iOS 高效的分页加载（TableView、Collection

一、tableview的分页加载的代码对比

没有优化之前的代码如下

  [strongSelf.tableView.mj_footer endRefreshing]；
 [strongSelf.articleArr addObjectsFromArray:feedList];
  [strongSelf.tableView reloadData];

优化之后的代码

NSMutableArray *indexPaths = [NSMutableArray array];
        [feedList enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
            
            NSIndexPath *indexPath = [NSIndexPath indexPathForRow:(strongSelf.articleArr.count + idx) inSection:0];
            [indexPaths addObject:indexPath];
        }];
        
        [strongSelf.tableView.mj_footer endRefreshing];
        
        [strongSelf.articleArr addObjectsFromArray:feedList];
        
        [strongSelf.tableView beginUpdates];
        [strongSelf.tableView insertRowsAtIndexPaths:indexPaths withRowAnimation:UITableViewRowAnimationNone];
        [strongSelf.tableView endUpdates];

二、collectonview的分页加载的代码对比

没有优化之前的代码如下：

[strongSelf.feedList addObjectsFromArray:feedList];
        if (feedList.count < kPageSize) {
            
            [strongSelf.collectionView.mj_footer endRefreshingWithNoMoreData];
        }else{
            
            [strongSelf.collectionView.mj_footer resetNoMoreData];
        }
        [strongSelf.collectionView  reloadData];

优化之后的代码

        NSMutableArray *indexPaths = [NSMutableArray array];
        [feedList enumerateObjectsUsingBlock:^(id  _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
            
            [indexPaths addObject:[NSIndexPath indexPathForItem:(strongSelf.feedList.count + idx) inSection:0]];
        }];
        
        [strongSelf.feedList addObjectsFromArray:feedList];
        if (feedList.count < kPageSize) {
            
            [strongSelf.collectionView.mj_footer endRefreshingWithNoMoreData];
        }else{
            
            [strongSelf.collectionView.mj_footer resetNoMoreData];
        }
        [strongSelf.collectionView insertItemsAtIndexPaths:indexPaths];