Here is a sample code
NSMutableArray *filteredResult; // this holds filtered data source
NSMutableArray *tableData; //this holds actual data source
-(void) filterForSearchText:(NSString *) text scope:(NSString *) scope
{
[filteredResult removeAllObjects]; // clearing filter array
NSPredicate *filterPredicate = [NSPredicate predicateWithFormat:@"SELF.restaurantName contains[c] %@",text]; // Creating filter condition
filteredResult = [NSMutableArray arrayWithArray:[tableData filteredArrayUsingPredicate:filterPredicate]]; // filtering result
}
Delegate Methods
-(BOOL) searchDisplayController:(UISearchDisplayController *)controller shouldReloadTableForSearchString:(NSString *)searchString
{
[self filterForSearchText:searchString scope:[[[[self searchDisplayController] searchBar] scopeButtonTitles] objectAtIndex:[[[self searchDisplayController] searchBar] selectedScopeButtonIndex] ]];
return YES;
}
-(BOOL) searchDisplayController:(UISearchDisplayController *)controller shouldReloadTableForSearchScope:(NSInteger)searchOption
{
[self filterForSearchText:self.searchDisplayController.searchBar.text scope:
[[self.searchDisplayController.searchBar scopeButtonTitles] objectAtIndex:searchOption]];
return YES;
}
In NSPredicate condition "@"SELF.restaurantName contains[c] %@",text " restaurantName is a property name which needs to filtered against. If you have only NSString in your datasource array, you can use like @"SELF contains[c] %@",text
Once the filter is done, then you need to implement your tableview delegate accordingly. Something like this
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
if(tableView == [[self searchDisplayController] searchResultsTableView])
{
return [filteredResult count];
}
else
{
return [tableData count];
}
}
compare the tableview whether it is filtered tableview or original tableview and set the delegate and datasource for tableview accordingly.Please note, searchDisplayController is available property for UIViewcontroller and we can just use it to display filtered result.
For above code to work, you need to use "Search Bar and Search Display" object if you are using it in a XIB or storyboard
