objective-c : count items

snippet.m

//count items and update table views lable

//loops through the ChecklistItem objects from the items array 
//If the item object has its checked property set to NO, increment the local variable count by 1
//When looked at all the objects, return the value of this count to the caller

//Checklist.h
- (int)countUncheckedItems;

//Checklist.m
#import "ChecklistItem.h"

- (int)countUncheckedItems {
	int count = 0;
	for (ChecklistItem *item in self.items) {
		if (!item.checked) { 
			count += 1;
		} 
	}
	return count; 
}


//call method

//AllListsViewController.m
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
	
	static NSString *CellIdentifier = @"Cell";
	UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
	
	if (cell == nil) {
		cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier];
	}

	Checklist *checklist = self.dataModel.lists[indexPath.row];
	cell.textLabel.text = checklist.name; 
	cell.accessoryType = UITableViewCellAccessoryDetailDisclosureButton;
	
	cell.detailTextLabel.text = [NSString stringWithFormat:@"%d Remaining", [checklist countUncheckedItems]];
	return cell; 
}


//change to-do count and update label
//when user toggles a checkmark on an item, adds a new item or deletes an item
- (void)viewWillAppear:(BOOL)animated {
	[super viewWillAppear:animated]; 
	[self.tableView reloadData];
}

//cellForRowAtIndexPath
int count = [checklist countUncheckedItems]; 
if ([checklist.items count] == 0) {
	cell.detailTextLabel.text = @"(No Items)"; } 
	else if (count == 0) {
		cell.detailTextLabel.text = @"All Done!"; } 
		else {
			cell.detailTextLabel.text = [NSString stringWithFormat:@"%d Remaining", count];
		}