由于项目需要制作一个通讯录，于是就研究了一下，不足之处还请指教： #import "ViewController.h" @interface ViewController ()<UITableViewDelegate,UITableViewDataSource> @property (nonatomic,strong) NSMutableDictionary *nameDic; @property (nonatomic,strong) NSMutableDictionary *numdic; @end @implementation ViewController - (void)viewDidLoad { [super viewDidLoad]; NSArray *names = @[@"张三",@"李四",@"王麻子",@"王五",@"刘备",@"张飞",@"关羽",@"刘玉婵",@"吕布",@"诸葛老神仙",@"陈二狗",@"曹蒹葭",@"白马探花"]; NSArray *nums = @[@"张三1",@"李四2",@"王麻子3",@"王五4",@"刘备5",@"张飞6",@"关羽7",@"刘玉婵4",@"吕布8",@"诸葛老神仙8",@"陈二狗3",@"曹蒹葭2",@"白马探花1"]; NSMutableDictionary *dic = [NSMutableDictionary dictionary]; for ( int i = 0; i<names.count; i++) { [dic setValue:nums[i] forKey:names[i]]; } self.numdic = dic; UITableView *tableView = [[UITableView alloc]initWithFrame:[UIScreen mainScreen].bounds]; [tableView setSeparatorStyle:UITableViewCellSeparatorStyleNone]; [tableView registerClass:[UITableViewCell class] forCellReuseIdentifier:@"cell"]; tableView.delegate = self; tableView.dataSource = self; [self.view addSubview:tableView]; for (NSString *name in names) { //获取汉子的首字母 //把中文转拼音 NSMutableString *ms = [[NSMutableString alloc] initWithString:name]; if (CFStringTransform((__bridge CFMutableStringRef)ms, 0, kCFStringTransformMandarinLatin, NO)) { NSLog(@"Pingying: %@", ms); } if (CFStringTransform((__bridge CFMutableStringRef)ms, 0, kCFStringTransformStripDiacritics, NO)) { NSLog(@"Pingying: %@", ms); } NSString *firstString = [ms substringToIndex:1]; // NSLog(@"%@--%@--%@",cityName,ms,[ms substringToIndex:1]); NSMutableArray * arr = [self.nameDic objectForKey:firstString]; if (arr) { [arr addObject:name]; }else{//如果没有 则需要创建一个添加到里面 [self.nameDic setObject:[@[name] mutableCopy] forKey:firstString]; } } } - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView{ return self.nameDic.count; } - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{ //对数组中的字符串进行排序 NSArray *keys = [self.nameDic.allKeys sortedArrayUsingSelector:@selector(compare:)]; NSString *key = keys[section]; NSArray *citys = self.nameDic[key]; return citys.count; } - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{ UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"cell" forIndexPath:indexPath]; NSArray *keys = [self.nameDic.allKeys sortedArrayUsingSelector:@selector(compare:)]; NSString *key = keys[indexPath.section]; NSArray *citys = self.nameDic[key]; cell.textLabel.numberOfLines = 0; cell.textLabel.text = [NSString stringWithFormat:@"名字:%@ \n 电话：%@ ", citys[indexPath.row],self.numdic[citys[indexPath.row]]]; return cell; } -(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath{ return 50; } //控制有没有索引 - (nullable NSArray<NSString *> *)sectionIndexTitlesForTableView:(UITableView *)tableView{ NSArray *keys = [self.nameDic.allKeys sortedArrayUsingSelector:@selector(compare:)]; return keys; } - (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section{ NSArray *keys = [self.nameDic.allKeys sortedArrayUsingSelector:@selector(compare:)]; return keys[section]; } -(NSMutableDictionary *)nameDic{ if (_nameDic == nil) { _nameDic = [NSMutableDictionary dictionary]; } return _nameDic; } @end
这就是我所写demo的全部内容。效果如图
