A.需求
1.使用汽车品牌名称头字母为一个Model，汽车品牌为一个Model，头字母Model嵌套品牌Model
2.使用KVC进行Model封装赋值
3.展示头字母标题
4.展示索引（使用KVC代替遍历取出所有索引值）
B.实现
1.Model嵌套
其实就是将另一个Model作为成员
.plist 文件结构
GroupCar中有存储Car的数组
1@PRoperty(nonatomic, strong) NSArray *cars;
封装Model的时候需要进行相应处理
CarGroup.m
1//这里不能用KVC，封装car model再放到array中，不能直接存储array2NSArray *carsArray = dictionary[@"cars"];3NSMutableArray *mcarsArray =[NSMutableArray array];4for(NSDictionary *dictincarsArray) {5Car *car =[Car carWithDictionary:dict];6[mcarsArray addObject:car];7}89self.cars = mcarsArray;
2.KVC
成员名使用和从dictionary取出来的键名一致，从而能用一个方法赋值所有成员属性，所见代码量
1Car.m2- (instancetype) initWithDictionary:(NSDictionary *) dictionary {3if(self =[super init]) {4//当dictionary中的键名跟Model中的成员名一致的时候，可以使用KVC5[self setValuesForKeysWithDictionary:dictionary];67//self.icon = dictionary[@"icon"];8//self.name = dictionary[@"name"];9}1011returnself;12}13
3.展示标题 setTitle
1/** 设置section头部标题*/2- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section
4.索引
1/** 索引*/2- (NSArray *)sectionIndexTitlesForTableView:(UITableView *)tableView {3//使用KVC取出数组，不用使用遍历封装4return[self.carGroups valueForKey:@"title"];5}
C.主要代码
1//2//Car.h3//CarGroup4//5//Created by hellovoidworld on 14/12/2.6//Copyright (c) 2014年 hellovoidworld. All rights reserved.7//89#import<Foundation/Foundation.h>1011@interfaceCar : NSObject1213@property(nonatomic, copy) NSString *icon;14@property(nonatomic, copy) NSString *name;1516- (instancetype) initWithDictionary:(NSDictionary *) dictionary;17+ (instancetype) carWithDictionary:(NSDictionary *) dictionary;18+(instancetype) car;1920@end
1//2//Car.m3//CarGroup4//5//Created by hellovoidworld on 14/12/2.6//Copyright (c) 2014年 hellovoidworld. All rights reserved.7//89#import"Car.h"1011@implementationCar1213- (instancetype) initWithDictionary:(NSDictionary *) dictionary {14if(self =[super init]) {15//当dictionary中的键名跟Model中的成员名一致的时候，可以使用KVC16[self setValuesForKeysWithDictionary:dictionary];1718//self.icon = dictionary[@"icon"];19//self.name = dictionary[@"name"];20}2122returnself;23}2425+ (instancetype) carWithDictionary:(NSDictionary *) dictionary {26return[[self alloc] initWithDictionary:dictionary];27}2829+(instancetype) car {30return[self carWithDictionary:nil];31}3233@end
1//2//CarGroup.h3//CarGroup4//5//Created by hellovoidworld on 14/12/2.6//Copyright (c) 2014年 hellovoidworld. All rights reserved.7//89#import<Foundation/Foundation.h>1011@interfaceCarGroup : NSObject1213@property(nonatomic, strong) NSArray *cars;14@property(nonatomic, copy) NSString *title;1516- (instancetype) initWithDictionary:(NSDictionary *) dictionary;17+ (instancetype) carGroupWithDictionary:(NSDictionary *) dictionary;18+(instancetype) carGroup;1920@end
1//2//CarGroup.m3//CarGroup4//5//Created by hellovoidworld on 14/12/2.6//Copyright (c) 2014年 hellovoidworld. All rights reserved.7//89#import"CarGroup.h"10#import"Car.h"1112@implementationCarGroup1314- (instancetype) initWithDictionary:(NSDictionary *) dictionary {15if(self =[super init]) {16self.title = dictionary[@"title"];1718//这里不能用KVC，封装car model再放到array中，不能直接存储array19NSArray *carsArray = dictionary[@"cars"];20NSMutableArray *mcarsArray =[NSMutableArray array];21for(NSDictionary *dictincarsArray) {22Car *car =[Car carWithDictionary:dict];23[mcarsArray addObject:car];24}2526self.cars =mcarsArray;27}2829returnself;30}3132+ (instancetype) carGroupWithDictionary:(NSDictionary *) dictionary {33return[[self alloc] initWithDictionary:dictionary];34}3536+(instancetype) carGroup {37return[self carGroupWithDictionary:nil];38}3940@end
1//2//ViewController.m3//CarGroup4//5//Created by hellovoidworld on 14/12/1.6//Copyright (c) 2014年 hellovoidworld. All rights reserved.7//89#import"ViewController.h"10#import"CarGroup.h"11#import"Car.h"1213@interfaceViewController () <UITableViewDataSource>14@property (weak, nonatomic) IBOutlet UITableView *tableView;1516//所有的车品牌17@property(nonatomic, strong) NSArray *carGroups;1819@end