ios - RestKit:如何批处理多个请求并在完成后获得响应？

Question

我刚刚发现了 RestKit，它将成为我正在开发的应用程序的重要组成部分。当时，我能够将其与核心数据集成，但还没有想出发送多个 GET 请求的最佳方式。

我需要做的是:

从以下地址获取数据:

http://url.com/api/banner/
http://url.com/api/category/
http://url.com/api/link/

URL 将始终采用以下格式:http://url.com/api/SOMETHING/

一旦所有请求 完成，我想运行一段代码(例如调用一个新的 View Controller )。执行此操作的最佳方法是什么？

目前，这是我正在使用的代码:

- (id)init
{
    self = [super init];
    if (self) {
        [self setupConnector];
        [self setupDatabase];
        [self setupMappings];
        [self sendRequests];
    }

    return self;
}

- (void)setupConnector
{
    // Initialize RestKIT
    RKObjectManager *objectManager = [RKObjectManager managerWithBaseURL:[NSURL URLWithString:@"http://baseURL"]];
    self.managedObjectStore = [[RKManagedObjectStore alloc] initWithManagedObjectModel:[[NLCoreData shared] managedObjectModel]];
    objectManager.managedObjectStore = self.managedObjectStore;
}

- (void)setupDatabase
{
    NSString *storePath = [[NLCoreData shared] storePath];
    NSError *error = nil;
    NSPersistentStore *persistentStore = [self.managedObjectStore addSQLitePersistentStoreAtPath:storePath fromSeedDatabaseAtPath:nil withConfiguration:nil options:nil error:&error];
    NSAssert(persistentStore, @"Failed to add persistent store with error: %@", error);

    [self.managedObjectStore createManagedObjectContexts];

    self.managedObjectStore.managedObjectCache = [[RKInMemoryManagedObjectCache alloc] initWithManagedObjectContext:self.managedObjectStore.persistentStoreManagedObjectContext];
}

- (void)setupMappings
{
    RKObjectManager *objectManager = [RKObjectManager sharedManager];

    // Mappings

    // banner
    RKEntityMapping *bannerMapping = [RKEntityMapping mappingForEntityForName:@"Banner" inManagedObjectStore:self.managedObjectStore];
    [bannerMapping addAttributeMappingsFromDictionary:@{
     @"title": @"title",
     @"id": @"bannerID",
     @"created_at": @"created_at",
     @"image": @"image",
     @"resource_uri": @"resource_uri",
     @"updated_at": @"updated_at",
     @"url": @"url"
     }];
    bannerMapping.identificationAttributes = @[ @"bannerID" ];

    RKResponseDescriptor *bannerDescriptor = [RKResponseDescriptor responseDescriptorWithMapping:bannerMapping
                                                                                        pathPattern:@"/api/v1/banner/"
                                                                                            keyPath:@"objects"
                                                                                        statusCodes:RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful)];
    [objectManager addResponseDescriptor:bannerDescriptor];

    // category
    RKEntityMapping *categoryMapping = [RKEntityMapping mappingForEntityForName:@"Category" inManagedObjectStore:self.managedObjectStore];
    [categoryMapping addAttributeMappingsFromDictionary:@{
     @"name": @"name",
     @"id": @"categoryID",
     @"created_at": @"created_at",
     @"resource_uri": @"resource_uri",
     @"updated_at": @"updated_at",
     @"active": @"active"
     }];
    categoryMapping.identificationAttributes = @[ @"categoryID" ];

    RKResponseDescriptor *categoryDescriptor = [RKResponseDescriptor responseDescriptorWithMapping:categoryMapping
                                                                                     pathPattern:@"/api/v1/category/"
                                                                                         keyPath:@"objects"
                                                                                     statusCodes:RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful)];
    [objectManager addResponseDescriptor:categoryDescriptor];


}

- (void)sendRequests
{
    RKObjectManager *objectManager = [RKObjectManager sharedManager];

    // Send Request
    [objectManager getObjectsAtPath:@"/api/v1/banner/" parameters:nil success:^(RKObjectRequestOperation * operation, RKMappingResult *mappingResult) {
        NSLog(@"SUCCESS: %@", mappingResult.array);
    } failure: ^(RKObjectRequestOperation * operation, NSError * error) {
        NSLog(@"FAILURE %@", error);
    }];

    // category
    [objectManager getObjectsAtPath:@"/api/v1/category/" parameters:nil success:^(RKObjectRequestOperation * operation, RKMappingResult *mappingResult) {
        NSLog(@"SUCCESS: %@", mappingResult.array);
    } failure: ^(RKObjectRequestOperation * operation, NSError * error) {
        NSLog(@"FAILURE %@", error);
    }];
}

有什么建议吗？

Answer 1

RestKit 的解决方案是这样的:不是使用方便的方法 ObjectManager::getObjectsAtPath 你必须手动初始化所​​有的 RKObjectRequestOperations 然后使用 ObjectManager::enqueueBatchOfObjectRequestOperations:progress:completion:将它们排入队列的方法。

或者，我认为这实际上是更简单、更清洁的解决方案，如对 this question 的已接受答案中所述使用调度组。 .