UITableView 没有重新加载

Question

情况如下：

我有一个“UITableViewController”，它使用 RestKits“RKFetchedResultsTableController”加载对象。单击一个单元格后，我切换到一个详细的 UITableViewController，它也由“RKFetchedResultsTableController”驱动，它为我提供了所选对象的相应答案文本。

现在的问题是，如果我回到第一个“UITableViewController”并在表中选择另一个对象，则先前选择的对象中的旧答案文本位于详细信息表中。如果我使用“pullToRefresh”函数，表格会被刷新并且正确的答案正在加载。

即使我在 viewWillAppear 方法中告诉 [tableController loadTable]，为什么上一个对象的旧答案仍在 tableView 中，而不是新选定对象的正确答案。

Answer 1

AppDelegate：

@

interface AppDelegate ()
@property (nonatomic, strong, readwrite) RKObjectManager *objectManager;
@property (nonatomic, strong, readwrite) RKManagedObjectStore *objectStore;
@end;

@implementation AppDelegate

@synthesize window = _window, isAuthenticated;
@synthesize objectManager;
@synthesize objectStore;

- (void)initializeRestKit
{
    //self.objectManager = [RKObjectManager managerWithBaseURLString:@"http://falling-ocean-1302.herokuapp.com"];
    self.objectManager = [RKObjectManager managerWithBaseURLString:@"http://falling-ocean-1302.herokuapp.com"];
    self.objectManager.serializationMIMEType = RKMIMETypeJSON;
    self.objectManager.acceptMIMEType = RKMIMETypeJSON; 
    self.objectStore = [RKManagedObjectStore objectStoreWithStoreFilename:@"MMmtvzme.sqlite"];
    self.objectManager.objectStore = self.objectStore;
    self.objectManager.mappingProvider = [MMMappingProvider mappingProviderWithObjectStore:self.objectStore];
    self.objectManager.client.cachePolicy = RKRequestCachePolicyNone;

    RKLogConfigureByName("RestKit", RKLogLevelTrace); 
    RKLogConfigureByName("RestKit/Network", RKLogLevelTrace); 
    RKLogConfigureByName("RestKit/ObjectMapping", RKLogLevelTrace); 
    RKLogConfigureByName("RestKit/Network/Queue", RKLogLevelTrace);


    // Enable automatic network activity indicator management
    objectManager.client.requestQueue.showsNetworkActivityIndicatorWhenBusy = YES;

    [objectManager.router routeClass:[MMRequest class] toResourcePath:@"/requests" forMethod:RKRequestMethodPOST];
    [objectManager.router routeClass:[MMRequest class] toResourcePath:@"/requests" forMethod:RKRequestMethodDELETE];

    [objectManager.router routeClass:[MMAnswer class] toResourcePath:@"/requests/:request_id/answers" forMethod:RKRequestMethodPOST];
}

好的，这是第一个 UITableViewController 的代码

    @interface MMMyRequestList ()
    @property (nonatomic, strong) RKFetchedResultsTableController *tableController;
    @end

    @implementation MMMyRequestList

    @synthesize tableController;




- (void)viewDidLoad
    {
        [super viewDidLoad];

        [self configureRKTableController];
        [self configureCellMapping];
        [self useCustomNib];

    }

    - (void)configureRKTableController{
        self.tableController = [[RKObjectManager sharedManager] fetchedResultsTableControllerForTableViewController:self];
        self.tableController.autoRefreshFromNetwork = YES;
        self.tableController.pullToRefreshEnabled = YES;
        self.tableController.resourcePath = @"/requests";
        self.tableController.variableHeightRows = YES;
        NSSortDescriptor *descriptor = [NSSortDescriptor sortDescriptorWithKey:@"request_id" ascending:NO];
        self.tableController.sortDescriptors = [NSArray arrayWithObject:descriptor];
        tableController.canEditRows = YES;      
    }


    - (void)configureCellMapping{
        RKTableViewCellMapping *cellMapping = [RKTableViewCellMapping cellMapping];
        cellMapping.cellClassName = @"MMRequestCell";
        cellMapping.reuseIdentifier = @"MMRequest";
        cellMapping.rowHeight = 100.0;
        [cellMapping mapKeyPath:@"title" toAttribute:@"requestLabel.text"];
        [cellMapping mapKeyPath:@"user.first_name" toAttribute:@"userLabel.text"];

        cellMapping.onSelectCellForObjectAtIndexPath = ^(UITableViewCell *cell, id object, NSIndexPath* indexPath) 
        {
            MMMyRequestListAnswer * uic = [self.storyboard instantiateViewControllerWithIdentifier:@"MMMyRequestListAnswer"];
            MMRequest *request = [self.tableController objectForRowAtIndexPath:indexPath];
            if ([uic respondsToSelector:@selector(setRequest:)]) {
                [uic setRequest:request];
            }
            [self.navigationController pushViewController:uic animated:YES];
        };


        [tableController mapObjectsWithClass:[MMRequest class] toTableCellsWithMapping:cellMapping];
    }

    - (void)useCustomNib{
        [self.tableView registerNib:[UINib nibWithNibName:@"MMRequestCell" bundle:nil] forCellReuseIdentifier:@"MMRequest"];
    }

    - (void)objectLoader:(RKObjectLoader*)objectLoader didFailWithError:(NSError*)error {
        UIAlertView* alert = [[UIAlertView alloc] initWithTitle:@"Error" 
                                                        message:[error localizedDescription] 
                                                       delegate:nil 
                                              cancelButtonTitle:@"OK" otherButtonTitles:nil];

        [alert show];
        NSLog(@"Hit error: %@", error);
    }

    - (void)viewWillAppear:(BOOL)animated {
        [super viewWillAppear:animated];

        /**
         Load the table view!
         */
        [tableController loadTable];

    }

点击一个单元格后，Detail UIViewController 开始行动

    interface MMMyRequestListAnswer ()
    @property (nonatomic, strong) RKFetchedResultsTableController *tableController;

    @end

    @implementation MMMyRequestListAnswer
    @synthesize tableHeaderView, requestTextLabel;
    @synthesize request;
    @synthesize tableController;



 - (void)viewDidLoad
    {
        [super viewDidLoad];

        [self configureRKTableController];
        [self configureCellMapping];
        [self useCustomNib];
    }


    - (void)configureRKTableController{
        self.tableController = [[RKObjectManager sharedManager] fetchedResultsTableControllerForTableViewController:self];
        self.tableController.autoRefreshFromNetwork = YES;
        self.tableController.pullToRefreshEnabled = YES;
        self.tableController.resourcePath = [NSString stringWithFormat:@"/requests/%i/answers", [self.request.request_id intValue]];
        self.tableController.variableHeightRows = YES;
        NSSortDescriptor *descriptor = [NSSortDescriptor sortDescriptorWithKey:@"answer_id" ascending:NO];
        self.tableController.sortDescriptors = [NSArray arrayWithObject:descriptor];
    }


    - (void)configureCellMapping{
        RKTableViewCellMapping *cellMapping = [RKTableViewCellMapping cellMapping];
        cellMapping.cellClassName = @"MMRequestAnswerCell";
        cellMapping.reuseIdentifier = @"MMAnswer";
        cellMapping.rowHeight = 80.0;
        [cellMapping mapKeyPath:@"text" toAttribute:@"answerLabel.text"];
        [cellMapping mapKeyPath:@"user.first_name" toAttribute:@"userLabel.text"];
        [tableController mapObjectsWithClass:[MMAnswer class] toTableCellsWithMapping:cellMapping];
    }

    - (void)useCustomNib{
        [self.tableView registerNib:[UINib nibWithNibName:@"MMRequestAnswerCell" bundle:nil] forCellReuseIdentifier:@"MMAnswer"];
    }

    - (void)viewWillAppear:(BOOL)animated {
        [super viewWillAppear:animated];

        /**
         Load the table view!
         */
        [tableController loadTable];  

    }

对象映射在这个类中处理：

@implementation MMMappingProvider

@synthesize objectStore;

+ (id)mappingProviderWithObjectStore:(RKManagedObjectStore *)objectStore {
    return [[self alloc] initWithObjectStore:objectStore];    
}

- (id)initWithObjectStore:(RKManagedObjectStore *)theObjectStore {
    self = [super init];
    if (self) {
        self.objectStore = theObjectStore;

        [self setObjectMapping:[self requestObjectMapping] forResourcePathPattern:@"/requests" withFetchRequestBlock:^NSFetchRequest *(NSString *resourcePath) {
            NSFetchRequest *fetchRequest = [MMRequest fetchRequest];
            return fetchRequest;
        }];

        [self setObjectMapping:[self answerObjectMapping] forResourcePathPattern:@"/requests/:request_id/answers" withFetchRequestBlock:^NSFetchRequest *(NSString *resourcePath) {
            NSFetchRequest *fetchRequest = [MMAnswer fetchRequest];
            fetchRequest.sortDescriptors = [NSArray arrayWithObject:[NSSortDescriptor sortDescriptorWithKey:@"answer_id" ascending:YES]];
            return fetchRequest;
        }];

        [self setSerializationMapping:[self.requestObjectMapping inverseMapping] forClass:[MMRequest class]];
        [self setSerializationMapping:[self.answerObjectMapping inverseMapping] forClass:[MMAnswer class]];
        [self setSerializationMapping:[self.userObjectMapping inverseMapping] forClass:[MMUser class]];

}

    return self;
}


- (RKManagedObjectMapping *)userObjectMapping {
    RKManagedObjectMapping *mapping =  [RKManagedObjectMapping mappingForEntityWithName:@"MMUser" inManagedObjectStore:self.objectStore];
    mapping.primaryKeyAttribute = @"user_id";

    [mapping mapAttributes:@"first_name", nil];
    [mapping mapKeyPathsToAttributes:
     @"id", @"user_id",
     nil];

    return mapping;
}

- (RKManagedObjectMapping *)answerObjectMapping {
    RKManagedObjectMapping *mapping = [RKManagedObjectMapping mappingForEntityWithName:@"MMAnswer" inManagedObjectStore:self.objectStore];
    mapping.primaryKeyAttribute = @"answer_id";

    [mapping mapAttributes:@"text",@"request_id",@"user_id", nil];
    [mapping mapKeyPathsToAttributes:
     @"id", @"answer_id",
     nil];

    [mapping mapKeyPath:@"user" toRelationship:@"user" withMapping:[self userObjectMapping]];
    [mapping mapKeyPath:@"request" toRelationship:@"request" withMapping:[self requestObjectMapping]];

    return mapping;
}

- (RKManagedObjectMapping *)requestObjectMapping {
    RKManagedObjectMapping *mapping = [RKManagedObjectMapping mappingForEntityWithName:@"MMRequest" inManagedObjectStore:self.objectStore];

    mapping.primaryKeyAttribute = @"request_id";

    [mapping mapAttributes:@"title",@"user_id", nil];
    [mapping mapKeyPathsToAttributes:
     @"id", @"request_id",
     nil];

    [mapping mapKeyPath:@"user" toRelationship:@"user" withMapping:[self userObjectMapping]];

    return mapping;    
}

Answer 2

好的，想通了！！！一些挖掘显示我在映射提供程序之前加载了我的 UITableviewcontroller。

修复方法是，在 - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions 中采用 [self initialiserestkit] 方法

并将其放在此方法中的任何代码之前（即，将 [self initialiserestkit] 设为 didfinishlaunchingwithoptions 方法的第一行。

问题已解决。现在表格视图在映射之后加载，所以一切正常。