Question

页: 1 当用户轮流使用装置时,需要将<条码>[表View reloadData]列入<条码>- 即将外向导向>。重压在我的案件中,数据是同步的。

www.un.org/spanish/ecosoc 我的理解是,再载荷在主线上运行,但焚烧了在我的案件中起作用的ForRowAtIndexPath。

因此,问题是如何把主要read等到<代码>。 UITableView s reloadData end.

Answer 1

如果你要求从Rotateto InterfaceOrientation中重载数据,则需要主线。事实上,国际律师联合会的意见是安全的,只能从主线上处理(如果是出于某种原因,有人会要求从另一条路上重载Data)。

I think there is confusion relating to "asynchronous" as a term. Asynchronous callbacks for UI delegates like willRotateToInterfaceOrientation are called on the main thread. To be asynchronous does not necessarily mean a different thread (though running asynchronously "in parallel" does).

我建议阅读NSRunLoop的 Apple果文件。它是“SOS”运行方式的一个组成部分,是评估方案者必须理解的。

https://developer.apple.com/library/mac/documentation/Cocoa/Conceptual/Multithreading/RunLoopManagement/RunLoopManagement.html

Answer 2

You may use CFRunLoopRun to make your main thread wait until UITableView data is reloaded. After data is reloaded call CFRunLoopStop passing result of CFRunLoopGetMain as parameter.

Answer 3

You ll need to load your table s data in the background, then call UITableView s reloadData method.

您可以利用德国航天中心轻松地向背景点派遣负荷工作。完成这项任务时,该工人已经向主人发回一个叫<代码>的栏目。在这方面:

- (void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration{

  ...
  dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
  dispatch_async(queue, ^{

     // load your table data here
     [self loadMyTableData];

     // when done dispatch back to the main queue to load the table
     dispatch_queue_t mainQueue = dispatch_get_main_queue();
     dispatch_async(mainQueue, ^{

        [self.tableView reloadData];
      });
  });
  ...
}

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