ios - Objective-C : My UITableView doesn't see new data

Question

我有我的 TableView 的数据源，它很难处理 block 和其他东西。我完全搞砸了(((请帮帮我，我做错了什么？

我的数据源代码:

@synthesize dataItems;


+ (instancetype)sharedDataStorage
{
    static BGMDataStorage *sharedDataStorage = nil;    
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        sharedDataStorage = [[self alloc] initPrivate];
    });

    return sharedDataStorage;
}

- (instancetype)initPrivate
{
    self = [super init];

    if (self)
    {
        // !!!! TEST ARRAY
        NSDictionary *preLoadDict = @{
                                      @"Val 1" : @"34",
                                      @"Val 2" : @"69",
                                      };

        dataItems = [[NSArray alloc] initWithObjects:preLoadDict, nil];
    }

    return self;
}


- (void)buildDataSourcesFor:(NSString *)soapMethodName            
                     OnDate:(NSDate *)date
                 WithParams:(NSString *)param                     
             WithCompletion:(void (^)(NSString *))compblock       
                    failure:(void (^)(NSError *error))failure     
{
    [[BGMSbrDataProvider alloc] callWebServiceFor:soapMethodName
                                           OnDate:date
                                      WithSuccess:^(NSDictionary *resultDict) {

                                                    //success block
                                                    dataItems = [resultDict objectForKey:param];        

                                                    if (dataItems)
                                                    {
                                                        dispatch_async(dispatch_get_main_queue(), ^{
                                                            [[NSNotificationCenter defaultCenter] postNotificationName:@"DataItemsArrayWasBuilt" 
                                                                                                                object:nil];
                                                        });
                                                    }

                                                    NSString *stringData = [self chartDataJsonStringFromArray:dataItems         
                                                                                                forMethodName:soapMethodName];

                                                    compblock(stringData);

                                                }

                                                ...


}

UITableView 代码没有什么特别之处:

//get the number of rows
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{

    //return the number of rows in the section
    return [[[BGMDataStorage sharedDataStorage] dataItems] count];

}


//configure the cell
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{

    //our cell
    //set the CellIdentifier depends on amount of columns
    NSArray *allKeys = [[[[BGMDataStorage sharedDataStorage] dataItems] objectAtIndex:0] allKeys];
    NSUInteger myUnitKeysCounter = [allKeys count];

    NSString *theCellIdentifier = [NSString stringWithFormat:@"ListPrototypeCell%hu", (unsigned short)myUnitKeysCounter];
    DDLogVerbose(@"The current CellIdentifier is: %@.", theCellIdentifier);

    BGMDataTableViewCell *theCell = [self.tableView dequeueReusableCellWithIdentifier:theCellIdentifier forIndexPath:indexPath];

    //configure the cell...
    if ([theCellIdentifier isEqualToString:@"ListPrototypeCell1"])
    {

        theCell.labelText1.text = [[[[BGMDataStorage sharedDataStorage] dataItems] objectAtIndex:indexPath.row] objectForKey:[allKeys objectAtIndex:0]];

    }
    else if ([theCellIdentifier isEqualToString:@"ListPrototypeCell2"])
    {

        theCell.labelText1.text = [[[[BGMDataStorage sharedDataStorage] dataItems] objectAtIndex:indexPath.row] objectForKey:[allKeys objectAtIndex:0]];
        theCell.labelText2.text = [[[[BGMDataStorage sharedDataStorage] dataItems] objectAtIndex:indexPath.row] objectForKey:[allKeys objectAtIndex:1]];

    }

我在调试中看到在 buildDataSourcesFor: 时我在 dataItems 中有数据，但在此之后我在 uitableview 中只看到 TEST ARRAY 数据。我想也许我迷路了，但无论如何我走得太远了。所以我的问题是我在 dataItems = [resultDict objectForKey:param]; 的断点处看到有 24 个对象的数组；并且在我之后只有 2 个对象返回 [[[BGMDataStorage sharedDataStorage] dataItems] count]。

Answer 1

在重新加载 TableView 之前没有更新数据源(dataItems 数组)，应该在调用[tableView reloadData] 之前更新数据源。否则旧数据将被加载到表中。

试试这个，

在 TableView Controller 中的 viewDidLoad 方法中编写此代码

- (void)viewDidLoad
{
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(receiveDataItemsArrayWasBuiltNotification:) name:@"DataItemsArrayWasBuilt" object:nil];
}



- (void)receiveDataItemsArrayWasBuiltNotification:(NSNotification *)notification
{
    //if ([[notification name] isEqualToString:@"DataItemsArrayWasBuilt"]){         

    [self.tableView reloadData]; 
    //}
}



 - (void)buildDataSourcesFor:(NSString *)soapMethodName            
                 OnDate:(NSDate *)date
             WithParams:(NSString *)param                     
         WithCompletion:(void (^)(NSString *))compblock       
                failure:(void (^)(NSError *error))failure     
{
    [[BGMSbrDataProvider alloc] callWebServiceFor:soapMethodName
                                       OnDate:date
                                  WithSuccess:^(NSDictionary *resultDict) {

                                                //success block
                                                dataItems = [resultDict objectForKey:param];        

                                                if (dataItems)
                                                {

                                                    sharedDataStorage.dataItems = dataItems;// You missed this line
                                                        dispatch_async(dispatch_get_main_queue(), ^{
                                                        [[NSNotificationCenter defaultCenter] postNotificationName:@"DataItemsArrayWasBuilt" 
                                                                                                            object:nil];
                                                    });
                                                }

                                                NSString *stringData = [self chartDataJsonStringFromArray:dataItems         
                                                                                            forMethodName:soapMethodName];

                                                compblock(stringData);

                                            }

                                            ...