Data from Plist is Incorrectly Ordered in UITableView

问题

I have data that is stored in a plist but when I pull it to my UITableView it gets reordered for some reason. Here are my table view data source methods:

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    return [self.lunch_Dinner count];
}

- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section
{
    return [[self.lunch_Dinner allKeys] objectAtIndex:section];
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    NSString *typeOfEntree = [self tableView:tableView titleForHeaderInSection:section];
    return [[self.lunch_Dinner valueForKey:typeOfEntree] count];
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *CellIdentifier = @"EntreeCell";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
    }

    // Configure the cell...
    NSString *typeOfEntree = [self tableView:tableView titleForHeaderInSection:indexPath.section];
    NSString *entree = [[self.lunch_Dinner valueForKey:typeOfEntree] objectAtIndex:indexPath.row];

    cell.textLabel.text = entree;

    return cell;
}

Here is the order of the plist:

Appetizers
Soups
Pastas
Pizzas
Specials

And this is the resulting order in the UITableView after being compiled:

Pizzas
Soups
Appetizers
Pastas
Specials

Any help would be great! Thanks in advance.

回答1:

If you want to store table in plist it is better to consider the following structure:

NSArray *sections = [NSArray arrayWithObjects:
    [NSDictionary dictionaryWithObject:
        [NSArray arrayWithObjects:row_1, row_2, ... , nil] 
            forKey:@"section name 1"],
    [NSDictionary dictionaryWithObject:
        [NSArray arrayWithObjects:row_1, row_2, ... , nil] 
            forKey:@"section name 2"],
    ...
    [NSDictionary dictionaryWithObject:
        [NSArray arrayWithObjects:row_1, row_2, ... , nil] 
            forKey:@"section name N"], 
    nil];

This code representation is easy to reproduce as plist. Create it as in example below

This structure can be easily used as UITableView datasource

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    return [self.datasource count];
}

- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section
{
    NSDictionary *dict = [self.datasource objectAtIndex:section];
    return [dict.allKeys lastObject];
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    NSDictionary *dict = [self.datasource objectAtIndex:section];
    return [dict.allValues.lastObject count];
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    NSDictionary *dict = [self.datasource objectAtIndex:indexPath.section];
    id cellPresenter = [dict.allValues.lastObject objectAtIndex:indexPath.row];
    ...
}

回答2:

It looks like lunch_Dinner is a NSDictionary. NSDictionarys are unordered, so you are not guaranteed a specific output order from them.

It is a little hard to see exactly what value you're getting from having a key/value pair here, but one option would be to keep a separate NSArray with the correct ordering, and use that to correctly populate things.

来源：https://stackoverflow.com/questions/11892598/data-from-plist-is-incorrectly-ordered-in-uitableview

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