tableview 侧边 index

#import "ViewController.h"@interface ViewController ()<UITableViewDataSource,UITableViewDelegate>@property (nonatomic, strong) NSMutableArray *userArray; //数据源数组@property (strong,nonatomic) NSDictionary *dicArr;@property (nonatomic, strong) UITableView *tableView;//UITableView索引搜索工具@property (nonatomic,strong) NSMutableArray *keys;@end@implementation ViewController- (void)viewDidLoad {    [super viewDidLoad];    [self  configureSections];    CGRect frame = self.view.bounds;    self.tableView =    [[UITableView alloc] initWithFrame:frame style:UITableViewStylePlain];    _tableView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;    _tableView.dataSource = self;    _tableView.delegate = self;    [self.view addSubview:_tableView];    // Do any additional setup after loading the view, typically from a nib.}- (NSString *)firstCharactor:(NSString *)aString{    //转成了可变字符串    NSMutableString *str = [NSMutableString stringWithString:aString];    //先转换为带声调的拼音    CFStringTransform((CFMutableStringRef)str,NULL, kCFStringTransformMandarinLatin,NO);    //再转换为不带声调的拼音    CFStringTransform((CFMutableStringRef)str,NULL, kCFStringTransformStripDiacritics,NO);    //转化为大写拼音    NSString *pinYin = [str capitalizedString];    //获取并返回首字母    return [pinYin substringToIndex:1];}//配置分组信息- (void)configureSections {    //初始化测试数据    self.dicArr = [[NSMutableDictionary alloc] init];    _userArray = [NSMutableArray arrayWithObjects:@"一小",@"二小",@"三小",@"四小",@"五小",@"六小",@"二中",@"三中",@"四中",@"八中",@"一中",@"四高",@"五高",@"一高", nil];    for (NSString *name in _userArray) {        NSString * A= [self firstCharactor:name];        NSMutableArray *mArr=[self.dicArr objectForKey:A];        if (!mArr) {            mArr = [[NSMutableArray alloc]init];        }        [mArr addObject:name];        [self.dicArr setValue:mArr forKey:A];    }    NSArray *keysArray = [self.dicArr allKeys];    NSArray *resultArray = [keysArray sortedArrayUsingComparator:^NSComparisonResult(id obj1, id obj2) {        return [obj1 compare:obj2 options:NSNumericSearch];    }];    self.keys= [[NSMutableArray alloc]initWithArray: resultArray];}#pragma mark -- delegate- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {    // The number of sections is the same as the number of titles in the collation.    return [self.keys count];}//设置每个Section下面的cell数- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {    // The number of time zones in the section is the count of the array associated with the section in the sections array.     return [[self.dicArr objectForKey:[self.keys objectAtIndex:section]] count];}- (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 = [[self.dicArr objectForKey:[self.keys objectAtIndex:indexPath.section]] objectAtIndex:indexPath.row];    return cell;}- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {    [tableView deselectRowAtIndexPath:indexPath animated:YES];     NSLog(@"%@", [[self.dicArr objectForKey:[self.keys objectAtIndex:indexPath.section]] objectAtIndex:indexPath.row]);}/* * 跟section有关的设定 *///设置section的Header- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section {      return [self.keys objectAtIndex:section];}//设置索引标题- (NSArray *)sectionIndexTitlesForTableView:(UITableView *)tableView {    return self.keys;}//索引点击事件- (NSInteger)tableView:(UITableView *)tableView sectionForSectionIndexTitle:(NSString *)title atIndex:(NSInteger)index {    [tableView scrollToRowAtIndexPath:[NSIndexPath indexPathForRow:0 inSection:index] atScrollPosition:UITableViewScrollPositionTop animated:YES];    return index;}@end