使用启用iCloud的Core Data NSArray采取方法 [英] Using iCloud enabled Core Data NSArray-taking method
问题描述
我一直在我的应用中设置和测试Core Data，并且在本地一切正常。但是，只要我通过以下方式启用iCloud，就可以：
NSDictionary *选项；
if（[self iCloudEnabled]）{
选项= @ {NSSQLitePragmasOption：@ {@ journal_mode：@ DELETE}，
NSPersistentStoreUbiquitousContentNameKey：@ iCloudStore};
[self SubscribeToNotifications];
} else
选项= @ {NSSQLitePragmasOption：@ {@ journal_mode：@ DELETE}};
并运行我的应用程序，在控制台中出现以下错误：
***错误：此进程调用了NSArray采用方法，例如initWithArray :，并传入了NSSet对象。目前正在解决此问题，但很快会引起您的悲伤。
打印完该错误后，一切似乎都可以正常工作。
我能找到的唯一其他相关问题是这里并 。 = j&q; q =& esrc = s& source = web& cd = 2& cad = rja& uact = 8& ved = 0CCUQFjAB& url = http％3A％2F％2Fstackoverflow.com％2Fquestions％2F25528019％2Fcore-data -relation-between-objects& ei = -8XSVOXgE6nbsASdi4DoDg& usg = AFQjCNE_unN7JH0jVJcoq7CSm1bFLA-PaQ& sig2 = GYXrEr5vj1-qW2nkBJRHkQ $ ，都不是有用的， b
我什至找不到
感谢任何帮助。
编辑：根据我的经验发现它是在初始化ManagedObjectContext之后并且在将使用本地存储：0打印到控制台之前发生的。问题是，我不知道那段时间正在执行什么操作（因为我什么也没打电话）；
EDIT2：我还应该提到，这仅在应用程序首次启动时发生（在iCloud上一次性）
EDIT3：这是初始化我的上下文的代码：
-（NSURL *）coreDataLocalURL {
//应用程序用于存储核心数据存储文件的目录。
NSURL * result = [[[[NSFileManager defaultManager] URLsForDirectory：NSDocumentDirectory inDomains：NSUserDomainMask] lastObject];
结果= [结果URLByAppendingPathComponent：@ TheAnglersLog];
NSError * e;
if（！[[[NSFileManager defaultManager] fileExistsAtPath：result.path]）
//创建TheAnglersLog目录（如果不存在）
[[NSFileManager defaultManager] createDirectoryAtPath：result.path
withIntermediateDirectories：否
属性：nil
错误：& e];
返回结果；
}
-（NSManagedObjectModel *）managedObjectModel {
//应用程序的托管对象模型。对于应用程序来说，找不到并加载其模型是一个致命错误。
if（_managedObjectModel！= nil）
返回_managedObjectModel;
NSURL * modelURL = [[NSBundle mainBundle] URLForResource：@ TheAnglersLog withExtension：@ momd];
_managedObjectModel = [[NSManagedObjectModel alloc] initWithContentsOfURL：modelURL];
return _managedObjectModel;
}
-（NSPersistentStoreCoordinator *）persistentStoreCoordinator {
//应用程序的持久性存储协调器。此实现创建并返回了一个协调器，并已将应用程序商店添加到其中。
if（_persistentStoreCoordinator！= nil）{
return _persistentStoreCoordinator;
}
//创建协调器并存储
_persistentStoreCoordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel：[selfmanagedObjectModel]];
NSURL * storeURL = [[self coreDataLocalURL] URLByAppendingPathComponent：@ TheAnglersLog.sqlite]]；
NSError *错误=无;
NSString * failureReason = @创建或加载应用程序的已保存数据时出错。;
NSDictionary *选项；
if（[self iCloudEnabled]）{
options = @ {NSSQLitePragmasOption：@ {@ journal_mode：@ DELETE}，
NSPersistentStoreUbiquitousContentNameKey：@ TheAnglersLogCloudStore};
[self SubscribeToNotifications];
} else
选项= @ {NSSQLitePragmasOption：@ {@ journal_mode：@ DELETE}};
NSLog（@是否启用了iCloud？％@，[self iCloudEnabled]吗？@@ YES：@ NO）；
NSPersistentStore * store;
if（！（store = [_persistentStoreCoordinator addPersistentStoreWithType：NSSQLiteStoreType configuration：nil URL：storeURL options：options error：& error]））{
//报告我们得到的任何错误。
NSMutableDictionary * dict = [NSMutableDictionary字典];
dict [NSLocalizedDescriptionKey] = @无法初始化应用程序的已保存数据；
dict [NSLocalizedFailureReasonErrorKey] = failureReason;
dict [NSUnderlyingErrorKey] =错误；
错误= [NSError errorWithDomain：@ YOUR_ERROR_DOMAIN代码：9999 userInfo：dict];
NSLog（@ persistentStoreCoordinator中的错误：％@，％@，错误，[错误userInfo]）;
}
NSLog（@ Core Data URL：％@，[store URL]）;
return _persistentStoreCoordinator;
}
-（NSManagedObjectContext *）managedObjectContext {
//返回应用程序的托管对象上下文（已绑定到该应用程序的持久存储协调器。）
if（_managedObjectContext！= nil）{
返回_managedObjectContext;
}
NSPersistentStoreCoordinator * coordinator = [selfpersistentStoreCoordinator];
if（！coordinator）{
return nil;
}
_managedObjectContext = [[NSManagedObjectContext alloc] init];
[_managedObjectContext setPersistentStoreCoordinator：coordinator];
return _managedObjectContext;
}
这正是在告诉您问题所在：在某个地方（不在您发布的代码中），您正在将 NSSet 传递给需要 NSArray 的对象。 NSArray 是有序的并且包含重复项， NSSet 是无序的并且不包含重复项。它为您将其转换为一个集合，这样它就不会崩溃，但抱怨它将来可能不会继续这样做。
I've been setting up and testing Core Data in my app and everything works great locally; however, as soon as I enable iCloud via:
NSDictionary *options;
if ([self iCloudEnabled]) {
options = @{NSSQLitePragmasOption: @{@"journal_mode" : @"DELETE"},
NSPersistentStoreUbiquitousContentNameKey : @"iCloudStore"};
[self subscribeToNotifications];
} else
options = @{NSSQLitePragmasOption: @{@"journal_mode" : @"DELETE"}};
And run my app, I get the following error spammed in the console:
*** ERROR: this process has called an NSArray-taking method, such as initWithArray:, and passed in an NSSet object. This is being worked-around for now, but will soon cause you grief.
When that error is done printing, everything seems to work normally.
The only other related questions I could find were here and here, and neither of them were helpful.
I can't even find anywhere that says what that error means.
Any help is appreciated.
EDIT: From what I've found it's happening after my managedObjectContext is initialized and before the "Using local storage: 0" is printed to the console. Problem is, I have no idea what's being executed in that time (because I'm not calling anything); it seems to be in a background thread.
EDIT2: I should also mention that this only happens the first time the app is launched (on the iCloud "one-time" setup).
EDIT3: Here's the code that initializes my context:
- (NSURL *)coreDataLocalURL {
// The directory the application uses to store the Core Data store file.
NSURL *result = [[[NSFileManager defaultManager] URLsForDirectory:NSDocumentDirectory inDomains:NSUserDomainMask] lastObject];
result = [result URLByAppendingPathComponent:@"TheAnglersLog"];
NSError *e;
if (![[NSFileManager defaultManager] fileExistsAtPath:result.path])
// create TheAnglersLog directory if it doesn't exist
[[NSFileManager defaultManager] createDirectoryAtPath:result.path
withIntermediateDirectories:NO
attributes:nil
error:&e];
return result;
}
- (NSManagedObjectModel *)managedObjectModel {
// The managed object model for the application. It is a fatal error for the application not to be able to find and load its model.
if (_managedObjectModel != nil)
return _managedObjectModel;
NSURL *modelURL = [[NSBundle mainBundle] URLForResource:@"TheAnglersLog" withExtension:@"momd"];
_managedObjectModel = [[NSManagedObjectModel alloc] initWithContentsOfURL:modelURL];
return _managedObjectModel;
}
- (NSPersistentStoreCoordinator *)persistentStoreCoordinator {
// The persistent store coordinator for the application. This implementation creates and return a coordinator, having added the store for the application to it.
if (_persistentStoreCoordinator != nil) {
return _persistentStoreCoordinator;
}
// Create the coordinator and store
_persistentStoreCoordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel:[self managedObjectModel]];
NSURL *storeURL = [[self coreDataLocalURL] URLByAppendingPathComponent:@"TheAnglersLog.sqlite"];
NSError *error = nil;
NSString *failureReason = @"There was an error creating or loading the application's saved data.";
NSDictionary *options;
if ([self iCloudEnabled]) {
options = @{NSSQLitePragmasOption: @{@"journal_mode" : @"DELETE"},
NSPersistentStoreUbiquitousContentNameKey : @"TheAnglersLogCloudStore"};
[self subscribeToNotifications];
} else
options = @{NSSQLitePragmasOption: @{@"journal_mode" : @"DELETE"}};
NSLog(@"Is iCloud enabled? %@", [self iCloudEnabled] ? @"YES" : @"NO");
NSPersistentStore *store;
if (!(store = [_persistentStoreCoordinator addPersistentStoreWithType:NSSQLiteStoreType configuration:nil URL:storeURL options:options error:&error])) {
// Report any errors we got.
NSMutableDictionary *dict = [NSMutableDictionary dictionary];
dict[NSLocalizedDescriptionKey] = @"Failed to initialize the application's saved data";
dict[NSLocalizedFailureReasonErrorKey] = failureReason;
dict[NSUnderlyingErrorKey] = error;
error = [NSError errorWithDomain:@"YOUR_ERROR_DOMAIN" code:9999 userInfo:dict];
NSLog(@"Error in persistentStoreCoordinator: %@, %@", error, [error userInfo]);
}
NSLog(@"Core Data URL: %@", [store URL]);
return _persistentStoreCoordinator;
}
- (NSManagedObjectContext *)managedObjectContext {
// Returns the managed object context for the application (which is already bound to the persistent store coordinator for the application.)
if (_managedObjectContext != nil) {
return _managedObjectContext;
}
NSPersistentStoreCoordinator *coordinator = [self persistentStoreCoordinator];
if (!coordinator) {
return nil;
}
_managedObjectContext = [[NSManagedObjectContext alloc] init];
[_managedObjectContext setPersistentStoreCoordinator:coordinator];
return _managedObjectContext;
}
It's telling you precisely the problem: Somewhere (not in the code you posted), you're passing an NSSet to something which expects an NSArray. NSArray is ordered and duplicate-inclusive, NSSet is unordered and duplicate-exclusive. It converted it to a set for you so it wouldn't crash, but is complaining it may not continue to do so in the future.
这篇关于使用启用iCloud的Core Data NSArray采取方法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！
