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- (NSFetchedResultsController *)fetchedResultsController
{
if (_fetchedResultsController != nil) {
return _fetchedResultsController;
}
NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
NSEntityDescription *entity = [NSEntityDescription entityForName:@"KeyRefEntity" inManagedObjectContext:self.managedObjectContext];
[fetchRequest setEntity:entity];
[fetchRequest setFetchBatchSize:20];
NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"time" ascending:NO];
NSArray *sortDescriptors = @[sortDescriptor];
[fetchRequest setSortDescriptors:sortDescriptors];
NSFetchedResultsController *aFetchedResultsController = [[NSFetchedResultsController alloc] initWithFetchRequest:fetchRequest managedObjectContext:self.managedObjectContext sectionNameKeyPath:@"time" cacheName:@"Master"];
aFetchedResultsController.delegate = self;
self.fetchedResultsController = aFetchedResultsController;
NSError *error = nil;
if (![self.fetchedResultsController performFetch:&error]) {
NSLog(@"Unresolved error %@, %@", error, [error userInfo]);
abort();
}
return _fetchedResultsController;
}
- (void) searchBarSearchButtonClicked:(UISearchBar *)theSearchBar {
if (self.searchBar.text !=nil)
{
NSPredicate *predicate =[NSPredicate predicateWithFormat:@"ref CONTAINS[cd] %@", self.searchBar.text];
[self.fetchedResultsController.fetchRequest setPredicate:predicate];
}
else
{
NSPredicate *predicate =[NSPredicate predicateWithFormat:@"All"];
[self.fetchedResultsController.fetchRequest setPredicate:predicate];
}
NSError *error = nil;
if (![[self fetchedResultsController] performFetch:&error])
{
NSLog(@"Unresolved error %@, %@", error, [error userInfo]);
exit(-1);
}
[self.searchBar resignFirstResponder];
[self.tableView reloadData];
}
我想使用此代码进行搜索,但里面searchBarSearchButtonClicked:
代码不工作,我把一个破发点全部代码执行,但没有任何反应。为什么nspredicate不工作
searchBarSearchButtonClicked方法是否正在调用? – Balu 2013-05-10 14:35:21
@Sunny是它的调用,代理被设置,代码里面的代码全部执行没有错误,但表中没有变化 – 2013-05-10 14:43:53