通讯录

#import "ContactViewController.h"//通讯录: 最外面是字典, key(A,B,C...) - keyArray ; value(数组(image1,name1; image2, name2; ...), 可见每个元素都是字典)@interface ContactViewController ()<UITableViewDataSource>@property (nonatomic, copy)NSDictionary *contactDic;@property (nonatomic, copy)NSArray *keyArray;//装key 值的数组@endstatic NSString *identifier = @"abc";@implementation ContactViewController- (void)dealloc{    [_keyArray release];    [_contactDic release];    [super dealloc];}- (void)viewDidLoad {    [super viewDidLoad];    // Do any additional setup after loading the view.    UITableView *tabView = [[UITableView alloc] initWithFrame:[UIScreen mainScreen].bounds style:UITableViewStylePlain];    [self.view addSubview:tabView];    tabView.dataSource = self;    [tabView registerClass:[UITableViewCell class] forCellReuseIdentifier:identifier];    [tabView release];    NSString *path = [[NSBundle mainBundle] pathForResource:@"Contact" ofType:@"plist"];    self.contactDic = [NSDictionary dictionaryWithContentsOfFile:path];    //数组排序(A, B, C, D...)    self.keyArray = [self.contactDic.allKeys sortedArrayUsingSelector:@selector(compare:)];}- (void)didReceiveMemoryWarning {    [super didReceiveMemoryWarning];    // Dispose of any resources that can be recreated.}#pragma mark - UITableViewDataSource//多少分区- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {    return self.keyArray.count;}//多少行- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {    NSString *key = self.keyArray[section];    NSArray *array = self.contactDic[key];    return array.count;}//单元格- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:identifier forIndexPath:indexPath];    NSString *key = self.keyArray[indexPath.section];//获取到 key 值    NSArray *array = self.contactDic[key];// 根据 key 值, 找到数组    //数组的 key, 数组的 value    NSDictionary *dic = array[indexPath.row];//数组里面的具体某个元素    cell.imageView.image = [UIImage imageNamed:dic[@"image"]];    cell.textLabel.text = dic[@"name"];    return cell;}//分区数组- (nullable NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section {    return self.keyArray[section];}//右边的- (nullable NSArray<NSString *> *)sectionIndexTitlesForTableView:(UITableView *)tableView  {    return self.keyArray;}@end