KVC （key value coding）键值编码
先定义两个类，person，dog
1 @interface Dog : NSObject 2 @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 //实例化两个person 2 Person *p = [[Person alloc]init]; 3 Person *p1= [[Person alloc]init]; 4 //实例化dog 5 Dog *d = [[Dog alloc] init]; 6 p.dog = d; 7 8 NSArray *pArray = @[p,p1]; 9 10 11 // 1.给p.name赋值 12 [p setValue:@"Tom" forKey:@"name"]; 13 14 // 2.用字典给p的属性赋值,类的属性必须在字典中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.按照键值路径赋值 23 [p setValue:@"fuck" forKeyPath:@"dog.dogName"]; 24 25 // 4.KVC按照键值路径取值时，如果对象不包含指定的键值，会自动进入对象内部，查找对象属性 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);
输出结果：2014-05-25 19:49:26.634 xcode 小技巧- 自定义代码块[832:303] (
Jack,
Cruise
)
2014-05-25 19:49:26.641 xcode 小技巧- 自定义代码块[832:303] <Person: 0x100202d50> ,name= Jack,age = 10,phone = 24234232,dogname = fuck