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我正在尝试使用在 uipickerview (PickerViewController.m) 中选择的结果来过滤现有的 uitableview (TableViewController.m)。出于某种原因,当我单击应该过滤 tableview 的按钮(位于 PickerViewController 上的“GO”)时,它只会给我应该过滤的相同完整列表。我 NSLogged 我的表视图(使用搜索结果和使用完整列表),实际上,它没有返回我的过滤结果。有谁知道我该如何解决这个问题,并让它返回过滤后的结果?代码如下。任何关于如何调整此代码的建议将不胜感激:) 我觉得我应该在我的 TableViewController中添加某种if语句?


编辑:所以我更新了我的代码,看起来它正在正确地尝试过滤我的 Strains 数组。但是它现在告诉我 searchResults 是一个空数组?为什么是这样?为了测试我的 searchResults 是否正常工作,我只实现了一个简单的if语句。见下文。

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) NSArray *searchResults;

@property (nonatomic, retain) IBOutlet UIPickerView *pickerView;

- (void)populateArray1;
- (void)populateArray2;
- (void)populateArray3;




@end

@protocol PickerViewControllerDelegate <NSObject>

- (void)PickerViewControllerDidFinish:(PickerViewController*)viewController;

@end

PickerViewController.m

  - (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"])
    {

         NSLog(@"%@", Strains);


        // Get reference to the destination view controller
        PickerResultsTableViewController *PickerTableView = [(UINavigationController *)[segue destinationViewController] topViewController];
         NSLog(@"%@", PickerTableView);

        NSPredicate *ailmentPredicate = [NSPredicate predicateWithFormat:@"SELF['Ailment'] CONTAINS[c] %@", [pickerView selectedRowInComponent:0]];

        NSPredicate *actionPredicate = [NSPredicate predicateWithFormat:@"SELF['Action'] CONTAINS[c] %@", [pickerView selectedRowInComponent:1]];

        NSPredicate *ingestPredicate = [NSPredicate predicateWithFormat:@"SELF['Ingestion'] CONTAINS[c] %@", [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...

        [PickerTableView setSearchResults: searchResults];

                NSLog(@"%@", searchResults);
    }
}

@end

PickerResultsTableViewController.h

#import "PickerViewController.h"


@interface PickerResultsTableViewController : UITableViewController  {



 IBOutlet UITableView *PickerTableView;

    NSArray *Strains;

    NSArray *searchResults;

    NSMutableData *data;

}



@property (nonatomic, retain) NSArray *searchResults;


@end

PickerResultsTableViewController.m

- (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 == PickerTableView) {
            NSLog(@"Using the search results");

            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 = [[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];

}


- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];
}

- (void)viewDidAppear:(BOOL)animated
{
    [super viewDidAppear:animated];
}

- (void)viewWillDisappear:(BOOL)animated
{
    [super viewWillDisappear:animated];
}

- (void)viewDidDisappear:(BOOL)animated
{
    [super viewDidDisappear:animated];
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    // Return YES for supported orientations
    return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);
}

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
    return 82;
}
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