iphone - 更改数据模型后保存在设备上时崩溃

在过去的四个小时中，我一直在寻找解决方案，而我却绝望地发帖。在向一个数据模型添加属性之前，我的应用在模拟器，iPhone和ipad上均能完美运行。

我的iPhone应用程序使用Core Data和iCloud。在AppDelegate中，我通过合并两个模型来创建managedObjectModel。在尝试保存ManagedObjectContext之前，一切似乎都很好。那是它崩溃的原因:



这不会在模拟器上发生。

我努力了:

项目->清洁构建文件夹

项目->清洁

从我的应用中删除
设备

从我的iCloud备份中删除iCloud数据

重新启动计算机

将“.momd”更改为“.mom”，然后再次返回(在另一个问题中进行了了解)

谢谢您的帮助。

编辑添加代码:

- (NSPersistentStoreCoordinator *)persistentStoreCoordinator {
if (__persistentStoreCoordinator != nil) {
    return __persistentStoreCoordinator;
}

__persistentStoreCoordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel: [self managedObjectModel]];
NSPersistentStoreCoordinator *psc = __persistentStoreCoordinator;

// TODO: Set up iCloud in another thread:
//dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
NSString *dataFileName = [NSString stringWithFormat:@"%@.sqlite", APP_TITLE_NO_SPACES];

NSString *iCloudDataDirectoryName = @"Data.nosync";
NSString *iCloudLogsDirectoryName = @"Logs";
NSFileManager *fileManager = [NSFileManager defaultManager];
NSURL *localStore = [[self applicationDocumentsDirectory] URLByAppendingPathComponent:dataFileName];
NSURL *iCloud = [fileManager URLForUbiquityContainerIdentifier:nil];

if (iCloud) {
    NSURL *iCloudLogsPath = [NSURL fileURLWithPath:[[iCloud path] stringByAppendingPathComponent:iCloudLogsDirectoryName]];
    if([fileManager fileExistsAtPath:[[iCloud path] stringByAppendingPathComponent:iCloudDataDirectoryName]] == NO) {
        NSError *fileSystemError;
        [fileManager createDirectoryAtPath:[[iCloud path] stringByAppendingPathComponent:iCloudDataDirectoryName]
               withIntermediateDirectories:YES
                                attributes:nil
                                     error:&fileSystemError];
        if(fileSystemError != nil) {
            NSLog(@"Error creating database directory %@", fileSystemError);
        }
    }

    NSString *iCloudData = [[[iCloud path]
                             stringByAppendingPathComponent:iCloudDataDirectoryName]
                            stringByAppendingPathComponent:dataFileName];

    NSLog(@"iCloudData = %@", iCloudData);

    NSDictionary* options = [NSDictionary dictionaryWithObjectsAndKeys:
                             [NSNumber numberWithBool:YES], NSMigratePersistentStoresAutomaticallyOption,
                             [NSNumber numberWithBool:YES], NSInferMappingModelAutomaticallyOption,
                             CLOUD_CONTAINER_IDENTIFIER, NSPersistentStoreUbiquitousContentNameKey,
                             iCloudLogsPath, NSPersistentStoreUbiquitousContentURLKey, nil];

    [psc lock];
    [psc addPersistentStoreWithType:NSSQLiteStoreType
                      configuration:nil
                                URL:[NSURL fileURLWithPath:iCloudData]
                            options:options
                              error:nil];
    [psc unlock];
} else {
    NSLog(@"iCloud is NOT working - using a local store");
    NSMutableDictionary *options = [NSMutableDictionary dictionary];
    [options setObject:[NSNumber numberWithBool:YES] forKey:NSMigratePersistentStoresAutomaticallyOption];
    [options setObject:[NSNumber numberWithBool:YES] forKey:NSInferMappingModelAutomaticallyOption];

    [psc lock];

    [psc addPersistentStoreWithType:NSSQLiteStoreType
                      configuration:nil
                                URL:localStore
                            options:options
                              error:nil];
    [psc unlock];
}
__persistentStoreCoordinator = psc;

[[NSNotificationCenter defaultCenter] postNotificationName:NOTIFICATION_ICLOUD_SOMETHING_CHANGED object:nil];

return __persistentStoreCoordinator;

}

最佳答案

通常，删除程序数据后应该可以。但是，错误表明您没有不一致，而根本没有存储。假设:如果发生故障，请勿重新启动它。也许以下代码可能会有用:

- (NSPersistentStoreCoordinator *)persistentStoreCoordinator

{
    if (__persistentStoreCoordinator != nil) {
        return __persistentStoreCoordinator;
    }
    NSURL *storeURL = [[self applicationDocumentsDirectory] URLByAppendingPathComponent:@"myApp.sqlite"];

    NSError *error = nil;
    __persistentStoreCoordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel:[self managedObjectModel]];
    if (![__persistentStoreCoordinator addPersistentStoreWithType:NSSQLiteStoreType configuration:nil URL:storeURL options:nil error:&error]) {
        // Error, erase data
        [[NSFileManager defaultManager] removeItemAtURL:storeURL error:nil];
        NSLog(@"store cleaned");
        __persistentStoreCoordinator = nil;
        return [self persistentStoreCoordinator];
    }
    return __persistentStoreCoordinator;
}