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//
// ViewController.m
// TableViewIndexDemo
//
// Created by cqcityroot on 16/4/20.
// Copyright © 2016年 cqmc. All rights reserved.
//
#import "ViewController.h"
#import "ContactCell.h"
static NSString *contactsCellIdentifier = @"contactsCell";
@interface ViewController ()<UITableViewDataSource,UITableViewDelegate>
{
NSUInteger _lastContactsHash;
}
@property (strong, nonatomic) UITableView *tableView;
@property (strong, nonatomic) NSArray *contacts; // 存放排序后的内容
@property (strong, nonatomic) NSArray *indexList; // 存放右侧索引
@end
@implementation ViewController
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view.
[self setupSubviews];
[self updateContent];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (void)updateContent {
NSArray *xings = @[@"赵",@"钱",@"孙",@"李",@"周",@"吴",@"郑",@"王",@"冯",@"陈",@"楚",@"卫",@"沈",@"杀",@"韩",@"#"];
NSArray *ming1 = @[@"大",@"美",@"帅",@"应",@"超",@"海",@"江",@"湖",@"春",@"夏",@"秋",@"冬",@"上",@"左",@"有",@"纯"];
NSArray *ming2 = @[@"强",@"好",@"领",@"亮",@"超",@"华",@"奎",@"海",@"工",@"青",@"红",@"潮",@"兵",@"垂",@"刚",@"山"];
NSMutableArray *nameArr = [NSMutableArray array];
for (int i = 0; i < 50; i++) {
NSString *name = xings[arc4random_uniform((int)xings.count)];
NSString *ming = ming1[arc4random_uniform((int)ming1.count)];
name = [name stringByAppendingString:ming];
if (arc4random_uniform(10) > 3) {
NSString *ming = ming2[arc4random_uniform((int)ming2.count)];
name = [name stringByAppendingString:ming];
}
[nameArr addObject:name];
}
NSMutableArray *tmpArr = [NSMutableArray array];
for (NSString *name in nameArr) {
ContactEntity *contact = [[ContactEntity alloc] init];
contact.name = name;
contact.detail = @"测试标题";
contact.avatarUrl = @"78268.jpg";
[tmpArr addObject:contact];
}
self.contacts = tmpArr;
}
//set方法
- (void)setContacts:(NSArray *)objects {
if (objects.hash == _lastContactsHash) {
return;
}
_lastContactsHash = objects.hash;
// NSLog(@"_lastContactsHash---%ld",_lastContactsHash);
_contacts = [self arrayForSections:objects];
[_tableView reloadData];
}
- (NSArray *)arrayForSections:(NSArray *)objects {
/*
avatarUr
name;
detail;
*/
// sectionTitlesCount 27 , A - Z + #
SEL selector = @selector(name);
UILocalizedIndexedCollation *collation = [UILocalizedIndexedCollation currentCollation];
// section number
NSInteger sectionTitlesCount = [[collation sectionTitles] count];
// Create 27 sections‘ data 每个索引字母对应一个数组
NSMutableArray *mutableSections = [[NSMutableArray alloc] initWithCapacity:sectionTitlesCount];
for (NSUInteger idx = 0; idx < sectionTitlesCount; idx++) {
[mutableSections addObject:[NSMutableArray array]];
}
// Insert records 将传进来的数组中的元素逐个分到所属相应索引对应的数组
for (id object in objects) {
NSInteger sectionNumber = [collation sectionForObject:object collationStringSelector:selector];
NSLog(@"%ld---%@",sectionNumber,(ContactEntity *)object);
[[mutableSections objectAtIndex:sectionNumber] addObject:object];
}
// sort in section 每个索引对应的数组中的元素进行排序
for (NSUInteger idx = 0; idx < sectionTitlesCount; idx++) {
NSArray *objectsForSection = [mutableSections objectAtIndex:idx];
[mutableSections replaceObjectAtIndex:idx withObject:[[UILocalizedIndexedCollation currentCollation] sortedArrayFromArray:objectsForSection collationStringSelector:selector]];
}
// Remove empty sections && insert table data
NSMutableArray *existTitleSections = [NSMutableArray array];
for (NSArray *section in mutableSections) {
if ([section count] > 0) {
[existTitleSections addObject:section];
}
}
// Remove empty sections Index in indexList
NSMutableArray *existTitles = [NSMutableArray array];
NSArray *allSections = [collation sectionIndexTitles];
for (NSUInteger i = 0; i < [allSections count]; i++) {
if ([mutableSections[ i ] count] > 0) {
[existTitles addObject:allSections[ i ]];
}
}
//create indexlist data array
self.indexList = existTitles;
return existTitleSections;
}
- (void)setupSubviews {
// Header
self.navigationItem.title = @"Contacts Index Demo";
// setup tableview
CGRect frame = self.view.bounds;
self.tableView =
[[UITableView alloc] initWithFrame:frame style:UITableViewStylePlain];
[_tableView registerClass:[ContactCell class] forCellReuseIdentifier:contactsCellIdentifier];
_tableView.autoresizesSubviews = YES;
_tableView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
_tableView.dataSource = self;
_tableView.delegate = self;
[self.view addSubview:_tableView];
// _tableView.translatesAutoresizingMaskIntoConstraints = NO;
}
#pragma mark - UITableViewDataSource
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
return [_contacts count];
}
- (NSInteger)tableView:(UITableView *)tableView
numberOfRowsInSection:(NSInteger)section
{
return [_contacts[section] count];
}
- (UITableViewCell *)tableView:(UITableView *)tableView
cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
ContactCell *cell =
[tableView dequeueReusableCellWithIdentifier:contactsCellIdentifier
forIndexPath:indexPath];
[cell updateContent:_contacts[ indexPath.section ][ indexPath.row ]];
return cell;
}
- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section
{
return _indexList[ section ];
}
//添加tableview 右侧索引
- (NSArray *)sectionIndexTitlesForTableView:(UITableView *)tableView {
return _indexList;
}
- (NSInteger)tableView:(UITableView *)tableView sectionForSectionIndexTitle:(NSString *)title
atIndex:(NSInteger)index
{
return index;
}
#pragma mark - UITableViewDelegate
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
}
@end
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原文地址：http://www.cnblogs.com/Ice-snowPride/p/5442017.html
