当iTunes文件共享启用时隐藏核心数据sqlite文件 [英] Hide Core Data sqlite file when iTunes File Sharing is Enabled

问题描述

我在我的应用程序中使用iTunes文件共享，并需要将Core Data的sqlite数据库放在别处，以便用户不会搞砸。我已阅读以前的SO帖，了解最佳方式隐藏Core Data使用的sqlite文件。

I am using iTunes file sharing in my app, and need to put Core Data's sqlite database elsewhere so that users don't fiddle with it. I have read a previous SO post regarding the best way to hide the sqlite file that Core Data uses.

对于将数据库放在Library / Preferences中还是在名为 .data ，但我认为我同意最好的方法是使用 .data 目录。

There seems to be conflicting opinions regarding whether to put the database in Library/Preferences or in a directory called .data, but I think I agree the best approach is to use the .data directory.

-applicationDocumentsDirectory 方法由Core Data模板代码提供：

There is currently an -applicationDocumentsDirectory method that was provided by the Core Data template code:

- (NSString *)applicationDocumentsDirectory {
    return [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
}

我想实现一个函数 applicationHiddenDocumentsDirectory ，这将让我访问.data子目录，但我不知道Objective-C或Cocoa / Foundation框架访问该目录。

I would like to implement a function called applicationHiddenDocumentsDirectory that will give me access to the ".data" subdirectory, but I don't know enough about Objective-C or the Cocoa/Foundation frameworks to access the directory.

有人可以帮我实现这个方法吗？

Could someone help me implement this method please?

谢谢！

== Rowan ==

==Rowan==

推荐答案

如果发生错误，您必须添加相应的操作。

编辑：我改变了这样，所以数据库保存在库目录中，它由iTunes备份，用户不可见。这是由 Apple Q& A 建议的

how do you like this one? You have to add appropriate action if an error occurs.
I changed this so the database is saved in the library-directory, which is backed up by itunes and not visible to the user. This was suggested by Apple Q&A

- (NSString *)applicationHiddenDocumentsDirectory {
    // NSString *path = [[self applicationDocumentsDirectory] stringByAppendingPathComponent:@".data"];
    NSString *libraryPath = [NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES) lastObject];
    NSString *path = [libraryPath stringByAppendingPathComponent:@"Private Documents"];

    BOOL isDirectory = NO;
    if ([[NSFileManager defaultManager] fileExistsAtPath:path isDirectory:&isDirectory]) {
        if (isDirectory)
            return path;
        else {
            // Handle error. ".data" is a file which should not be there...
            [NSException raise:@".data exists, and is a file" format:@"Path: %@", path];
            // NSError *error = nil;
            // if (![[NSFileManager defaultManager] removeItemAtPath:path error:&error]) {
            //     [NSException raise:@"could not remove file" format:@"Path: %@", path];
            // }
        }
    }
    NSError *error = nil;
    if (![[NSFileManager defaultManager] createDirectoryAtPath:path withIntermediateDirectories:YES attributes:nil error:&error]) {
        // Handle error.
        [NSException raise:@"Failed creating directory" format:@"[%@], %@", path, error];
    }
    return path;
}

这篇关于当iTunes文件共享启用时隐藏核心数据sqlite文件的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！