我使用以下代码创建了一个 NSPersistentStore
。
NSPersistentStore * pc = [persistentCoordinator
addPersistentStoreWithType:EncryptedStoreType
configuration:nil
URL:databaseURL
options:options
error:error];
if (*error)
{
NSLog(@"Unable to add persistent store.");
NSLog(@"Error: %@\n%@\n%@", *error, [*error userInfo], [*error localizedDescription]);
}
选项options
的值为
{
EncryptedStore = SQLite;
EncryptedStoreDatabaseLocation =
"file:///var/mobile/Containers/Data/Application/0C27F628-3FF0-467F-8EF1-5974EBBD3620/Documents/DBEncrypted.sqlite";
EncryptedStorePassphrase = "xxxxxxxxredactedxxxxxxx";
NSInferMappingModelAutomaticallyOption = 1;
NSMigratePersistentStoresAutomaticallyOption = 1;
NSSQLitePragmasOption = {
synchronous = OFF;
};
}
此时*error
和pc
都是nil
。
根据苹果的文档,如果该函数返回nil
,则应该是一个错误。有人之前看到过吗?
EncryptedStoreType
来自https://github.com/project-imas/encrypted-core-data
只有在迁移数据存储时才会出现该错误。
编辑:方法的完整代码:
+ (NSPersistentStoreCoordinator *)makeStoreWithOptions:(NSDictionary *)options managedObjectModel:(NSManagedObjectModel *)objModel error:(NSError *__autoreleasing *)error
{
NSPersistentStoreCoordinator * persistentCoordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel:objModel];
// NSString* appSupportDir = [NSSearchPathForDirectoriesInDomains(NSApplicationSupportDirectory, NSUserDomainMask, YES) objectAtIndex:0];
BOOL backup = YES;
NSURL *databaseURL;
id dburl = [options objectForKey:EncryptedStoreDatabaseLocation];
if(dburl != nil) {
if ([dburl isKindOfClass:[NSString class]]){
databaseURL = [NSURL URLWithString:[options objectForKey:EncryptedStoreDatabaseLocation]];
backup = NO;
}
else if ([dburl isKindOfClass:[NSURL class]]){
databaseURL = dburl;
backup = NO;
}
}
if (backup){
NSString *dbNameKey = (__bridge NSString *)kCFBundleNameKey;
NSString *dbName = NSBundle.mainBundle.infoDictionary[dbNameKey];
NSFileManager *fileManager = [NSFileManager defaultManager];
NSURL *applicationSupportURL = [[fileManager URLsForDirectory:NSDocumentDirectory inDomains:NSUserDomainMask] lastObject];
[fileManager createDirectoryAtURL:applicationSupportURL withIntermediateDirectories:NO attributes:nil error:nil];
databaseURL = [applicationSupportURL URLByAppendingPathComponent:[dbName stringByAppendingString:@".sqlite"]];
}
[persistentCoordinator addPersistentStoreWithType:EncryptedStoreType configuration:nil URL:databaseURL
options:options error:error];
if (*error)
{
NSLog(@"Unable to add persistent store.");
NSLog(@"Error: %@\n%@\n%@", *error, [*error userInfo], [*error localizedDescription]);
}
return persistentCoordinator;
}
我称之为 “in”
- (void) initCoreDataProperties
{
NSError *error;
// Creating the Managed Object Model from momd
NSURL *modelURL = [[NSBundle mainBundle] URLForResource:TBCoreDataModelFileName withExtension:@"momd"];
_managedObjectModel = [[NSManagedObjectModel alloc] initWithContentsOfURL:modelURL];
// Creating the Encrypted Store Persistent Coordinator
_persistentStoreCoordinator = [EncryptedStore makeStoreWithOptions: [self persistentStoreOptions]
managedObjectModel: self.managedObjectModel
error: &error];
makeStoreWithOptions:managedObjectModel:error:
方法,并包含你如何声明传入的error
值。 - rmaddy