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[英]iOS app disable iCloud drive(off) in device settings page and get iCloud persistentStore
[英]rename persistentstore coordinator URL
我有一个(可以)简单的修复我的coredata持久性商店的问题。
我创建它:
- (NSPersistentStoreCoordinator *)persistentStoreCoordinator
{
if (persistentStoreCoordinator != nil)
{
return persistentStoreCoordinator;
}
NSURL *storeURL = [[self applicationDocumentsDirectory] URLByAppendingPathComponent:@"dummyURL.sqlite"];
NSError *error = nil;
persistentStoreCoordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel:[self managedObjectModel]];
if (![persistentStoreCoordinator addPersistentStoreWithType:NSSQLiteStoreType configuration:nil URL:storeURL options:nil error:&error])
{
NSLog(@"Unresolved error %@, %@", error, [error userInfo]);
abort();
}
return persistentStoreCoordinator;
}
使用url dummyURL.sqlite
我在使用该项目的第一天就这样做了,并且忘记了重命名..现在我所有现有的测试设备(4)都在使用超过2个月,使用该应用程序,收集大量数据并存储它一个愚蠢的网址^^
更新我做了一些关于持久性存储迁移的研究并编写了这个函数:
-(void)migrate{
NSPersistentStoreCoordinator *psc = [self.dataHandler.managedObjectContext persistentStoreCoordinator];
NSURL *oldURL = [psc URLForPersistentStore:[[psc persistentStores]objectAtIndex:0]];
AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];
NSURL *newURL = [[appDelegate applicationDocumentsDirectory] URLByAppendingPathComponent:@"database.sqlite"];
NSError *error = nil;
NSPersistentStore *oldStore = [psc persistentStoreForURL:oldURL];
NSPersistentStore *newStore = [psc migratePersistentStore:sqliStoreOld
toURL:newURL
options:nil
withType:NSSQLiteStoreType
error:&error];
}
问题1 will this work or will i lose some data with that?
问题2 afterwards will i just have to change the appendString in my persistenstore function?
我设法使用migratePersistentStore函数自己解决:
-(void)migrate{
NSPersistentStoreCoordinator *psc = [self.dataHandler.managedObjectContext persistentStoreCoordinator];
NSURL *oldURL = [psc URLForPersistentStore:[[psc persistentStores]objectAtIndex:0]];
AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];
NSURL *newURL = [[appDelegate applicationDocumentsDirectory] URLByAppendingPathComponent:@"database.sqlite"];
NSError *error = nil;
NSPersistentStore *oldStore = [psc persistentStoreForURL:oldURL];
NSPersistentStore *newStore = [psc migratePersistentStore:sqliStoreOld
toURL:newURL
options:nil
withType:NSSQLiteStoreType
error:&error];
}
之后我刚刚在appDelegate中将appendURL更改为database.sqli
。 奇迹般有效 :)
我建议使用新URL创建第二个持久性存储,并在某处添加一个按钮,将所有数据复制到新数据中。 在从应用程序中删除旧数据之前,请确保进行测试以确保所有数据都在新的持久存储中。
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