KVC设计模式（给对象的属性赋值）

#import <Foundation/Foundation.h>
#import "dog.h"
#import "App.h"
#import "Person.h"
int main(int argc, const char * argv[]) {
    @autoreleasepool {
      
        // KVC 是一种设计模式，key - Value - Coding
        //
        
        dog * dogOne = [[dog alloc] init];
        
        dogOne.name = @"two dog";
        dogOne.age = 1;
//        dog.kind = 1;  会报错
        NSLog(@"----%@",dogOne);
        
        
        
        
        
        
        //keyValueCoding
        dog *dogTwo = [[dog  alloc] init];
        
        [dogTwo setValue:@"threeFat" forKey:@"name"];
        [dogTwo setValue:@2 forKey:@"age"];
        [dogTwo setValue:@"二哈"forKey:@"Kind"];
        
        NSLog(@"%@",dogTwo);
        
        
#warning 用KVC的时候需要注意一点，不要写错名字
        
        //给一个模型的多个属性进行赋值
        NSDictionary *dic = @{
                              @"applicationId": @"725879978",
                              @"slug": @"ridge-racer-slipstream",
                              @"name": @"山脊赛车：滑流",
                              @"releaseDate": @"2014-05-21",
                              @"version": @"2.1.0",
                              @"description": @"终极街机赛车游戏系列为您的 iOS  设备带来游戏机般的体验！利用低压气穴赶超你的对手并以 150 MPH 速度漂移过急弯！\r\n",
                              @"categoryId": @"0",
                              @"categoryName": @"全部",
                              @"iconUrl": @"http://photo.candou.com/i/114/db489f4affd6dea31910541bb015e2ae",
                              @"itunesUrl": @"https://itunes.apple.com/cn/app/ridge-racer-slipstream/id725879978?mt=8&amp;uo=4",
                              @"starCurrent": @"4.5",
                              @"releaseNotes": @"• 此版本解决了一些游戏崩溃问题。\n• 此应用程序被优化为 iPhone 4S, iPad 3, iPod Touch 5th gen 及以上 要求 IOS 7.0+\n• 修复了一些小错误。",
                              };
        
        
        //属性批量赋值
        App *app = [[App alloc] init];
//        
//        for (NSString *key in dic) {
//            
//            [app setValue:dic[key] forKey:key];
//            
//            
//        }
        [app setValuesForKeysWithDictionary:dic];
        
        NSLog(@"=======%@",app);
    }
    
    
    
#pragma mark ---pereson---
    
    Person *p = [[Person alloc] init];
    
    
    [p setValue:@"长亭外，古道边，芳草天" forKey:@"name"];
    
    //这个方法就是可以查找子模型的属性
    [p setValue: @"尼古丁"forKeyPath:@"dogThree.name"];
    
    [p setValue:@1 forKeyPath:@"dogThree.age"];
    
    [p setValue:@"哈士奇" forKeyPath:@"dogThree.Kind"];
    
    
    NSLog(@"%@",p);
    return 0;
}

dog类

#import <Foundation/Foundation.h>

@interface dog : NSObject
@property (nonatomic,copy)NSString*name;//名字
@property (nonatomic,assign)NSInteger age;//年龄

@property (nonatomic,copy,readonly)NSString *Kind; //品种
@end

#import "dog.h"

@implementation dog
- (NSString *)description{
    
    return [NSString stringWithFormat:@"---%@,2222%lu,3333%@",self.name,self.age,self.Kind];
}
@end

App类

#import <Foundation/Foundation.h>

@interface App : NSObject
@property (nonatomic,copy)NSString*name;
@property (nonatomic,copy)NSString*iconUrl;
@property (nonatomic,copy)NSString*releaseNotes;
@property (nonatomic,copy)NSString*desc;
@end

#import "App.h"

@implementation App

//属性赋值的时候，如果没有这个key  会触发这个方法
- (void)setValue:(id)value forUndefinedKey:(NSString *)key{
    
    NSLog(@"哦哦哦哦哦%@",key);
    
    //如果给未定义的description赋值，其实给desc赋值
    if ([key isEqualToString:@"description"]) {
        [self setValue:value forKey:@"desc"];
    }
}
- (NSString *)description{
    //return [NSString stringWithFormat:@"---%@,2222%lu,3333%@",self.name,self.age,self.Kind];
//    name;
//    iconUrl;
//   releaseNotes;
//   desc;
    return [NSString stringWithFormat:@"--%@,--%@,--%@,--%@,",self.name,self.iconUrl,self.releaseNotes,self.desc];
}

@end

#import <Foundation/Foundation.h>
#import "dog.h"
@interface Person : NSObject
@property (nonatomic,copy)NSString*name;
@property (nonatomic,strong)dog *dogThree;
@end

Person类

#import "Person.h"

@implementation Person
- (instancetype)init{
    self= [super init];
    if (self) {
        self.dogThree = [[dog alloc]init];
        
    }
    
    return self;
}
-(NSString *)description{
    
    return [NSString stringWithFormat:@"%@养了%@",self.name,self.dogThree];
    
}
@end