iPhone + performselector在背景中

Question

任何人都可以帮助我performSelectorInBackground吗？我想在performSelectorInBackground中重新加载包含更新数据的表。

Answer 1

你能做的就是在后台线程中获取数据，一旦获得数据并在主线程中更新tableview，就可以返回主线程。

- (UITableViewCell *)tableView:(UITableView *)tableView 
         cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
   //All your views cell creations and other stuff
   [self performSelectorInBackground:@selector(loadDataThatToBeFetchedInThread:) 
                          withObject:objectArrayThatNeedToFetchData];
}

- (void) loadDataThatToBeFetchedInThread:(NSArray *)objectThatNeedToFetchData
{
    //Fetch the data here. which takes place in background thread
    [self performSelectorOnMainThread:@selector(updateTableViewWithTheData:) 
                           withObject:responseData 
                        waitUntilDone:YES];
}


- (void) updateTableViewWithTheData:(NSMutableArray *)yourData
{
    //Update Data to tableview here
}

Answer 2

所有UI功能都应该在主线程中完成。所以你必须只在主线程中重新加载UITableView。