13,13 @@ print("Vision supported revisions: \(VNRecognizeTextRequest.supportedRevisions)"
 
 func assignCPU(_ request: VNRecognizeTextRequest) throws {
     if #available(macOS 14.0, *) {
-        let stages = try request.supportedComputeStageDevices()
+        let stages = try request.supportedComputeStageDevices
         for (stage, devices) in stages {
             print("compute stage \(stage): \(devices)")
-            if let cpu = devices.first(where: { $0 is MLCPUComputeDevice }) {
+            if let cpu = devices.first(where: {
+                if case .cpu(_) = $0 { return true }
+                return false
+            }) {
                 request.setComputeDevice(cpu, for: stage)
             }
         }

src-tauri/src/ocr/vision.rs

@@ -129,12 +129,12 @@ fn configure_cpu(request: &VNRecognizeTextRequest) -> Result<(), String> {
                 .map_err(|error| format!("读取 OCR 计算设备失败: {error}"))?;
             let mut assigned = false;
             for stage in stages.allKeys().iter() {
-                if let Some(devices) = stages.objectForKey(stage) {
+                if let Some(devices) = stages.objectForKey(&stage) {
                     if let Some(cpu) = devices
                         .iter()
                         .find(|device| device.isKindOfClass(MLCPUComputeDevice::class()))
                     {
-                        request.setComputeDevice_forComputeStage(Some(cpu), stage);
+                        request.setComputeDevice_forComputeStage(Some(&cpu), &stage);
                         assigned = true;
                     }
                 }