Question

我的代码来自this示例。初始数据显示在表视图中，但我不确定如何实现其余部分以显示过滤后的数据。我没有错误，搜索栏工作，但没有过滤数据。这是我的plist XML：

<dict>
    <key>Things to do</key>
    <array>
        <dict>
            <key>activity</key>
            <string>Watch movies or TV shows</string>
            <key>keywords</key>
            <array>
                <string>tv shows</string>
                <string>movies</string>
            </array>
        </dict>
        <dict>
            <key>activity</key>
            <string>Go Hiking</string>
            <key>keywords</key>
            <array>
                <string>hiking</string>
                <string>mountains</string>
            </array>
        </dict>
        <dict>
            <key>activity</key>
            <string>Video Games</string>
            <key>keywords</key>
            <array>
                <string>video games</string>
                <string>playstation</string>
                <string>xbox</string>
                <string>nintendo</string>
            </array>
        </dict>
    </array>
</dict>

这是我的CategoriesViewController.m：

@interface CategoriesViewController () <UISearchDisplayDelegate>

@property (nonatomic, strong) NSMutableArray *tableData;
@property (nonatomic, strong) NSMutableArray *searchResults;
@property (weak, nonatomic) IBOutlet UISearchBar *searchBar;

@end

- (void)viewDidLoad
{
[super viewDidLoad];
NSString *plistPath = [[NSBundle mainBundle] pathForResource:@"categories" ofType:@"plist"];
NSDictionary *categoriesDictionary = [[NSDictionary alloc] initWithContentsOfFile:plistPath];

self.tableData = categoriesDictionary[@"Things to do"];
//I think this next line is supposed to make it appear on top of the original table
self.searchResults = [NSMutableArray arrayWithCapacity:[self.tableData count]];
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *CellIdentifier = @"Cell";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
    if (cell == nil) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
    }
    if (tableView == self.searchDisplayController.searchResultsTableView)
    {
        cell.textLabel.text = [self.searchResults objectAtIndex:indexPath.row];
    } else {
        cell.textLabel.text = self.tableData[indexPath.row][@"activity"];
    }

    return cell;
}

- (void)filterContentForSearchText:(NSString*)searchText scope:(NSString*)scope
{   
    [self.searchResults removeAllObjects];

    NSPredicate *resultPredicate = [NSPredicate
    predicateWithFormat:@"SELF contains[cd] %@",
    searchText];

    self.searchResults = [NSMutableArray arrayWithArray:[self.tableData filteredArrayUsingPredicate:resultPredicate]];
}

-(BOOL)searchDisplayController:(UISearchDisplayController *)controller
shouldReloadTableForSearchString:(NSString *)searchString
{
    [self filterContentForSearchText:searchString
    scope:[[self.searchDisplayController.searchBar scopeButtonTitles]
    objectAtIndex:[self.searchDisplayController.searchBar
    selectedScopeButtonIndex]]];
    return YES;
}

这就像示例，除了我改变了我的数据来源。如何根据关键字进行搜索？在这个例子中，我只搜索初始表视图中包含的内容吗？谢谢你的时间......

Answer 1

没有更多代码就很难说，但我认为你需要根据搜索字符串显示/隐藏你的两个表视图。

如果该字符串为空，则会隐藏您的searchResultsTableView并显示您正在亲切地调用whatEverYouCalledYourOtherTableView的其他表格视图。

如果您的字符串不为空，则执行搜索，显示searchResultsTableView，隐藏whatEverYouCalledYourOtherTableView并重新加载searchResultsTableView的数据。

-(BOOL)searchDisplayController:(UISearchDisplayController *)controller shouldReloadTableForSearchString:(NSString *)searchString
{
    if ([searchString isEqualToString:@""])
    {
        self.searchDisplayController.searchResultsTableView.hidden = YES;
        self.searchDisplayController.whatEverYouCalledYourOtherTableView.hidden = NO;
    }
    else
    {
        [self filterContentForSearchText:searchString
                                   scope:[[self.searchDisplayController.searchBar scopeButtonTitles]
                           objectAtIndex:[self.searchDisplayController.searchBar selectedScopeButtonIndex]]];


        self.searchDisplayController.searchResultsTableView.hidden = NO;
        self.searchDisplayController.whatEverYouCalledYourOtherTableView.hidden = YES;
        [self.searchDisplayController.searchResultsTableView reloadData];
    }
    return YES;
}

您的filterContentForSearchText也是错误的。你有一个字典数组而不是字符串。首先抓住字符串，然后运行搜索。您最好立即创建字符串字典，让搜索工作的最简单方法就是这样。

- (void)filterContentForSearchText:(NSString*)searchText scope:(NSString*)scope
{   
    [self.searchResults removeAllObjects];

    NSPredicate *resultPredicate = [NSPredicate predicateWithFormat:@"SELF contains[cd] %@", searchText];

    NSMutableArray *activityArray = [[NSMutableArray alloc] init];
    for (int i = 0; i < [self.tableData count]; i++)
    {
        [activityArray addObject:self.tableData[i][@"activity"]];
    }

    self.searchResults = [NSMutableArray arrayWithArray:[activityArray filteredArrayUsingPredicate:resultPredicate]];
}

objective-c过滤表视图，包含来自plist的数据

1 个答案: