1

Shared/KBSkinInstallBridge.m

@@ -133,25 +133,36 @@ typedef NS_ENUM(NSUInteger, KBSkinBridgeErrorCode) {
         return NO;
     }
 
-    NSURL *containerURL = [[NSFileManager defaultManager] containerURLForSecurityApplicationGroupIdentifier:AppGroup];
-    if (!containerURL) {
-        if (error) {
-            *error = [NSError errorWithDomain:kKBSkinBridgeErrorDomain
-                                         code:KBSkinBridgeErrorContainerUnavailable
-                                     userInfo:@{NSLocalizedDescriptionKey: @"App Group container unavailable"}];
+    // 皮肤根目录：优先 App Group，若不可写则退回当前进程的 Caches 目录。
+    NSFileManager *fm = [NSFileManager defaultManager];
+    NSString *baseRoot = nil;
+    NSURL *containerURL = [fm containerURLForSecurityApplicationGroupIdentifier:AppGroup];
+    if (containerURL.path.length > 0) {
+        // 探测写权限：在 Skins/.kb_write_test 下创建临时目录
+        NSString *testDir = [[containerURL.path stringByAppendingPathComponent:@"Skins"]
+                             stringByAppendingPathComponent:@".kb_write_test"];
+        NSError *probeError = nil;
+        BOOL canWrite = [fm createDirectoryAtPath:testDir
+                       withIntermediateDirectories:YES
+                                        attributes:nil
+                                             error:&probeError];
+        if (canWrite) {
+            baseRoot = containerURL.path;
+            [fm removeItemAtPath:testDir error:NULL];
         }
-        return NO;
+    }
+    if (baseRoot.length == 0) {
+        NSArray<NSString *> *dirs = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);
+        baseRoot = dirs.firstObject ?: NSTemporaryDirectory();
     }
 
-    NSString *skinsRoot = [containerURL.path stringByAppendingPathComponent:@"Skins"];
+    NSString *skinsRoot = [baseRoot stringByAppendingPathComponent:@"Skins"];
     NSString *skinRoot = [skinsRoot stringByAppendingPathComponent:skinId];
     NSString *iconsDir = [skinRoot stringByAppendingPathComponent:@"icons"];
-    [[NSFileManager defaultManager] createDirectoryAtPath:iconsDir
-                              withIntermediateDirectories:YES
-                                               attributes:nil
-                                                    error:NULL];
-
-    NSFileManager *fm = [NSFileManager defaultManager];
+    [fm createDirectoryAtPath:iconsDir
+   withIntermediateDirectories:YES
+                    attributes:nil
+                         error:NULL];
     BOOL isDir = NO;
     BOOL hasIconsDir = [fm fileExistsAtPath:iconsDir isDirectory:&isDir] && isDir;
     NSArray *contents = hasIconsDir ? [fm contentsOfDirectoryAtPath:iconsDir error:NULL] : nil;