fix图片预加载

dimensionhub/Core/CacheManager.swift

@@ -19,13 +19,17 @@ final class CacheManager {
         self.cacheDir = paths[0]
     }
     
+    // 预加载图片
     func preloadImages(urls: [String]) async throws {
+        let preloadUrls =  urls.filter { url in !self.fileExists(urlString: url)}
+        
         // 批量异步加载
         try await withThrowingTaskGroup(of: Void.self) { group in
-            for url in urls {
+            for url in preloadUrls {
                 group.addTask {
-                    if let data = try? await self.downloadImage(from: url) {
-                        try? self.saveCacheFile(filename: "xx", data: data)
+                    if let filename = self.getCacheFileName(urlString: url),
+                       let data = try? await self.downloadImage(from: url) {
+                        try? self.saveCacheFile(filename: filename, data: data)
                     }
                 }
             }
@@ -33,6 +37,29 @@ final class CacheManager {
         }
     }
     
+    // 判断缓存文件是否存在
+    func fileExists(urlString: String) -> Bool {
+        guard let cacheFileName = getCacheFileName(urlString: urlString) else {
+            return false
+        }
+        
+        let url = cacheDir.appendingPathComponent(cacheFileName)
+        return FileManager.default.fileExists(atPath: url.path())
+    }
+    
+    // 读取文件内容
+    func readFileContents(urlString: String) -> Data? {
+        guard let cacheFileName = getCacheFileName(urlString: urlString) else {
+            return nil
+        }
+        
+        let url = cacheDir.appendingPathComponent(cacheFileName)
+        if FileManager.default.fileExists(atPath: url.path()) {
+            return try? Data(contentsOf: url)
+        }
+        return nil
+    }
+    
     // 保存文件到缓存
     private func saveCacheFile(filename: String, data: Data) throws {
         let fileURL = cacheDir.appendingPathComponent(filename)

dimensionhub/Views/Index/IndexMainView.swift

@@ -143,12 +143,22 @@ struct IndexMainView: View {
             indexModel.visiblePublisher.send(frames)
         }
         .onAppear {
-            let x = CacheManager.shared.getCacheFileName(urlString: "https://www.baidu.com/x/y/z.jpg?ts=1234")
-            let x1 = CacheManager.shared.getCacheFileName(urlString: "https://www.baidu.com/x/y/z.jpg")
-            print("x: \(x), x1: \(x1)")
+            Task {
+                let imageUrl = "https://lain.bgm.tv/pic/cover/l/ea/c4/479788_3pcsw.jpg"
+                let cacheManager = CacheManager.shared
+                
+                try await cacheManager.preloadImages(urls: [imageUrl])
+                
+                let result = cacheManager.fileExists(urlString: imageUrl)
+                print("cache file exists: \(result)")
+                
+                print("data: ")
+                print(cacheManager.readFileContents(urlString: imageUrl))
+                
             }
             
         }
+    }
     
 }