iOS 高效的分页加载(TableView、CollectionView)

1、tableview的分页加载的代码对比

没有优化以前的代码以下性能

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

优化以后的代码优化

        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];

 

 

2、collectonview的分页加载的代码对比

没有优化以前的代码以下:spa

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

优化以后的代码code

        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];

总结:相比较之下,优化以后看似代码量增长了少量,可是从理论上分页加载的性能更好了。以前分页加载使用的全局刷新,优化以后改用了局部刷新。从而性能获得提高。blog

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