1 // 2 //  Car.h 3 //  01-CarBrand 4 // 5 //  Created by hellovoidworld on 14/11/30. 6 //  Copyright (c) 2014年 hellovoidworld. All rights reserved. 7 // 8  9 #import <Foundation/Foundation.h>10 11 @interface Car : NSObject12 13 @property(nonatomic, strong) NSArray *cars;14 @property(nonatomic, copy) NSString *title;15 @property(nonatomic, copy) NSString *desc;16 17 - (instancetype) initWithDictionary:(NSDictionary *) dictionary;18 + (instancetype) carWithDictionary:(NSDictionary *) dictionary;19 + (instancetype) car;20 21 @end

 1 // 2 //  Car.m 3 //  01-CarBrand 4 // 5 //  Created by hellovoidworld on 14/11/30. 6 //  Copyright (c) 2014年 hellovoidworld. All rights reserved. 7 // 8  9 #import "Car.h"10 11 @implementation Car12 13 - (instancetype) initWithDictionary:(NSDictionary *) dictionary {14     if (self == [super init]) {15         self.cars = dictionary[@"cars"];16         self.title = dictionary[@"title"];17         self.desc = dictionary[@"desc"];18     }19    20     return self;21 }22 23 + (instancetype) carWithDictionary:(NSDictionary *) dictionary {24     return [[self alloc] initWithDictionary:dictionary];25 }26 27 + (instancetype) car {28     return [self carWithDictionary:nil];29 }30 31 @end

 1 // 2 //  ViewController.m 3 //  01-CarBrand 4 // 5 //  Created by hellovoidworld on 14/11/30. 6 //  Copyright (c) 2014年 hellovoidworld. All rights reserved. 7 // 8  9 #import "ViewController.h"10 #import "Car.h"11 12 @interface ViewController () <UITableViewDataSource>13 14 @property (weak, nonatomic) IBOutlet UITableView *tableView;15 16 @property(nonatomic, strong) NSArray *allBrandOfCars;17 18 @end19 20 @implementation ViewController21 22 - (void)viewDidLoad {23     [super viewDidLoad];24     // Do any additional setup after loading the view, typically from a nib.25    26     self.tableView.dataSource = self;27 }28 29 - (void)didReceiveMemoryWarning {30     [super didReceiveMemoryWarning];31     // Dispose of any resources that can be recreated.32 }33 34 35 #pragma mark - dataSource方法36 37 /** Sections 数，组数 */38 - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {39     return self.allBrandOfCars.count; // 所有车的派系的数量40 }41 42 /** 组内的行数 */43 - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {44     Car *car = self.allBrandOfCars[section];45     return car.cars.count; // 每个派系的车的牌子的数量46 }47 48 /** 组的标题49 这里是车的派系50 */51 - (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section {52     Car *car = self.allBrandOfCars[section];53     return  car.title;54 }55 56 /** 组的尾部 */57 - (NSString *)tableView:(UITableView *)tableView titleForFooterInSection:(NSInteger)section {58     Car *car = self.allBrandOfCars[section];59     return  car.desc;60 }61 62 /** 行的内容 */63 - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {64     UITableViewCell *cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:nil];65    66     Car *car = self.allBrandOfCars[indexPath.section]; // 车的派系67     NSString *carName = car.cars[indexPath.row]; // 具体车的牌子68    69     cell.textLabel.text = carName;70    71     return  cell;72 }73 74 75 /** 延迟加载plist文件中的数据 */76 - (NSArray *) allBrandOfCars {77     if (nil == _allBrandOfCars) {78         NSArray *dictArray = [NSArray arrayWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"cars_simple" ofType:@"plist"]];79        80         NSMutableArray *mdictArray = [NSMutableArray array];81         for (NSDictionary *dict in dictArray) {82             Car *car = [Car carWithDictionary:dict];83             [mdictArray addObject:car];84         }85        86         _allBrandOfCars = mdictArray;87     }88 89     return _allBrandOfCars;90 }91 92 93 @end