#import <UIKit/UIKit.h>@interface ViewController : UIViewController<UITableViewDataSource,UITableViewDelegate>{    UITableView *myTableView;    NSMutableArray *dataArray;    NSMutableArray *indexArray;}@end

#import "ViewController.h"@interface ViewController ()@end@implementation ViewController- (void)viewDidLoad {    [super viewDidLoad];    // Do any additional setup after loading the view, typically from a nib.           myTableView = [[UITableView alloc]initWithFrame:CGRectMake(0, 0, 320, 500)];   myTableView.dataSource=self;   myTableView.delegate=self;   //设置索引为橙色   myTableView.sectionIndexColor = [UIColor orangeColor];   [self.view addSubview:myTableView];            for(char c = ‘A‘; c <= ‘Z‘; c++ )    {        if (!dataArray) {            dataArray=[[NSMutableArray alloc]init];        }        if (!indexArray) {            indexArray=[[NSMutableArray alloc]init];        }                [indexArray addObject:[NSString stringWithFormat:@"%c",c]];        [dataArray addObject:[NSString stringWithFormat:@"%c",c]];        [dataArray addObject:[NSString stringWithFormat:@"%c",c]];        [dataArray addObject:[NSString stringWithFormat:@"%c",c]];    }        NSLog(@"----indexArray--%@",indexArray);    NSLog(@"------dataArray----%@",dataArray);}#pragma -mark -UITableViewDelegate- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView{    return [indexArray count];}- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{    return 3;}- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{    static NSString *CellIdentifier = @"Cell";    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];        if(cell == nil)    {        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];    }        cell.textLabel.text = [dataArray objectAtIndex:indexPath.section * 3 + indexPath.row];        return cell;}-(NSArray *)sectionIndexTitlesForTableView:(UITableView *)tableView{    return indexArray;}-(NSInteger)tableView:(UITableView *)tableView sectionForSectionIndexTitle:(NSString *)title atIndex:(NSInteger)index{    NSInteger count = 0;        for(NSString *character in indexArray)    {        if([character isEqualToString:title])        {            return count;        }        count ++;    }    return 0;}-(NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section{    return [indexArray objectAtIndex:section];}