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我有一個是迷上了一個NSFetchedResultsController
一個UISearchBar
。如何優化核心數據NSFetchedResultsController用的UISearchBar?
它搜索的用戶將文本輸入到搜索欄。我注意到它滯後的前幾個字母,但後來它加快了起來,它們沒有滯後。有什麼辦法可以減少最初的滯後時間,並使搜索非常活潑?基於你已公佈,我可以看到你創建一個新的FetchedResultsController每個用戶改變搜索字符串時的代碼
- (void)filterResultsUsingString:(NSString *)filterString {
self.billingSearchText = filterString;
NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"name" ascending:YES];
NSArray *sortDescriptors = [[NSArray alloc] initWithObjects:sortDescriptor, nil];
[fetchRequest setSortDescriptors:sortDescriptors];
NSEntityDescription *entity = nil;
if ([self.billingSearchCategory isEqualToString:@"icd9"]) {
entity = [NSEntityDescription entityForName:@"ICD9" inManagedObjectContext:managedObjectContext];
}
else if ([self.billingSearchCategory isEqualToString:@"cpt"]) {
entity = [NSEntityDescription entityForName:@"CPT" inManagedObjectContext:managedObjectContext];
}
[fetchRequest setEntity:entity];
[sortDescriptors release];
[sortDescriptor release];
self.fetchedResultsController = [[NSFetchedResultsController alloc] initWithFetchRequest:fetchRequest managedObjectContext:managedObjectContext sectionNameKeyPath:nil cacheName:@"Root"];
[fetchRequest release];
NSPredicate *predicate =[NSPredicate predicateWithFormat:@"(name contains[cd] %@) OR (code contains[cd] %@)", self.billingSearchText, self.billingSearchText];
[self.fetchedResultsController.fetchRequest setPredicate:predicate];
NSError *error = nil;
if (![[self fetchedResultsController] performFetch:&error])
{
NSLog(@"Unresolved error %@, %@", error, [error userInfo]);
exit(-1); // Fail
}
[self.tableView reloadData];
}