Question

我在我的应用程序中使用iTunes文件共享，并且需要将Core Data的sqlite数据库放在别处，以便用户不会使用它。我已阅读a previous SO post关于隐藏Core Data使用的sqlite文件的最佳方法。

关于是否将数据库放在Library / Preferences或名为.data的目录中似乎存在矛盾的意见，但我认为我同意最好的方法是使用.data目录。 / p>

目前，核心数据模板代码提供了-applicationDocumentsDirectory方法：

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

我想实现一个名为applicationHiddenDocumentsDirectory的函数，它可以让我访问“.data”子目录，但我不太了解Objective-C或Cocoa / Foundation框架来访问目录。

有人可以帮我实现这个方法吗？

谢谢！

==罗文==

Answer 1

你怎么喜欢这个？如果发生错误，您必须添加适当的操作编辑：我改变了这一点，因此数据库保存在库目录中，该目录由itunes备份，对用户不可见。这是Apple Q&A

建议的

- (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;
}

Answer 2

当新的CoreData模板返回NSURL对象而不是NSString路径时，这是我上面代码的更新版本：

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

  BOOL isDirectory = NO;
  if ([[NSFileManager defaultManager] fileExistsAtPath:path isDirectory:&isDirectory]) {
    if (isDirectory) {
      return pathURL;
    } else {
      // Handle error. ".data" is a file which should not be there...
      [NSException raise:@"'Private Documents' 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 pathURL;
}

启用iTunes文件共享时隐藏核心数据sqlite文件

2 个答案: