向使用字母部分的iPhone应用程序添加搜索栏

Question

我有一个使用UITableView的应用程序，其中包含产品的名称，这些产品也根据其第一个字母拆分为各自的部分。

这是我的代码：

- (void)viewDidLoad
{
    [super viewDidLoad];
        //Initialize alphabet array
        m_Alphabet = [[NSArray alloc]initWithObjects:@"A",@"B",@"C",@"D",@"E",@"F",@"G",@"H",@"I",@"J",@"K", @"L",@"M",@"N",@"O",@"P",@"Q",@"R",@"S",@"T",@"U",@"V",@"W",@"X",@"Y",@"Z",@"Other", nil];
        //Initialize alphabet distionary of arrays
        m_AlphabetDictionary = [[NSMutableArray alloc]init];
        //Populate distionary with a mutable array for each character
        //in the alphabet (plus one "Other" category)
        for (int i = 0; i < 27; i++)
            [m_AlphabetDictionary insertObject:[[NSMutableArray alloc] init] atIndex: i];
        // The number of products in the database
        appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];
        NSMutableArray *tempArray = [[NSMutableArray alloc] init];
        //For each product in the appDelgates products
        for (Product *product in appDelegate.m_Products){
            if ([product.category isEqualToString:productType]){
                [tempArray addObject:product];
                //firstLetter is equal to the first letter of the products name
                NSString * l_FirstLetter = [product.name substringToIndex:1];
                //convert firstString to uppercase
                l_FirstLetter = [l_FirstLetter uppercaseString];
                //The added flag ensures objects whose first letter isn't a letter
                //are added to array 26
                bool added = NO;
                for(int i=0; i<[m_Alphabet count]; i++){
                    //If the first letter of product name is equal to the letter at index i in theAlphabet
                    if ([l_FirstLetter isEqualToString:[m_Alphabet objectAtIndex:i]]) {
                        //Add product to section array for that letter
                        [[m_AlphabetDictionary objectAtIndex:i] addObject:product];
                        added = YES;
                    }
                }
                //If product hasn't been added to array, add it to "Others" category
                if(!added)
                    [[m_AlphabetDictionary objectAtIndex:26] addObject:product];
            }
        }
    //Set navigation controller title
    self.title = productType;
}
//Number of sections is equal to the length of the m_Alphabet array
//Letters A-Z plus "Other"
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView 
{
        return [m_Alphabet count]; 
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section 
{
        return [[m_AlphabetDictionary objectAtIndex:section] count]; 
}
- (NSArray *)sectionIndexTitlesForTableView:(UITableView *)tableView 
{
    return m_Alphabet; 
}
- (NSInteger)tableView:(UITableView *)tableView sectionForSectionIndexTitle:(NSString *)title atIndex:(NSInteger)index 
{
    return [m_Alphabet indexOfObject:title]; 
}
- (NSString *)tableView:(UITableView *)aTableView titleForHeaderInSection:(NSInteger)section
{
    if ([[m_AlphabetDictionary objectAtIndex:section] count]==0) 
        return nil;
    return [m_Alphabet objectAtIndex:section]; 
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    NSLog(@"Cell for row");
        static NSString *CellIdentifier = @"Cell";
        UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
        if (cell == nil) {
            cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
        }
    if([self.productType isEqualToString:@"All"]){
        Product *product = (Product *) [appDelegate.m_Products objectAtIndex:indexPath.row];
        cell.textLabel.text = product.name;
        // Configure the cell.
        return cell;
    }
    else {
            //Instead of using appDelegate.products use the new array that will be filled
            //by the numberOfReowsInSection method
            Product *product = (Product *)[[m_AlphabetDictionary objectAtIndex:indexPath.section] objectAtIndex:indexPath.row];
            cell.textLabel.text = product.name;
            // Configure the cell.
            return cell;
    }
}

我要做的是在表格视图的顶部添加一个搜索栏，其行为就像iPhone联系人应用程序中"所有联系人"部分中的搜索栏一样。 即当我搜索时，所有部分都消失了，只显示搜索结果，直到搜索栏再次空白。

谁能指出我正确的方向？

谢谢

千斤顶

Answer 1

看起来你需要使用UISearchDisplayController，这很可能是联系人应用程序使用的（以及邮件，地图，safari和音乐）。 它将自身显示为表视图覆盖，可能包含也可能不包含范围栏（您的选择），并根据搜索栏的文本筛选结果。 可以在此处找到涉及接口构建器的简单教程，也可以在此处找到无 IB 的 Apple 示例。