IOS之表视图添加索引

我们要实现的效果如下。

   

1.修改ControlView.h，即添加变量dict，用于存储TabelView的数据源。

#import <UIKit/UIKit.h>

@interface IkrboyViewController5 : UIViewController{
    NSMutableDictionary *dict;
}

@end

 2.在ControlView.m添加如下修改

- (void)viewDidLoad
{
    [super viewDidLoad];
    [self initTableViewData];
    // Do any additional setup after loading the view.
}

-(void)initTableViewData{
    NSBundle *bundle = [NSBundle mainBundle];
    NSString *plistPath = [bundle pathForResource:@"user_head" ofType:@"plist"];
    NSArray *dataArr = [[NSArray alloc] initWithContentsOfFile:plistPath];
    //将所有数据分为三组
    NSMutableArray *arr1 = [NSMutableArray array];
    NSMutableArray *arr2 = [NSMutableArray array];
    NSMutableArray *arr3 = [NSMutableArray array];

    dict = [NSMutableDictionary dictionary];
    [dict setObject:arr1 forKey:@"Group1"];
    [dict setObject:arr2 forKey:@"Group2"];
    [dict setObject:arr3 forKey:@"Group3"];

    //设置划分数据的依据，即根据index分三组，index为0-1的为第一组，2-4为第二组，5为第三组
    for(NSInteger index = 0; index < [dataArr count]; index++){
        NSDictionary *item = [dataArr objectAtIndex:index];
        if(index<2){
            [arr1 addObject:item];
        }
        else if(index>=2&&index<5){
            [arr2 addObject:item];
        }
        else if(index>=5){
            [arr3 addObject:item];
        }
    }
}

 3.初始化TableView

//分为多少个分组
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    return [[dict allKeys] count];
}
//每个分组的数据单元个数
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    switch(section)
    {
        case 0:
        {
            return [[dict objectForKey:@"Group1"] count];
        }
        case 1:
        {
            return [[dict objectForKey:@"Group2"] count];
        }
        case 2:
        {
            return [[dict objectForKey:@"Group3"] count];
        }
    }
    return 0;
}
//分组的标题，不实现下面的方法，不显示分组标题
- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section
{
    //dict allKeys取出的key arr无顺序，需进行排序
    NSArray *arr = [[dict allKeys] sortedArrayUsingSelector:@selector(compare:)];
    return [arr objectAtIndex:section];
}
//列表右侧的索引提示，不实现下面的方法，不显示右侧索引
-(NSArray *) sectionIndexTitlesForTableView: (UITableView *) tableView
{
    //dict allKeys取出的key arr无顺序，需进行排序
    NSArray *arr = [[dict allKeys] sortedArrayUsingSelector:@selector(compare:)];
    return arr;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *CellIdentifier = @"myTableCell";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];

    NSUInteger row = [indexPath row];
    NSUInteger section = [indexPath section];
    NSArray *arr;

    switch (section) {
        case 0:
            arr = [dict objectForKey:@"Group1"];
            break;
        case 1:
            arr = [dict objectForKey:@"Group2"];
            break;
        case 2:
            arr = [dict objectForKey:@"Group3"];
            break;
        default:
            break;
    }

    NSDictionary *rowDict = [arr objectAtIndex:row];
    cell.textLabel.text =  [rowDict objectForKey:@"itemName"];
    NSLog(@"cell.label.text =  %@",[rowDict objectForKey:@"itemName"]);

    NSString *imagePath = [rowDict objectForKey:@"itemImagePath"];
    cell.imageView.image = [UIImage imageNamed:imagePath];
    NSLog(@"cell.image.image  =  %@",imagePath);

    cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;

    return cell;
}

//选中Cell响应事件
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{
    [tableView deselectRowAtIndexPath:indexPath animated:YES];//选中后的反显颜色即刻消失
    NSUInteger row = [indexPath row];
    NSUInteger section = [indexPath section];
    NSArray *arr;

    switch (section) {
        case 0:
            arr = [dict objectForKey:@"Group1"];
            break;
        case 1:
            arr = [dict objectForKey:@"Group2"];
            break;
        case 2:
            arr = [dict objectForKey:@"Group3"];
            break;
        default:
            break;
    }

    NSDictionary *rowDict = [arr objectAtIndex:row];
    NSString *userName =  [rowDict objectForKey:@"itemName"];
    NSLog(@"userName=%@",userName);
}