KVC （key value coding）键值编码
先定义两个类，person，dog
1@interfaceDog : NSObject2@PRoperty (nonatomic,copy) NSString *name;3@end
1#import<Foundation/Foundation.h>2@classDog;34@interfacePerson : NSObject5@property (nonatomic,copy) NSString *name;6@property (nonatomic,assign)intage;7@property (nonatomic,copy) NSString *phone;8@property (nonatomic,strong) Dog *dog;910@end
1//实例化两个person2Person *p =[[Person alloc]init];3Person *p1=[[Person alloc]init];4//实例化dog5Dog *d =[[Dog alloc] init];6p.dog =d;78NSArray *pArray =@[p,p1];91011//1.给p.name赋值12[p setValue:@"Tom"forKey:@"name"];1314//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"}];1617NSDictionary *dict = @{@"name":@"Cruise",@"age":@12,@"phone":@"123214wrew"};1819[p1 setValuesForKeysWithDictionary:dict];202122//3.按照键值路径赋值23[p setValue:@"fuck"forKeyPath:@"dog.dogName"];2425//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26NSArray *a = [pArray valueForKeyPath:@"name"];2728NSLog(@"%@",a);2930NSLog(@"%@ ,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