iOS-LazyTableView

A subclass of the UITableView with an easy lazy loading (infinite scroll) implementation.

How to use

With this UITbaleView subclass, you can implement, in a very easy way, a table view with a lazy loading system when the table view is scrolling down.
To do this you have to implement your UITableView, by using the L3SDKLazyTableView class. You need just to:

• define your table view instance (by code or by IBOutlet) by using L3SDKLazyTableView class
• set the delegate and implement tableView:lazyLoadNextCursor: of L3SDKLazyTableViewDelegate

When the scroll will be at the botton, will be raised the ```tableView:lazyLoadNextCursor:``` event, and inside it you can implement your code to load more data (eg. by adding items to an array, by requesting more data to a remote webservice and so on).
See my example for more detail.

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@property (weak, nonatomic) IBOutlet L3SDKLazyTableView *lazyTableView;
@property (nonatomic,strong)NSMutableArray*dataSource;

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- (void)tableView:(UITableView *)tableView lazyLoadNextCursor:(int)cursor{
    //for instance here you can execute webservice request lo load more data
    [self fetchNewItems];
    [self.lazyTableView reloadData];
}

-(void)fetchNewItems{
    
    //add items to datasource
    NSUInteger count=self.dataSource.count;
    for (int i=0; i<LAZY_LOAD_PAGE_SIZE; i++) {
        [self.dataSource addObject:[NSString stringWithFormat:@"Item - %lu", count+1]];
        count++;
    }
}

Within this project you will can focus around two classes:

• L3SDKLazyTableView

properties

name	type	description
lazyLoadEnabled	BOOL	it allows to enable/disble lazye load
lazyLoadPageSize	int	gets or sets lazy load page size
currentCursor	int	gets last lazy load cursor
delegate	L3SDKLazyTableViewDelegate	gets or sets class delegate

protocols

//UITableViewDelegate extension
@protocol L3SDKLazyTableViewDelegate<UITableViewDelegate>
@optional
//it will be raised when scroll will be at the bottom
- (void)tableView:(UITableView *)tableView lazyLoadNextCursor:(int)cursor;
@end

• L3SDKLazyLoadUtility This class allows to track last item index (cursor) loaded by defining a pagse size (quantity of data to load for each request)

properties

name	type	description
isEnabled	BOOL	it allows to enable/disble lazye load
pageSize	int	gets or sets lazy load page size
currentCursor	int	gets last lazy load cursor

methods

name | type | description -------------- | ----------------|------------------------------------------------------------------- initWithPageSize | id | factory initialization nextCursor | int | asks to move to next cursor resetCursor | void | reset cursor to -1