需求：
许多的银行展示在TableView上，需要加上UITableView的右侧索引功能、方便用户快速选择。类似通讯录的功能。
原理：
在Objective C语言中，字符串是以unicode进行编码的。在unicode字符集中，汉字的编码范围为4E00 到 9FA5 之间（即从第19968开始的20902个字符是中文简体字符）。我们把这些字符的拼音首字母按照顺序都存放在一个char数组中。当我们查找一个汉字的拼音首字母时，只需把这个汉字的unicode码（即char强制转换为int）减去19968，然后用这个数字作为索引去找char数组中存放的字母即可。参见pinyin.c文件。
获取银行名称首汉字的拼音首字母，然后根据首字母去构建二维数组，便于在UITableView的section下的展示。
tableView索引的生成需要回调代理方法：
//索引标题
-(NSArray *)sectionIndexTitlesForTableView:(UITableView *)tableView {
return self.sectionTitles;
}
//点击索引跳转到相应位置
-(NSInteger)tableView:(UITableView *)tableView sectionForSectionIndexTitle:(NSString *)title atIndex:(NSInteger)index {
NSIndexPath *selectIndexPath = [NSIndexPath indexPathForRow:0 inSection:index];
if (![self.contentArrs[index] count]) {
return 0;
}else{
[tableView scrollToRowAtIndexPath:selectIndexPath atScrollPosition:UITableViewScrollPositionNone animated:YES];
return index;
}
}
1.png
/*
* pinyin.h
* Chinese Pinyin First Letter
*
*
*/
/*
* // Example
*
* #import "pinyin.h"
*
* NSString *hanyu = @"您好！";
* for (int i = 0; i < [hanyu length]; i++)
* {
* printf("%c", pinyinFirstLetter([hanyu characterAtIndex:i]));
* }
*
*/
#define ALPHA @"ABCDEFGHIJKLMNOPQRSTUVWXYZ#"
char pinyinFirstLetter(unsigned short hanzi);
/*
* pinyin.c
* Chinese Pinyin First Letter
*
*
*/
#define HANZI_START 19968
#define HANZI_COUNT 20902
static char firstLetterArray[HANZI_COUNT] =
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"xy";
char pinyinFirstLetter(unsigned short hanzi)
{
int index = hanzi - HANZI_START;
if (index >= 0 && index <= HANZI_COUNT)
{
return firstLetterArray[index];
}
else
{
return hanzi;
}
}
//
// ChineseString.h
// ChineseSort
//
//
#import
@interface ChineseString : NSObject
@property(retain,nonatomic)NSString *string;
@property(retain,nonatomic)NSString *pinYin;
@end
//
// ChineseString.m
// ChineseSort
#import "ChineseString.h"
@implementation ChineseString
@synthesize string;
@synthesize pinYin;
@end
//
// PYTableViewIndexManager.h
// PYTableViewIndex
#import
@interface PYTableViewIndexManager : NSObject
+ (NSArray *)archiveNumbers:(NSArray *)originalArray;
@end
//
// PYTableViewIndexManager.m
// PYTableViewIndex
//
#import "PYTableViewIndexManager.h"
#import "PYTableViewIndexModel.h"
#import "pinyin.h"
@implementation PYTableViewIndexManager
+ (NSArray *)archiveNumbers:(NSArray *)originalArray {
NSMutableArray *stringsToSort = [[NSMutableArray alloc] initWithArray:originalArray];
NSMutableArray *chineseStringsArray = [NSMutableArray array];
for(NSInteger i = 0; i < [stringsToSort count]; i++) {
PYTableViewIndexModel *model = stringsToSort[i];
model.chineseString = [[ChineseString alloc] init];
model.chineseString.string = model.nickName;
if(model.chineseString.string == nil) {
model.chineseString.string = @"";
}
if(![model.chineseString.string isEqualToString:@""]){
NSString *pinYinResult = [NSString string];
for(NSInteger j = 0; j < model.chineseString.string.length; j++){
NSString *singlePinyinLetter = [[NSString stringWithFormat:@"%c", pinyinFirstLetter([model.chineseString.string characterAtIndex:j])] uppercaseString];
pinYinResult = [pinYinResult stringByAppendingString:singlePinyinLetter];
}
model.chineseString.pinYin=pinYinResult;
}else{
model.chineseString.pinYin = @"";
}
[chineseStringsArray addObject:model];
}
NSArray *letters = @[@"A",@"B",@"C",@"D",@"E",@"F",@"G",@"H",@"I",@"J",@"K",@"L",@"M",@"N",@"O",@"P",@"Q",@"R",@"S",@"T",@"U",@"V",@"W",@"X",@"Y",@"Z",@"#"];
NSArray *numbers = @[@"0",@"1",@"2",@"3",@"4",@"5",@"6",@"7",@"8",@"9"];
NSMutableArray *datas = [[NSMutableArray alloc]init];
for (int i = 0; i < 27; i++) {
NSMutableArray *arr = [[NSMutableArray alloc] init];
[datas addObject:arr];
}
for (int i = 0; i < chineseStringsArray.count; i++) {
PYTableViewIndexModel *model = chineseStringsArray[i];
for (int j = 0; j < letters.count; j++) {
if ([[model.chineseString.pinYin substringToIndex:1] isEqualToString:letters[j]]) {
[datas[j] insertObject:model atIndex:0];
break;
}
for (int k = 0; k < numbers.count; k++) {
if ([[model.chineseString.pinYin substringToIndex:1] isEqualToString:numbers[k]]) {
[datas[26] insertObject:model atIndex:0];
break;
}
}
}
}
return datas;
}
@end
//
// PYTableViewIndexModel.h
// PYTableViewIndex
#import
#import "ChineseString.h"
@interface PYTableViewIndexModel : NSObject
@property (strong,nonatomic) NSString *nickName;
@property (strong,nonatomic) ChineseString *chineseString;
@end
//
// PYTableViewIndexModel.m
// PYTableViewIndex
//
#import "PYTableViewIndexModel.h"
@implementation PYTableViewIndexModel
@end
//
// ViewController.m
#import "ViewController.h"
#import "PYTableViewIndexModel.h"
#import "PYTableViewIndexManager.h"
#define SCREEN_WIDTH ([UIScreen mainScreen].bounds.size.width)
#define SCREEN_HEIGHT ([UIScreen mainScreen].bounds.size.height)
@interface ViewController ()
@property (nonatomic, strong) UITableView *tableview;
@property (strong,nonatomic) NSMutableArray *sectionTitles;//头标题数组
@property (strong,nonatomic) NSMutableArray *contentArrs;//内容数组
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
self.sectionTitles = [[NSMutableArray alloc]initWithObjects:@"A",@"B",@"C",@"D",@"E",@"F",@"G",@"H",@"I",@"J",@"K",@"L",@"M",@"N",@"O",@"P",@"Q",@"R",@"S",@"T",@"U",@"V",@"W",@"X",@"Y",@"Z",@"#", nil];
NSArray *Arr = @[@"找",@"钱",@"孙",@"离",@"周",@"五",@"正",@"网",@"风",@"陈",@"出",@"为",@"讲",@"身",@"汗",@"样",@"住",@"亲",@"又",@"许",@"和",@"刘",@"是",@"张",@"空",@"苍",@"眼",@"话",@"祝",@"喂",@"套",@"江"];
NSMutableArray *jsonArray = [[NSMutableArray alloc]init];
for (int i = 0; i < 50; i++) {
int one = arc4random()%32;
int two = arc4random()%32;
int three = arc4random()%32;
PYTableViewIndexModel *model = [[PYTableViewIndexModel alloc]init];
model.nickName = [NSString stringWithFormat:@"%@%@%@",Arr[one],Arr[two],Arr[three]];
[jsonArray addObject:model];
}
self.contentArrs = [[NSMutableArray alloc]initWithArray:[PYTableViewIndexManager archiveNumbers:jsonArray]];
for (int i = (int)self.contentArrs.count-1; i>=0; i--) {
if ([self.contentArrs[i] count] == 0) {
[self.sectionTitles removeObjectAtIndex:i];
[self.contentArrs removeObjectAtIndex:i];
}
}
[self.tableview reloadData];
[self.view addSubview:self.tableview];
}
- (UITableView *)tableview{
if (!_tableview) {
_tableview = [[UITableView alloc]initWithFrame:CGRectMake(0, 20, SCREEN_WIDTH, SCREEN_HEIGHT-20) style:UITableViewStylePlain];
_tableview.delegate = self;
_tableview.dataSource = self;
for (UIView *subview in [_tableview subviews]) { if ([subview isKindOfClass:NSClassFromString(@"UITableViewIndex")]) { [subview setBackgroundColor:[UIColor colorWithPatternImage:[UIImage imageNamed:@"line.jpg"]]]; } }
}
return _tableview;
}
- (NSMutableArray *)sectionTitles{
if (!_sectionTitles) {
_sectionTitles = [[NSMutableArray alloc]init];
}
return _sectionTitles;
}
- (NSMutableArray *)contentArrs{
if (!_contentArrs) {
_contentArrs = [[NSMutableArray alloc]init];
}
return _contentArrs;
}
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView{
return self.contentArrs.count;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
return [self.contentArrs[section] count];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
static NSString *cellId = @"";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellId];
if (!cell) {
cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellId];
}
PYTableViewIndexModel *model = self.contentArrs[indexPath.section][indexPath.row];
cell.textLabel.text = model.nickName;
return cell;
}
-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
[tableView deselectRowAtIndexPath:indexPath animated:YES];
}
//点击索引跳转到相应位置
-(NSInteger)tableView:(UITableView *)tableView sectionForSectionIndexTitle:(NSString *)title atIndex:(NSInteger)index
{
NSIndexPath *selectIndexPath = [NSIndexPath indexPathForRow:0 inSection:index];
if (![self.contentArrs[index] count]) {
return 0;
}else{
[tableView scrollToRowAtIndexPath:selectIndexPath atScrollPosition:UITableViewScrollPositionNone animated:YES];
return index;
}
}
- (CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section{
return 44;
}
//分区标题
-(NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section
{
if ([self.contentArrs[section] count] == 0) {
return nil;
}else{
return [self.sectionTitles objectAtIndex:section];
}
}
//索引标题
-(NSArray *)sectionIndexTitlesForTableView:(UITableView *)tableView
{
return self.sectionTitles;
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end