[iOS基础控件

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

@property(nonatomic, strong) NSArray *cars;

 

封装Model的时候需要进行相应处理

CarGroup.m

        // 这里不能用KVC，封装car model再放到array中，不能直接存储array
        NSArray *carsArray = dictionary[@"cars"];
        NSMutableArray *mcarsArray = [NSMutableArray array];
        for (NSDictionary *dict in carsArray) {
            Car *car = [Car carWithDictionary:dict];
            [mcarsArray addObject:car];
        }
      
        self.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

Car.m
- (instancetype) initWithDictionary:(NSDictionary *) dictionary {
    if (self = [super init]) {
        // 当dictionary中的键名跟Model中的成员名一致的时候，可以使用KVC
        [self setValuesForKeysWithDictionary:dictionary];
       
//        self.icon = dictionary[@"icon"];
//        self.name = dictionary[@"name"];
    }
   
    return self;
}
 

3.展示标题 setTitle

/** 设置section头部标题 */
- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section

 

4.索引

/** 索引 */
- (NSArray *)sectionIndexTitlesForTableView:(UITableView *)tableView {
    // 使用KVC取出数组，不用使用遍历封装
    return [self.carGroups valueForKey:@"title"];
}

 

C.主要代码

//
//  Car.h
//  CarGroup
//
//  Created by hellovoidworld on 14/12/2.
//  Copyright (c) 2014年 hellovoidworld. All rights reserved.
//

#import <Foundation/Foundation.h>

@interface Car : NSObject

@property(nonatomic, copy) NSString *icon;
@property(nonatomic, copy) NSString *name;

- (instancetype) initWithDictionary:(NSDictionary *) dictionary;
+ (instancetype) carWithDictionary:(NSDictionary *) dictionary;
+ (instancetype) car;

@end

//
//  Car.m
//  CarGroup
//
//  Created by hellovoidworld on 14/12/2.
//  Copyright (c) 2014年 hellovoidworld. All rights reserved.
//

#import "Car.h"

@implementation Car

- (instancetype) initWithDictionary:(NSDictionary *) dictionary {
    if (self = [super init]) {
        // 当dictionary中的键名跟Model中的成员名一致的时候，可以使用KVC
        [self setValuesForKeysWithDictionary:dictionary];
       
//        self.icon = dictionary[@"icon"];
//        self.name = dictionary[@"name"];
    }
   
    return self;
}

+ (instancetype) carWithDictionary:(NSDictionary *) dictionary {
    return [[self alloc] initWithDictionary:dictionary];
}

+ (instancetype) car {
    return [self carWithDictionary:nil];
}

@end

 

//
//  CarGroup.h
//  CarGroup
//
//  Created by hellovoidworld on 14/12/2.
//  Copyright (c) 2014年 hellovoidworld. All rights reserved.
//

#import <Foundation/Foundation.h>

@interface CarGroup : NSObject

@property(nonatomic, strong) NSArray *cars;
@property(nonatomic, copy) NSString *title;

- (instancetype) initWithDictionary:(NSDictionary *) dictionary;
+ (instancetype) carGroupWithDictionary:(NSDictionary *) dictionary;
+ (instancetype) carGroup;

@end

 

//
//  CarGroup.m
//  CarGroup
//
//  Created by hellovoidworld on 14/12/2.
//  Copyright (c) 2014年 hellovoidworld. All rights reserved.
//

#import "CarGroup.h"
#import "Car.h"

@implementation CarGroup

- (instancetype) initWithDictionary:(NSDictionary *) dictionary {
    if (self = [super init]) {
        self.title = dictionary[@"title"];
       
        // 这里不能用KVC，封装car model再放到array中，不能直接存储array
        NSArray *carsArray = dictionary[@"cars"];
        NSMutableArray *mcarsArray = [NSMutableArray array];
        for (NSDictionary *dict in carsArray) {
            Car *car = [Car carWithDictionary:dict];
            [mcarsArray addObject:car];
        }
       
        self.cars = mcarsArray;
    }
   
    return self;
}

+ (instancetype) carGroupWithDictionary:(NSDictionary *) dictionary {
    return [[self alloc] initWithDictionary:dictionary];
}

+ (instancetype) carGroup {
    return [self carGroupWithDictionary:nil];
}

@end

 

//
//  ViewController.m
//  CarGroup
//
//  Created by hellovoidworld on 14/12/1.
//  Copyright (c) 2014年 hellovoidworld. All rights reserved.
//

#import "ViewController.h"
#import "CarGroup.h"
#import "Car.h"

@interface ViewController () <UITableViewDataSource>
@property (weak, nonatomic) IBOutlet UITableView *tableView;

// 所有的车品牌
@property(nonatomic, strong) NSArray *carGroups;

@end