UITableView中设置section内行数以及配置cell的方法

文中代码粘贴复制自苹果UITableView的Recipes范例：

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {    return 4;}- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section {    NSString *title = nil;    // Return a title or nil as appropriate for the section.    switch (section) {        case TYPE_SECTION:            title = @"Category";            break;        case INGREDIENTS_SECTION:            title = @"Ingredients";            break;        default:            break;    }    return title;;}- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {    NSInteger rows = 0;        /*     The number of rows depends on the section.     In the case of ingredients, if editing, add a row in editing mode to present an "Add Ingredient" cell. */    switch (section) {        case TYPE_SECTION:        case INSTRUCTIONS_SECTION:            rows = 1;            break;        case INGREDIENTS_SECTION:            rows = [recipe.ingredients count];            if (self.editing) {                rows++;            }            break;default:            break;    }    return rows;}- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {    UITableViewCell *cell = nil;         // For the Ingredients section, if necessary create a new cell and configure it with an additional label for the amount.  Give the cell a different identifier from that used for cells in other sections so that it can be dequeued separately.    if (indexPath.section == INGREDIENTS_SECTION) {NSUInteger ingredientCount = [recipe.ingredients count];        NSInteger row = indexPath.row;        if (indexPath.row < ingredientCount) {            // If the row is within the range of the number of ingredients for the current recipe, then configure the cell to show the ingredient name and amount.static NSString *IngredientsCellIdentifier = @"IngredientsCell";cell = [tableView dequeueReusableCellWithIdentifier:IngredientsCellIdentifier];if (cell == nil) { // Create a cell to display an ingredient.cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:IngredientsCellIdentifier] autorelease];cell.accessoryType = UITableViewCellAccessoryNone;}            Ingredient *ingredient = [ingredients objectAtIndex:row];            cell.textLabel.text = ingredient.name;cell.detailTextLabel.text = ingredient.amount;        } else {            // If the row is outside the range, it's the row that was added to allow insertion (see tableView:numberOfRowsInSection:) so give it an appropriate label.static NSString *AddIngredientCellIdentifier = @"AddIngredientCell";cell = [tableView dequeueReusableCellWithIdentifier:AddIngredientCellIdentifier];if (cell == nil) { // Create a cell to display "Add Ingredient".cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:AddIngredientCellIdentifier] autorelease];cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;}            cell.textLabel.text = @"Add Ingredient";        }    } else {         // If necessary create a new cell and configure it appropriately for the section.  Give the cell a different identifier from that used for cells in the Ingredients section so that it can be dequeued separately.        static NSString *MyIdentifier = @"GenericCell";                cell = [tableView dequeueReusableCellWithIdentifier:MyIdentifier];        if (cell == nil) {            cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:MyIdentifier] autorelease];            cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;        }                NSString *text = nil;                switch (indexPath.section) {            case TYPE_SECTION: // type -- should be selectable -> checkbox                text = [recipe.type valueForKey:@"name"];                cell.accessoryType = UITableViewCellAccessoryNone;                cell.editingAccessoryType = UITableViewCellAccessoryDisclosureIndicator;                break;            case INSTRUCTIONS_SECTION: // instructions                text = @"Instructions";                cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;                cell.editingAccessoryType = UITableViewCellAccessoryNone;                break;            default:                break;        }                cell.textLabel.text = text;    }    return cell;}