ios - 在 Restkit 0.2 中加载具有相同实体和不同谓词的两个不同表时遇到问题
<p><p>这是我正在尝试做的简化版本:</p>
<p>我有一个使用 UITabBarController 作为根 Controller 的应用程序。
在两个选项卡中，我有一个 UINavigationController，其中包含一个自定义 UITableViewController。</p>
<p>其中一个表格 View 用于显示“特色”项目，另一个用于显示“用户”项目。</p>
<p>第一个 API 端点是:/api/items/featured
另一个端点是:/api/items/user</p>
<p>我在我的 AppDelegate.m 中完成了设置所有内容的整个过程:</p>
<pre><code>// Configure the object manager
RKObjectManager *objectManager = ];
objectManager.managedObjectStore = managedObjectStore;
;
RKEntityMapping *entityMapping = ;
[entityMapping addAttributeMappingsFromDictionary:@{
@"id": @"itemID",
@"type": @"type",
@"created_at": @"created_at":
@"field1": @"field1"}];
// User Descriptor
RKResponseDescriptor *userDescriptor = ;
;
// Featured Listing Decriptor
RKResponseDescriptor *featuredDescriptor = ;
;
</code></pre>
<p>然后在 TableViewControls 中我有以下内容(在第二个 tableviewController 中用 'user' 代替 'featured')</p>
<pre><code>- (void)viewDidLoad {
;
// Do any additional setup after loading the view, typically from a nib.
;
}
- (void)loadItems {
[ getObjectsAtPath:@"/api/items/featured" parameters:nil
success:^(RKObjectRequestOperation *operation, RKMappingResult *mappingResult) {
self.lastupdate = [ init];
}
failure:^(RKObjectRequestOperation *operation, NSError *error) {
UIAlertView *alertView = [ initWithTitle:@"An Error Has Occurred" message: delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
;
}];
}
- (NSFetchedResultsController *)fetchedResultsController {
if (_fetchedResultsController != nil) {
return _fetchedResultsController;
}
RKManagedObjectStore *managedObjectStore = ;
self.managedObjectContext = managedObjectStore.mainQueueManagedObjectContext;
NSFetchRequest *fetchRequest = [ init];
// Edit the entity name as appropriate.
NSEntityDescription *entity = ;
;
// Set the batch size to a suitable number.
;
// Edit the sort key as appropriate.
NSSortDescriptor *sortDescriptor = [ initWithKey:@"created_at" ascending:NO];
NSArray *sortDescriptors = @;
;
// Set predicate to only get Featured Listings
NSPredicate *predicate = ;
;
// Edit the section name key path and cache name if appropriate.
// nil for section name key path means "no sections".
NSFetchedResultsController *aFetchedResultsController = [ initWithFetchRequest:fetchRequest managedObjectContext:self.managedObjectContext sectionNameKeyPath:nil cacheName:@"Master"];
aFetchedResultsController.delegate = self;
self.fetchedResultsController = aFetchedResultsController;
NSError *error = nil;
if (!) {
// Replace this implementation with code to handle the error appropriately.
// abort() causes the application to generate a crash log and terminate. You should not use this function in a shipping application, although it may be useful during development.
NSLog(@"Unresolved error %@, %@", error, );
abort();
}
return _fetchedResultsController;
}
</code></pre>
<p>现在这一切都适用于第一个选项卡(目前它返回 8 个项目，type = 'featured'，显示在表格中)。</p>
<p>当我切换到第二个标签时，问题就来了。它目前只返回 1 个 type='user' 的项目，并崩溃:</p>
<blockquote>
<p>CoreData: error: Serious application error.Exception was caught during Core Data change processing.This is usually a bug within an observer of NSManagedObjectContextObjectsDidChangeNotification.<em>*</em> -: index 3 beyond bounds for empty array with userInfo (null)</p>
</blockquote>
<p>如果我在“用户”选项卡上省略谓词，则“特色”选项卡可以正常工作，“用户”选项卡会在其表中获取“特色”项目，而“用户”项目在顶部。</p>
<p>由于两个 tableview 控件的代码是相同的，除了“用户”和“功能”，我不知道问题出在哪里。</p></p>
<br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
<p><p>当您创建和配置获取的结果 Controller 时，不要使用缓存。目前他们都在使用 <code>@"Master"</code> 的缓存，这将导致他们尝试共享不合适的信息，因为获取请求不同。</p></p>
<p style="font-size: 20px;">关于ios - 在 Restkit 0.2 中加载具有相同实体和不同谓词的两个不同表时遇到问题，我们在Stack Overflow上找到一个类似的问题：
<a href="https://stackoverflow.com/questions/15890674/" rel="noreferrer noopener nofollow" style="color: red;">
https://stackoverflow.com/questions/15890674/
</a>
</p>
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