动态过滤搜索数组的首次尝试 [英] first attempt at synamic filtering a search array

问题描述

我浏览了苹果教程，并尝试为该版本制作简化版本一组单词.

I looked through the apple tutorial, and I am trying to make the simplified version for an array of words.

基本上，当用户开始输入字母a时，我想动态显示数组中以a开头的所有匹配项，依此类推:

Essentially when a user starts typing the letter a, I want to dynamically show all the matches in the array that start with a, and so forth:

数组1 =自动，飞机，空中，通风，豆类，椅子

array 1 = auto, airplane, air, airy, beans, chairs

开始输入以下内容:汽车飞机空气通风

start typing a: auto airplane air airy

au:自动

这是我的代码，但是在第一种方法的shouldReloadTableForSearchString上出现错误

this is my code, but i get an error at shouldReloadTableForSearchString on the first method

提前打个招呼

#import "otherSearchViewController.h"
#import "SearchViewController.h"
#import "AppDelegate.h"

@interface itemSearchViewController ()


@end

@implementation itemSearchViewController


@synthesize listContent, filteredListContent, savedSearchTerm, savedScopeButtonIndex, searchWasActive;
@synthesize delegate;

/*
- (id)initWithStyle:(UITableViewStyle)style
{
    self = [super initWithStyle:style];
    if (self) {
        // Custom initialization
    }
    return self;
}

#pragma mark -
#pragma mark Lifecycle methods
*/

- (void)viewDidLoad
{

    //[super viewDidLoad];

    self.title = @"Search";

    NSString *path =[[NSBundle mainBundle] pathForResource:@"possibleItems" ofType:@"plist"];
    NSArray *content = [NSArray arrayWithContentsOfFile:path];
    listContent =[NSArray arrayWithArray:content];
    if([content count] == 0)

    {
        NSLog(@"nsma is empty");
    }
    NSLog(@"list contents%@", listContent);


   // NSLog(@"list content = %@", listContent);
        // create a filtered list that will contain products for the search results table.

    self.filteredListContent = [NSMutableArray arrayWithCapacity:[self.listContent count]];

        // restore search settings if they were saved in didReceiveMemoryWarning.
    if (self.savedSearchTerm)
        {
        [self.searchDisplayController setActive:self.searchWasActive];
        [self.searchDisplayController.searchBar setSelectedScopeButtonIndex:self.savedScopeButtonIndex];
        [self.searchDisplayController.searchBar setText:savedSearchTerm];

        self.savedSearchTerm = nil;
        }

    [self.tableView reloadData];
    self.tableView.scrollEnabled = YES;
}

- (void)viewDidUnload
{
        //causing problem so disabled
    //self.filteredListContent = nil;
}

- (void)viewDidDisappear:(BOOL)animated
{
        // save the state of the search UI so that it can be restored if the view is re-created
    self.searchWasActive = [self.searchDisplayController isActive];
    self.savedSearchTerm = [self.searchDisplayController.searchBar text];
    self.savedScopeButtonIndex = [self.searchDisplayController.searchBar selectedScopeButtonIndex];
}

- (void)dealloc
{
    [listContent release];
    [filteredListContent release];

    [super dealloc];
}


#pragma mark -
#pragma mark UITableView data source and delegate methods


- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    /*
     If the requesting table view is the search display controller's table view, return the count of
     the filtered list, otherwise return the count of the main list.
     */
    if (tableView == self.searchDisplayController.searchResultsTableView)
        {
        return [self.filteredListContent count];
        }
    else
        {
        return [self.listContent count];
        }
}


- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *kCellID = @"cellID";

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:kCellID];
    if (cell == nil)
        {
        cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:kCellID] autorelease];
        }

    /*
     If the requesting table view is the search display controller's table view, configure the cell using the filtered content, otherwise use the main list.
     */
    return cell;
}


- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{


    /*
     If the requesting table view is the search display controller's table view, configure the next view controller using the filtered content, otherwise use the main list.
     */

}

#pragma mark -
#pragma mark Content Filtering

- (void)filterContentForSearchText:(NSString*)searchText scope:(NSString*)scope
{
    /*
     Update the filtered array based on the search text and scope.
     */

    [self.filteredListContent removeAllObjects]; // First clear the filtered array.

    /*
     Search the main list for products whose type matches the scope (if selected) and whose name matches searchText; add items that match to the filtered array.
     */

    for (searchText in listContent){
        if ([searchText isEqualToString:scope])
            {
            NSComparisonResult result = [scope compare:searchText options:(NSCaseInsensitiveSearch|NSDiacriticInsensitiveSearch) range:NSMakeRange(0, [searchText length])];

            if (result == NSOrderedSame)
                {
                [self.filteredListContent addObject:scope];
                }
            }
        }
}


#pragma mark -
#pragma mark UISearchDisplayController Delegate Methods


//when you start typing you get this
- (BOOL)searchDisplayController:(UISearchDisplayController *)controller shouldReloadTableForSearchString:(NSString *)searchString
{
    [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{
    [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;
}

@end

推荐答案

该数组可能是自动释放的.不要使用类方法来创建它们，而要使用实例方法，即替换 NSArray * content = [NSArray arrayWithContentsOfFile:path]; 与 NSArray * content = [[NSArray分配] initWithContentsOfFile:path];

The array is probably autoreleasing. Instead of using the class methods to create them, use the instance methods, i.e., replace NSArray *content = [NSArray arrayWithContentsOfFile:path]; with NSArray *content = [[NSArray alloc] initWithContentsOfFile:path];

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