objective-c – 从NSArray创建UITableView的索引

我读过,创建一个索引的最佳方法(在uitableview一侧的a-z)是设置一个nsdiction数组,每个字典对应一个section,一个rowValue键包含一个数组.

NSDictionary
    headerTitle => ‘A’
    rowValues => {”Aardvark”,“Ape”,“Aquaman”}
NSDictionary
    headerTitle => ‘B’
    rowValues => {”Bat”,“Boot”,“Bubbles”} etc

但是,可以从所有行标题 – “{Aardvark”,“Aquaman”,“Bat”,“Bubbles”,“Cat”,“Cabbage”等)的数组中创建. ..？

解决方法

#pragma mark -
#pragma mark View lifecycle
- (void)viewDidLoad
{
    [super viewDidLoad];
    NSMutableArray *temp = [[NSMutableArray alloc] init];
    NSMutableArray *temp2 = [[NSMutableArray alloc] init];
    for(int i = 0; i < tableListArray.count; i++)
    {
        Nsstring *string = [tableListArray objectAtIndex:i];
        NSMutableDictionary *dict = [[NSMutableDictionary alloc] init];
        [dict setobject:string forKey:@"Name"];
        [dict setobject:[NSNumber numberWithInt:i] forKey:@"ID"];
        Nsstring *firstString = [string substringToIndex:1];
        if([temp2 containsObject:firstString] == NO || temp2.count == 0)
        {
            if(temp2.count != 0)
            {
                [temp addobject:temp2];
                [temp2 release];
                temp2 = [[NSMutableArray alloc] init];
            }
            [temp2 addobject:firstString];
        }
        [temp2 addobject:dict];
        [dict release];
    }
    [temp addobject:temp2];
    detailListArray = [[NSArray alloc] initWithArray:temp];
    [temp release];
    [temp2 release];
}

#pragma mark -
#pragma mark Table view data source
- (NSInteger)tableView:(UITableView *)tableView 
sectionForSectionIndexTitle:(Nsstring *)title atIndex:(NSInteger)index
{
    int i = 0;
    for(NSArray *array in detailListArray)
    {
        Nsstring *string = [array objectAtIndex:0];
        if([string compare:title] == NSOrderedSame)
            break;
        i++;
    }
    return i;
}

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    return detailListArray.count;
}

- (Nsstring *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section
{
    NSArray *array = [detailListArray objectAtIndex:section];
    return [array objectAtIndex:0];
}

- (NSArray *)sectionIndexTitlesForTableView:(UITableView *)tableView 
{
    NSMutableArray *titleArray = [NSMutableArray array];
    [titleArray addobject:@"A"];
    [titleArray addobject:@"B"];
    [titleArray addobject:@"C"];
    [titleArray addobject:@"D"];
    [titleArray addobject:@"E"];
    [titleArray addobject:@"F"];
    [titleArray addobject:@"G"];
    [titleArray addobject:@"H"];
    [titleArray addobject:@"I"];
    [titleArray addobject:@"J"];
    [titleArray addobject:@"K"];
    [titleArray addobject:@"L"];
    [titleArray addobject:@"M"];
    [titleArray addobject:@"N"];
    [titleArray addobject:@"O"];
    [titleArray addobject:@"P"];
    [titleArray addobject:@"Q"];
    [titleArray addobject:@"R"];
    [titleArray addobject:@"S"];
    [titleArray addobject:@"T"];
    [titleArray addobject:@"U"];
    [titleArray addobject:@"V"];
    [titleArray addobject:@"W"];
    [titleArray addobject:@"X"];
    [titleArray addobject:@"Y"];
    [titleArray addobject:@"Z"];
    return titleArray;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    NSArray *array = [detailListArray objectAtIndex:section];
    return (array.count - 1);
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    UITableViewCell *cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault
                                                    reuseIdentifier:@"CELL"] autorelease];
    NSArray *array = [detailListArray objectAtIndex:indexPath.section];
    NSDictionary *dict = [array objectAtIndex:indexPath.row + 1];
    cell.textLabel.text = [dict objectForKey:@"Name"];
    return cell;
}

#pragma mark -
#pragma mark Table view delegate
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    NSArray *array = [detailListArray objectAtIndex:indexPath.section];
    NSDictionary *dict = [array objectAtIndex:indexPath.row + 1];
    int entryID = [[dict objectForKey:@"ID"] intValue];
     // Do what ever you want to do with the selected row here....
}

这是我在最近的一个项目中使用的代码.