从 NSOperation 调用时 UITableView 会休眠

发布于 2024-10-14 21:51:28 字数 2347 浏览 4 评论 0原文

我正在编写一个应用程序，每当用户点击重新加载按钮时，它都需要从网站获取其内容。

如果他这样做，一个 NSOperation 就会被注册并放入 NSOperationQueue 中。

当 NSOperation 启动（START QUEUE）时，它会检查其缓存并从服务器重新加载数据（CALL IMPORT1）。
执行此任务后，操作将向我的 UITableView 发送一条通知，该通知查询数据库（开始读取/结束读取），然后调用 [self.tableView reloadData]; (RELOAD DATA START)
直到这里一切都按预期进行。即使我导入大约 1.000 个元素。

让我发疯的是，在“END QUEUE”和获取第一个单元格（CREATE CELL START）之间有某种睡眠。经过这次睡眠后，细胞就会按其应有的速度生成——速度非常快。

我不明白是什么引发了这种“睡眠”。

任何人都可以给我提示出了什么问题吗？

预先感谢 Boris

在 viewDidAppear 中调用

2011-01-29 15:54:34.460 [30488:207] 开始阅读 2011-01-29 15:54:34.461 [30488:207] 阅读结束
2011-01-29 15:54:34.464 [30488:207] 重新加载数据开始 2011-01-29 15:54:34.468 [30488:207] 获取部分 2011-01-29 15:54:34.469 [30488:207] 获取标题 2011-01-29 15:54:34.470 [30488:207] 获取标头 2011-01-29 15:54:34.470 [30488:207] 获取行
2011-01-29 15:54:34.471 [30488:207] 创建单元格开始 2011-01-29 15:54:34.473 [30488:207] 创建单元格停止 2011-01-29 15:54:34.474 [30488:207] 创建单元格启动
2011-01-29 15:54:34.475 [30488:207] 创建单元停止 2011-01-29 15:54:34.476 [30488:207] 创建单元格开始 2011-01-29 15:54:34.477 [30488:207] 创建单元格停止
2011-01-29 15:54:34.477 [30488:207] 获取标题

通过通知调用（粗体部分是新的，因为 NSOperation）

2011-01-29 15:54:04.719 [30488:630b] 启动队列 2011-01-29 15:54:05.727 [30488:630b] 调用导入 1 开始
2011-01-29 15:54:05.750 [30488:630b] 呼叫导入1停止2011-01-29 15:54:05.760 [30488:630b] 通话视图开始 2011-01-29 15:54:05.767 [30488:630b] 开始阅读
2011-01-29 15:54:05.771 [30488:630b] 阅读结束 2011-01-29 15:54:05.781 [30488:630b] 重新加载数据开始
2011-01-29 15:54:05.786 [30488:630b] 获取部分 2011-01-29 15:54:05.791 [30488:630b] 获取标头 2011-01-29 15:54:05.797 [30488:630b] 获取标头
2011-01-29 15:54:05.802 [30488:630b] 获取行
2011-01-29 15:54:05.806 [30488:630b] 呼叫视图停止 2011-01-29 15:54:05.811 [30488:630b] 结束队列 2011-01-29 15:54:10.770 [30488:630b] 创建单元格开始 2011-01-29 15:54:10.776 [30488:630b] 创建单元格停止 2011-01-29 15:54:10.777 [30488:630b] 创建单元格启动
2011-01-29 15:54:10.778 [30488:630b] 创建单元停止 2011-01-29 15:54:10.778 [30488:630b] 创建单元格开始 2011-01-29 15:54:10.780 [30488:630b] 创建单元格停止
2011-01-29 15:54:10.781 [30488:630b] 获取标题

原文

I´m writing an app which needs to get its content from a website whenever the user taps a reload button.

If he does so an NSOperation is registered and put to NSOperationQueue.

When the NSOperation is starting (START QUEUE) it checks its cache and reloads the data from the server (CALL IMPORT1).
After this task the operation sends an Notification to my UITableView which queries the database (START READING / END READING) and then calls [self.tableView reloadData]; (RELOAD DATA START)
Until here everything works as expected. Even if i import about 1.000 elements.

The thing that drives my crazy is that there´s some kind of sleep between "END QUEUE" and getting the first cell (CREATE CELL START). After this sleep the cells are created as they should be - very fast.

I can´t figure out what invokes this "sleep".

Can anybody please give me an hint what´s going wrong.

Thanks in advance Boris

Called within viewDidAppear

2011-01-29 15:54:34.460 [30488:207]
START READING 2011-01-29
15:54:34.461 [30488:207] END READING
2011-01-29 15:54:34.464 [30488:207]
RELOAD DATA START 2011-01-29
15:54:34.468 [30488:207] GET SECTIONS
2011-01-29 15:54:34.469 [30488:207]
GET HEADER 2011-01-29 15:54:34.470
[30488:207] GET HEADER 2011-01-29
15:54:34.470 [30488:207] GET ROWS
2011-01-29 15:54:34.471 [30488:207]
CREATE CELL START 2011-01-29
15:54:34.473 [30488:207] CREATE CELL
STOP 2011-01-29 15:54:34.474
[30488:207] CREATE CELL START
2011-01-29 15:54:34.475 [30488:207]
CREATE CELL STOP 2011-01-29
15:54:34.476 [30488:207] CREATE CELL
START 2011-01-29 15:54:34.477
[30488:207] CREATE CELL STOP
2011-01-29 15:54:34.477 [30488:207]
GET HEADER

Called via Notification (The bold parts are new because of the NSOperation)

2011-01-29 15:54:04.719 [30488:630b] START QUEUE 2011-01-29 15:54:05.727
[30488:630b] CALL IMPORT1 START
2011-01-29 15:54:05.750 [30488:630b]
CALL IMPORT1 STOP 2011-01-29
15:54:05.760 [30488:630b] CALL VIEW
START 2011-01-29 15:54:05.767
[30488:630b] START READING
2011-01-29 15:54:05.771 [30488:630b]
END READING 2011-01-29 15:54:05.781
[30488:630b] RELOAD DATA START
2011-01-29 15:54:05.786 [30488:630b]
GET SECTIONS 2011-01-29 15:54:05.791
[30488:630b] GET HEADER 2011-01-29
15:54:05.797 [30488:630b] GET HEADER
2011-01-29 15:54:05.802 [30488:630b]
GET ROWS
2011-01-29 15:54:05.806 [30488:630b] CALL VIEW STOP 2011-01-29
15:54:05.811 [30488:630b] END QUEUE
2011-01-29 15:54:10.770 [30488:630b]
CREATE CELL START 2011-01-29
15:54:10.776 [30488:630b] CREATE CELL
STOP 2011-01-29 15:54:10.777
[30488:630b] CREATE CELL START
2011-01-29 15:54:10.778 [30488:630b]
CREATE CELL STOP 2011-01-29
15:54:10.778 [30488:630b] CREATE CELL
START 2011-01-29 15:54:10.780
[30488:630b] CREATE CELL STOP
2011-01-29 15:54:10.781 [30488:630b]
GET HEADER