使用 Magical Record 的 removeUbiquitousContentAndPersistentStoreAtURL “Must pass in a store name”错误答案

【问题标题】：removeUbiquitousContentAndPersistentStoreAtURL "Must pass in a store name" error using Magical Record使用 Magical Record 的 removeUbiquitousContentAndPersistentStoreAtURL “Must pass in a store name”错误
【发布时间】：2015-10-20 14:53:55
【问题描述】：

所以我成功地将 Magical Record 与我的 Core Data/iCloud 应用程序一起使用。这是我初始化它的方式：

- (NSString *) iCloudContainerID {

    return [NSString stringWithFormat:@"iCloud.%@", [[NSBundle mainBundle] bundleIdentifier]];
}

- (NSString *) localStoreName {

    return @"test.sqlite";
}

- (NSString *) iCloudContentNameKey {

    return @"test";
}

- (void) setupCoreDataWithiCloud {

    NSString *containerID = [self iCloudContainerID];
    DDLogiCloud(@"Setting up Core Data with iCloud");
    [MagicalRecord setupCoreDataStackWithiCloudContainer:containerID
                                          contentNameKey:[self iCloudContentNameKey]                // Must not contain dots
                                         localStoreNamed:[self localStoreName]
                                 cloudStorePathComponent:@"Documents/CloudLogs"     // Subpath within your ubiquitous container that will contain db change logs
                                              completion:^{
                                                  // This gets executed after all the setup steps are performed
                                                  // Uncomment the following lines to verify
                                                  NSLog(@"%@", [MagicalRecord currentStack]);
                                                  // NSLog(@"%i events", [Event countOfEntities]);
                                              }];
}

使用上面的代码正确设置 Core Data 和 iCloud。除了一些通知处理程序外，我还可以在本地向核心数据添加记录，并且这些更改会通过 iCloud 传播到其他设备。

在测试期间，最好以编程方式重置所有内容。这是我一直在尝试根据 Apple Docs 重置 CoreData/iCloud 的例程：https://developer.apple.com/library/ios/documentation/DataManagement/Conceptual/UsingCoreDataWithiCloudPG/UsingSQLiteStoragewithiCloud/UsingSQLiteStoragewithiCloud.html#//apple_ref/doc/uid/TP40013491-CH3-SW33

 - (bool) resetCoreDataWithiCloud {


        NSString *containerID = [self iCloudContainerID];
        NSURL *cloudURL = [NSPersistentStore MR_cloudURLForUbiqutiousContainer:containerID];
        NSString *contentNameKey = [self iCloudContentNameKey];
        NSDictionary *options = @{contentNameKey:NSPersistentStoreUbiquitousContentNameKey,cloudURL:NSPersistentStoreUbiquitousContentURLKey};
        NSURL *storeURL = [NSPersistentStore MR_urlForStoreName:[self localStoreName]];
//        NSURL *storeURL = [NSPersistentStore MR_urlForStoreName:[MagicalRecord defaultStoreName];
    //    [MagicalRecord cleanUp];
        DDLogiCloud(@"Resetting CoreData and iCloud named %@ at %@",containerID,storeURL);
        NSError *error;
        bool removeResult = [NSPersistentStoreCoordinator removeUbiquitousContentAndPersistentStoreAtURL:storeURL options:options error:&error];
        if (removeResult == NO) {
            DDLogError(@"Could not remove iCloud Container. Reason: %@", error.localizedFailureReason);
        }
        return removeResult;
    }

无论我尝试什么，对 removeUbiquitous... 的调用都会引发“必须传入商店名称”的错误。

任何有关这方面的指导都会有所帮助！

【问题讨论】：

标签： ios core-data icloud magicalrecord

【解决方案1】：

我认为你有一个错字，options 字典中的键和值在 resetCoreDataWithiCloud 被交换。

在任何情况下，storeOptions 应该与您最初用于设置商店的相同，因此如果可能的话，最好从现有商店中挑选它们，即：

// Get current store options
NSPersistentStore *store = [NSPersistentStore MR_defaultPersistentStore];
NSURL *storeURL = store.URL;
NSDictionary *storeOptions = store.options;

// Destroy CoreData stack
[MagicalRecord cleanUp];

// Delete the store
NSError *error;
BOOL isDeletedFromiCloud = [NSPersistentStoreCoordinator removeUbiquitousContentAndPersistentStoreAtURL:storeURL options:storeOptions error:&error];

// Handle errors
if(isDeletedFromiCloud) {
    NSLog(@"Deleted iCloud persistent store.");
}
else
{
    NSLog(@"Cannot delete iCloud persistent store. Error: %@", error);
}

实际上removeUbiquitousContentAndPersistentStoreAtURL 可能需要一段时间，所以最好从后台调用。如果您只需要它进行开发，那么从主线程也可以。

【讨论】：