NSPredicate not filtering UITableView? - objective-c

Question

For some reason NSPredicate isn't filtering my UITableView (it's supposed to be filtering my TableView by selections made in a UIPickerView). Users make their pickerview selections, press the GO button (segue is attached from Pickerview to Table View controller).
Any idea as to why it isn't working? See code below.
ViewController.m (TABLE VIEW CONTROLLER)
- (int)numberOfSectionsInTableView: (UITableView *)tableview
{
return 1;
}
- (int)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
if (tableView == self.searchDisplayController.searchResultsTableView) {
return [searchResults count];
} else {
return [Strains count];
}
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *strainTableIdentifier = #"StrainTableCell";
StrainTableCell *cell = (StrainTableCell *)[tableView dequeueReusableCellWithIdentifier:strainTableIdentifier];
if (cell == nil)
cell = [[StrainTableCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:strainTableIdentifier];
NSArray *nib = [[NSBundle mainBundle] loadNibNamed:#"StrainTableCell" owner:self options:nil];
cell = [nib objectAtIndex:0];
if (tableView == self.searchDisplayController.searchResultsTableView) {
NSLog(#"Using the search results");
cell.titleLabel.text = [[searchResults objectAtIndex:indexPath.row] objectForKey:#"Title"];
cell.descriptionLabel.text = [[searchResults objectAtIndex:indexPath.row] objectForKey:#"Description"];
cell.ratingLabel.text = [[searchResults objectAtIndex:indexPath.row] objectForKey:#"Rating"];
cell.ailmentLabel.text = [[searchResults objectAtIndex:indexPath.row] objectForKey:#"Ailment"];
cell.actionLabel.text = [[searchResults objectAtIndex:indexPath.row] objectForKey:#"Action"];
cell.ingestLabel.text = [[searchResults objectAtIndex:indexPath.row] objectForKey:#"Ingestion"];
NSLog(#"%#", searchResults);
} else {
NSLog(#"Using the FULL LIST!!");
cell.titleLabel.text = [[Strains objectAtIndex:indexPath.row] objectForKey:#"Title"];
cell.descriptionLabel.text = [[Strains objectAtIndex:indexPath.row] objectForKey:#"Description"];
cell.ratingLabel.text = [[Strains objectAtIndex:indexPath.row] objectForKey:#"Rating"];
cell.ailmentLabel.text = [[Strains objectAtIndex:indexPath.row] objectForKey:#"Ailment"];
cell.actionLabel.text = [[Strains objectAtIndex:indexPath.row] objectForKey:#"Action"];
cell.ingestLabel.text = [[Strains objectAtIndex:indexPath.row] objectForKey:#"Ingestion"];
}
return cell;
}
- (void)filterContentForSearchText:(NSString*)searchText scope:(NSString*)scope
{
NSPredicate *resultPredicate = [NSPredicate
predicateWithFormat:#"Title contains[cd] %#",
searchText];
searchResults = [Strains filteredArrayUsingPredicate:resultPredicate];
}
-(BOOL)searchDisplayController:(UISearchDisplayController *)controller
shouldReloadTableForSearchString:(NSString *)searchString
{
[self filterContentForSearchText:searchString
scope:[[self.searchDisplayController.searchBar scopeButtonTitles]
objectAtIndex:[self.searchDisplayController.searchBar
selectedScopeButtonIndex]]];
return YES;
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
StrainDetailViewController *detailViewController = [[StrainDetailViewController alloc] initWithNibName:#"StrainDetailViewController" bundle:nil]; if ([searchResults count]) {
detailViewController.title = [[searchResults objectAtIndex:indexPath.row] objectForKey:#"Title"];
detailViewController.strainDetail = [searchResults objectAtIndex:indexPath.row];
} else {
detailViewController.title = [[Strains objectAtIndex:indexPath.row] objectForKey:#"Title"];
detailViewController.strainDetail = [Strains objectAtIndex:indexPath.row];
NSLog(#"%#", Strains);
}
[self.navigationController pushViewController:detailViewController animated:YES];
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
- (void)PickerViewControllerDidFinish:(PickerViewController *)viewController {
[self.navigationController popViewControllerAnimated:YES];
}
PickerViewController.h
#protocol PickerViewControllerDelegate;
#interface PickerViewController : UIViewController {
UIPickerView *pickerView;
NSMutableArray *array1;
NSMutableArray *array2;
NSMutableArray *array3;
NSArray *Strains;
NSArray *searchResults;
NSMutableData *data;
}
- (IBAction)buttonpressed:(UIButton *)sender;
#property (nonatomic, weak) id<PickerViewControllerDelegate> delegate;
#property (nonatomic, retain) IBOutlet UIPickerView *pickerView;
- (void)populateArray1;
- (void)populateArray2;
- (void)populateArray3;
#end
#protocol PickerViewControllerDelegate <NSObject>
- (void)PickerViewControllerDidFinish:(PickerViewController*)viewController;
#end
PickerViewController.m
#pragma mark -
#pragma mark picker view methods
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView;
{
return 3;
}
- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component
{
if (component == 0)
{
NSLog(#"you selected %#", [array1 objectAtIndex:row]);
}
if (component == 1)
{
NSLog(#"you selected %#", [array2 objectAtIndex:row]);
}
if (component == 2)
{
NSLog(#"you selected %#", [array3 objectAtIndex:row]);
}
}
- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component;
{
if (component == 0)
{
return [array1 count];
}
if (component == 1)
{
return [array2 count];
}
if (component == 2)
{
return [array3 count];
}
else
{
return [array1 count];
}
}
- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component;
{
if (component == 0)
{
return [array1 objectAtIndex:row];
}
if (component == 1)
{
return [array2 objectAtIndex:row];
}
if (component == 2)
{
return [array3 objectAtIndex:row];
}
else
{
return [array2 objectAtIndex:row];
}
}
- (void)populateArray1
{
array1 = [[NSMutableArray alloc] init];
[array1 addObject:#"Arthritis"];
[array1 addObject:#"Cancer"];
[array1 addObject:#"HIV"];
[array1 addObject:#"Migraines"];
[array1 addObject:#"Insomnia"];
}
- (void)populateArray2
{
array2 = [[NSMutableArray alloc] init];
[array2 addObject:#"Nausea"];
[array2 addObject:#"Pain"];
[array2 addObject:#"Appetite"];
[array2 addObject:#"Fever"];
[array2 addObject:#"Exhaustion"];
}
- (void)populateArray3
{
array3 = [[NSMutableArray alloc] init];
[array3 addObject:#"Oil"];
[array3 addObject:#"Plant"];
[array3 addObject:#"Edible"];
[array3 addObject:#"Powder"];
}
- (IBAction)buttonpressed:(UIButton *)sender {
NSLog(#"Button Pushed!");
}
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
// Make sure your segue name in storyboard is the same as this line
if ([[segue identifier] isEqualToString:#"pickerGo"])
{
// Get reference to the destination view controller
ViewController *strainTableView = [(UINavigationController *)[segue destinationViewController] topViewController];
NSPredicate *ailmentPredicate = [NSPredicate predicateWithFormat:#"Ailment contains[cd] %#", [pickerView selectedRowInComponent:0]];
NSPredicate *actionPredicate = [NSPredicate predicateWithFormat:#"Action contains[cd] %#", [pickerView selectedRowInComponent:1]];
NSPredicate *ingestPredicate = [NSPredicate predicateWithFormat:#"Ingestion contains[cd] %#", [pickerView selectedRowInComponent:2]];
NSCompoundPredicate *resultPredicate = [NSCompoundPredicate andPredicateWithSubpredicates:[NSArray arrayWithObjects: ailmentPredicate,actionPredicate,ingestPredicate, nil]];
searchResults = [Strains filteredArrayUsingPredicate:resultPredicate];
// Pass any objects to the view controller here, like...
[strainTableView setSearchResults: searchResults];
}
}

Answer 1

Very puzzling, your code actually seems ok to me. I'd start by NSLoging searchResults right after the searchResults = [Strains filteredArrayUsingPredicate:resultPredicate]; line is fired, just in case something funny is happening in the table view delegates.
You should also probably check out the free Sensible TableView framework, as it provides automatic searching and filtering for your data. Should save you a ton of time.

Answer 2

It seems your Strains array contains dictionaries. So you should decide on what key you want to filter, for example the Title key, instead of using SELF:
NSPredicate *resultPredicate = [NSPredicate
predicateWithFormat:#"Title contains[cd] %#",
searchText];
From the pickerViewController, you need to go back to the tableViewController. You can use delegate. And try to make a separate function in the table view controller to filter which contains the predicate:
- (void)filterContentForPicker:(NSString*)searchText
{
NSPredicate *resultPredicate = [NSPredicate
predicateWithFormat:#"Title contains[cd] %#",
searchText];
searchResults = [Strains filteredArrayUsingPredicate:resultPredicate];
[self.tableView reloadData]
}