我正尝试在Library/Application-Support
文件夹中添加一个sqlite持久性存储,如下所示:
- (NSManagedObjectModel *)managedObjectModel
{
if (!_managedObjectModel)
{
NSURL *modelURL = [[NSBundle mainBundle] URLForResource:@"delete" withExtension:@"momd"];
_managedObjectModel = [[NSManagedObjectModel alloc] initWithContentsOfURL:modelURL];
}
return _managedObjectModel;
}
- (NSPersistentStoreCoordinator *)persistentStoreCoordinator
{
if (!_persistentStoreCoordinator)
{
@synchronized(self)
{
if (!_persistentStoreCoordinator)
{
NSError *error = nil;
NSURL *storeURL = [[[[NSFileManager defaultManager] URLsForDirectory:NSApplicationSupportDirectory inDomains:NSUserDomainMask] lastObject] @"delete.sqlite"];
NSPersistentStoreCoordinator *persistentStoreCoordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel:self.managedObjectModel];
NSPersistentStore * persistentStore = [persistentStoreCoordinator addPersistentStoreWithType:NSSQLiteStoreType configuration:nil URL:storeURL options:nil error:&error];
_persistentStoreCoordinator = persistentStoreCoordinator;
}
}
}
return _persistentStoreCoordinator;
}
此操作失败,并显示以下错误:
CoreData: error: -addPersistentStoreWithType:SQLite configuration:(null)
URL:file:///Users/harshithg/Library/Developer/CoreSimulator/Devices/D9A32558-558A-4E0E-915D-FEF25C772669/data/Containers/Data/Application/9517BBBB-E383-467E-B0E2-8960B734B239/Library/Application%20Support/delete.sqlite
options:(null) ...
returned error NSCocoaErrorDomain(512) with userInfo dictionary { reason = "Failed to create file; code = 2";
我在iOS 13.3和Xcode 11.3上。有人知道这里发生了什么吗?
答案 0 :(得分:1)
“应用程序支持”文件夹不存在,除非您明确创建它。您的代码均未创建它。有一个NSFileManager方法可以为您提供NSApplicationSupportDirectory URL 并同时创建它(如果尚不存在)。