Question

我有以下设置：我的应用程序将UIDocument实例写入iCloud。文件同步，一切正常。但是当我试图删除它们时，它们会不断重现。在我删除文件之前，我关闭它们。以下是删除文件的代码：

- (void)deleteDocumentWithName:(NSString*)name completion:(void (^)(BOOL success))completion
{
[self stopQuery];
NSURL* toDelete = [self URLForFileWithName:name];

UIDocument* doc = [[UIDocument alloc] initWithFileURL:toDelete];

void (^deleteDocument)() = ^() {
    // Wrap in file coordinator
    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^(void) {

        NSFileCoordinator* fileCoordinator = [[NSFileCoordinator alloc] initWithFilePresenter:nil];
        [fileCoordinator coordinateWritingItemAtURL:toDelete
                                            options:NSFileCoordinatorWritingForDeleting
                                              error:nil
                                         byAccessor:^(NSURL* writingURL) {
                                             // Simple delete to start
                                             NSFileManager* fileManager = [[NSFileManager alloc] init];
                                             NSError* error = nil;
                                             [fileManager removeItemAtURL:writingURL error:&error];

                                             if (error) {
                                                 LogError(@"%s - error while deleting file: %@", __PRETTY_FUNCTION__, error);
                                             }

                                             dispatch_async(dispatch_get_main_queue(), ^{
                                                 [_files removeObject:toDelete];

                                                 if (completion) {
                                                     completion((error == nil));
                                                 }

                                                 [self startQuery];
                                             });
                                         }];
    });
};

if (doc) {
    if (doc.documentState == UIDocumentStateNormal) {
        [doc closeWithCompletionHandler:^(BOOL success) {
            if (success) {
                deleteDocument();
            } else {
                if (completion) {
                    completion(NO);
                }
            }
        }];
    } else {
        deleteDocument();
    }
}
}

执行此方法后，我得到了几个NSMetadataQueryDidFinishGatheringNotifications。首先，它不包含已删除的文件。然后捕获另一个NSMetadataQueryDidFinishGatheringNotification并再次包含已删除的文件。

我找不到原因。任何帮助表示赞赏。

Answer 1

我遇到了类似的问题。从GCD中删除NSFileCoordinator实例化的封装，然后你就可以执行删除操作了（尽管文档说它最好在后台线程中执行此操作，这很奇怪，因为这样做实际上是这样的首先导致这个无法删除的问题）

void (^deleteDocument)() = ^() {
    NSFileCoordinator* fileCoordinator = [[NSFileCoordinator alloc] initWithFilePresenter:nil];
        [fileCoordinator coordinateWritingItemAtURL:toDelete
            options:NSFileCoordinatorWritingForDeleting
            error:nil
            byAccessor:^(NSURL* writingURL) {
            // Simple delete to start
            NSFileManager* fileManager = [[NSFileManager alloc] init];
            NSError* error = nil;
            [fileManager removeItemAtURL:writingURL error:&error];

            if (error) {
            LogError(@"%s - error while deleting file: %@", __PRETTY_FUNCTION__, error);
            }

            [_files removeObject:toDelete];

            if (completion) {
            completion((error == nil));
            }

            [self startQuery];
        }];
};

删除后iCloud文件会再次出现

1 个答案: