1 @interface Dog : NSObject2 @PRoperty (nonatomic,copy) NSString *name;3 @end

 1 #import <Foundation/Foundation.h> 2 @class Dog; 3  4 @interface Person : NSObject 5 @property (nonatomic,copy) NSString *name; 6 @property (nonatomic,assign) int age; 7 @property (nonatomic,copy) NSString *phone; 8 @property (nonatomic,strong) Dog *dog; 9 10 @end

 1   //實例化兩個person 2         Person *p = [[Person alloc]init]; 3         Person *p1= [[Person alloc]init]; 4         //實例化dog 5         Dog *d = [[Dog alloc] init]; 6         p.dog = d; 7          8         NSArray *pArray = @[p,p1]; 9         10 11         // 1.給p.name賦值12         [p setValue:@"Tom" forKey:@"name"];13         14         // 2.用字典給p的屬性賦值,類的屬性必須在字典中key存在，可以比字典中得key多，但是不能少。15         [p setValuesForKeysWithDictionary:@{@"name":@"Jack",@"age":@10,@"phone":@"24234232"}];16         17         NSDictionary *dict = @{@"name":@"Cruise",@"age":@12,@"phone":@"123214wrew"};18         19         [p1 setValuesForKeysWithDictionary:dict];20         21        22         // 3.按照鍵值路徑賦值23         [p setValue:@"fuck" forKeyPath:@"dog.dogName"];24         25         // 4.KVC按照鍵值路徑取值時，如果對象不包含指定的鍵值，會自動進入對象內部，查找對象屬性26         NSArray *a = [pArray valueForKeyPath:@"name"];27         28         NSLog(@"%@",a);29         30         NSLog(@"%@ ,name= %@,age = %d,phone = %@,dogname = %@",p,p.name,p.age,p.phone,p.dog.dogName);