TableView数据没有得到更新与NSOperation
问题描述:
所以我不知道如果我正确地设置它。我有一个SearchDisplayController
和搜索栏。TableView数据没有得到更新与NSOperation
UISearchBar *searchBar = [[UISearchBar alloc] initWithFrame:CGRectMake(0, 0, 150, 44)];
self.SearchEntry = searchBar;
self.SearchEntry.tintColor = DARKGRAY_COLOR;
self.SearchEntry.autoresizingMask = UIViewAutoresizingFlexibleLeftMargin;
self.SearchEntry.delegate = self;
UISearchDisplayController *searchDisplayCtlr = [[UISearchDisplayController alloc] initWithSearchBar:_searchEntry contentsController:self];
self.SearchController = searchDisplayCtlr;
这些进去UIToolbar
。因为查询数据库的某些值可能需要一段时间,所以我将代码取出并放入NSOperation
子类中。最后,它通过委托回调的视图控制器来更新当前数据:当实际输入进去我的搜索栏
[self.searchOperationDelegate searchDidFinishWithResults:self.searchResults];
所以,我这样做:
- (void)searchBar:(UISearchBar *)searchBar textDidChange:(NSString *)searchText
{
if (_queue.operationCount > 0) {
[_queue cancelAllOperations];
}
SearchOperation *search = [[SearchOperation alloc] initWithSearchText:searchText];
search.searchOperationDelegate = self;
[self.queue addOperation:search];
}
我基本上取消任何以前的搜索,只搜索searchText
字符串中的当前内容。
然后在我的委托回调方法在我的ViewController
- (void)searchDidFinishWithResults:(NSArray *)results {
NSLog(@"resultsList: %i", [results count]);
[self performSelectorOnMainThread:@selector(setResultsList:) withObject:results waitUntilDone:YES];
// [self.searchDisplayController.searchResultsTableView reloadData];
}
我也有一个日志中我cellForRowAtIndexPath
方法来检查多少项目都在我的结果计数。当我看,我基本上得到cellForRowAtIndexPath
多次(根据我们正在寻找的说1000-3000),但在我的searchDidFinishWithResults:
方法,我得到1项。总是调用cellForRowAtIndexPath
,然后用这个searchDidFinishWithResults:
方法。所以在我更新模型后,表格不再更新,我不知道为什么。我想我可以手动拨打reloadData
,但这给了我相同的结果。
那么什么得到目前登入的更具体的例子是这样的:
resultsList: 2909 (I type in one key, and only this gets logged)
tableView:cellForRowAtIndexPath:] 2909 (my second key in the search bar, this gets logged)
tableView:cellForRowAtIndexPath:] 2909
tableView:cellForRowAtIndexPath:] 2909
tableView:cellForRowAtIndexPath:] 2909
tableView:cellForRowAtIndexPath:] 2909
tableView:cellForRowAtIndexPath:] 2909
tableView:cellForRowAtIndexPath:] 2909
resultsList: 1370 (this is the last thing that gets logged when my 2nd key is pressed)
tableView:cellForRowAtIndexPath:] 1370 (this is the first thing that gets logged when my 3rd key is pressed)
tableView:cellForRowAtIndexPath:] 1370
tableView:cellForRowAtIndexPath:] 1370
tableView:cellForRowAtIndexPath:] 1370
tableView:cellForRowAtIndexPath:] 1370
tableView:cellForRowAtIndexPath:] 1370
tableView:cellForRowAtIndexPath:] 1370
resultsList: 1 (last thing that gets logged when my 3rd key is pressed)
有什么想法?提前致谢!
答
好吧我想通了。 reloadData确实有效。问题是,我试图调用
[self.searchDisplayController.searchResultsTableView reloadData];
代替
[self.SearchController.searchResultsTableView reloadData];