我希望能够将搜索功能添加到我的表格视图中。该表列出了各种商店位置。我希望用户能够按城市过滤。我一直在考虑以某种方式添加一个下拉列表，也许在 tableviewcell 中创建过滤器。有没有人这样做可以帮助我？
我已经在表格视图中有一个搜索栏控件，但它只搜索记录的一个字段。如何决定或选择搜索栏在我的数据中实际查找的字段？这是我的代码：
#pragma mark Content Filtering
-(void)filterContentForSearchText:(NSString*)searchText scope:(NSString*)scope {
// Update the filtered array based on the search text and scope.
// Remove all objects from the filtered search array
[self.filteredResultsArray removeAllObjects];
// Filter the array using NSPredicate
NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF.name contains[c] %@",searchText];
[self.filteredResultsArray = [NSMutableArray arrayWithArray:[self.dates filteredArrayUsingPredicate:predicate]] retain];
}
#pragma mark - UISearchDisplayController Delegate Methods
-(BOOL)searchDisplayController:(UISearchDisplayController *)controller shouldReloadTableForSearchString:(NSString *)searchString {
// Tells the table data source to reload when text changes
[self filterContentForSearchText:searchString scope:
[[self.searchDisplayController.searchBar scopeButtonTitles] objectAtIndex:[self.searchDisplayController.searchBar selectedScopeButtonIndex]]];
// Return YES to cause the search result table view to be reloaded.
return YES;
}
-(BOOL)searchDisplayController:(UISearchDisplayController *)controller shouldReloadTableForSearchScope:(NSInteger)searchOption {
// Tells the table data source to reload when scope bar selection changes
[self filterContentForSearchText:self.searchDisplayController.searchBar.text scope:
[[self.searchDisplayController.searchBar scopeButtonTitles] objectAtIndex:searchOption]];
// Return YES to cause the search result table view to be reloaded.
return YES;
}
我的 self.dates 数组填充如下：
- (void)loadRecordsFromCoreData {
[self.managedObjectContext performBlockAndWait:^{
[self.managedObjectContext reset];
NSError *error = nil;
NSFetchRequest *request = [[NSFetchRequest alloc] initWithEntityName:self.entityName];
[request setSortDescriptors:[NSArray arrayWithObject:
[NSSortDescriptor sortDescriptorWithKey:@"date" ascending:YES]]];
self.dates = [self.managedObjectContext executeFetchRequest:request error:&error];
}];
}
它与 initWithEntityName 是否有关系...