ios - RestKit saveToPersistentStore不起作用

我将RestKit用于我的其余实现。我从服务器获取数据，并接收到数据，然后调用saveToPersistentStore也成功，但是当我关闭Internet并再次加载该页面时，它在存储中找不到任何数据。

这是初始化流程-

NSURL *modelURL = [NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:@"Storage" ofType:@"momd"]];
// NOTE: Due to an iOS 5 bug, the managed object model returned is immutable.
NSManagedObjectModel *managedObjectModel = [[[NSManagedObjectModel alloc] initWithContentsOfURL:modelURL] mutableCopy];
RKManagedObjectStore *managedObjectStore = [[RKManagedObjectStore alloc] initWithManagedObjectModel:managedObjectModel];

// Initialize the Core Data stack
[managedObjectStore createPersistentStoreCoordinator];

NSPersistentStore __unused *persistentStore = [managedObjectStore addInMemoryPersistentStore:&error];
NSAssert(persistentStore, @"Failed to add persistent store: %@", error);

[managedObjectStore createManagedObjectContexts];

// Set the default store shared instance
[RKManagedObjectStore setDefaultStore:managedObjectStore];

我对每一个使用mainQueue-

    controller.managedObjectContext = managedObjectStore.mainQueueManagedObjectContext;

这是执行提取的功能：

[CMLRKSharedManager getNewsForUser:userProfile
                             urlParams:dict
                               success:^(RKObjectRequestOperation *operation, RKMappingResult *mappingResult) {
       [self.tableView reloadData];
       NSLog(@"Fetched object count %lu %@ %@", (unsigned long)self.fetchedResultsController.fetchedObjects.count , self.fetchedResultsController, self.fetchedResultsController.managedObjectContext);
       NSManagedObjectContext *managedObjCtx = [RKManagedObjectStore defaultStore].mainQueueManagedObjectContext;

       NSError *executeError = nil;
       if(![managedObjCtx saveToPersistentStore:&executeError]) {
           NSLog(@"Failed to save to data store");
        }
       else
           NSLog(@"SAVE SUCCESSFUL");
    } failure:^(RKObjectRequestOperation *operation, NSError *error) {
        [self.tableView reloadData];
    }];
}

输出：


  2014-04-02 22：24：01.547获取的对象计数4
  
  2014-04-02 22：24：01.555保存成功


现在，我杀死了该应用程序，关闭了wifi，然后再次启动该应用程序。该表现在为空白，我看到fetchResultsController在控制台日志中看到0个项目


  4月2日22:24:36：在numberOfRows中获取的对象计数0


我不确定为什么...

@wain我将代码更新如下-

NSError *error = nil;
NSURL *modelURL = [NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:@"Cover" ofType:@"momd"]];
// NOTE: Due to an iOS 5 bug, the managed object model returned is immutable.
NSManagedObjectModel *managedObjectModel = [[[NSManagedObjectModel alloc] initWithContentsOfURL:modelURL] mutableCopy];
RKManagedObjectStore *managedObjectStore = [[RKManagedObjectStore alloc] initWithManagedObjectModel:managedObjectModel];

// Initialize the Core Data stack
[managedObjectStore createPersistentStoreCoordinator];

评论了这两行

//    NSPersistentStore __unused *persistentStore = [managedObjectStore addInMemoryPersistentStore:&error];
//    NSAssert(persistentStore, @"Failed to add persistent store: %@", error);
//

而是添加了sqlite数据库，但现在该应用程序崩溃了

BOOL success = RKEnsureDirectoryExistsAtPath(RKApplicationDataDirectory(), &error);
if (! success) {
    RKLogError(@"Failed to create Application Data Directory at path '%@': %@", RKApplicationDataDirectory(), error);
}
NSString *path = [RKApplicationDataDirectory() stringByAppendingPathComponent:@"Store.sqlite"];
NSPersistentStore *persistentStore = [managedObjectStore addSQLitePersistentStoreAtPath:path fromSeedDatabaseAtPath:nil withConfiguration:nil options:nil error:&error];
if (! persistentStore) {
    RKLogError(@"Failed adding persistent store at path '%@': %@", path, error);
}

最佳答案

根据您的描述，问题在于您只有一个内存存储：

[managedObjectStore addInMemoryPersistentStore:&error];

因此什么都不会保存到磁盘。您应该更改此设置，以便使用SQLite存储。这会将数据保存到磁盘，并且在大多数使用情况下通常效果更好。

关于ios - RestKit saveToPersistentStore不起作用，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/22828692/