Infinity scrolling for Loading More items on UITableView with build-in Pull-to-Refresh functionality.

I've getting tyred of adding load more and pull-to-refresh functionality to every project that I'm working on. So I decided to move my code to one single class with 2 nice blocks that will handle loading and refreshing items in the tableview. Also this will help me to stop implementing table's datasource and delegate in single UIViewController subclass.

Screenshots

Usage

1. Subclass DZLoadMore class
2. Implement -(NSArray *)items method. You should return your UITableView's model items array on this method.

3. Add UITableView data source protocol methods as below:

   - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
       UITableViewCell *cell = [super tableView:tableView cellForRowAtIndexPath:indexPath];
       if (!cell) {
           // Your tableView:cellForRowAtIndexPath: implementation
       }
       ...
   }
   - (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {
       CGFloat height = [super tableView:tableView heightForRowAtIndexPath:indexPath];
       if (height == NSNotFound) {
           // Your tableView:heightForRowAtIndexPath: implementation
       }
       return height;
   }

4. In your ViewController subclass: setup and set your UITableView's dataSource property with your newly created class's object.

   self.dataSource = [[MyDataSource alloc] init];
   self.tableView.dataSource = self.dataSource;

5. If you need load more functionality: set loadMoreItemsBlock property for your dataSource.

   __weak typeof(self) weakSelf = self;
   self.dataSource.loadMoreItemsBlock = ^(id lastItem, BOOLCallback block) {
       MyObject *object = (MyObject *)lastItem;
       // Asyncronously load new items from your backend. You should provide fininsh block that should have BOOL value indicating if server doesn't have any more items to load
       [weakSelf loadItemsFromItem:object finishBlock:^(BOOL noMoreItems) {
           block(noMoreItems); // You should invoke this block after you've updated your dataSource with new values
           [weakSelf.tableView reloadData];
       }];
   };

6. If you need pull-to-refresh functionality: set refreshContentBlock property for your dataSource and setup your UITableViewController's refreshControl property with your dataSource as target and -refreshContent selector.

   self.refreshControl = [[UIRefreshControl alloc] init];
   [self.refreshControl addTarget:self.dataSource action:@selector(refreshContent) forControlEvents:UIControlEventValueChanged];
   __weak typeof(self) weakSelf = self;
   self.dataSource.refreshContentBlock = ^(BOOLCallback block) {
       // Asyncronously load new items from your backend. You should provide fininsh block that should have BOOL value indicating if server doesn't have any more items to load
       [weakSelf loadItemsFromItem:nil finishBlock:^(BOOL noMoreItems) {
           [weakSelf.refreshControl endRefreshing]; // Your UITableViewController responsible for invoking -endRefreshing method or UIRefreshControl
           block(noMoreItems); // You should invoke this block after you've updated your dataSource with new values
           [weakSelf.tableView reloadData];
       }];
   };

Installation

pod 'DZLoadMore'

License

MIT