KVC

KVC:键值编码

赋值有各种各样的方式,点语法,KVC......

KVC的核心功能 : 修改类中的私有属性

创建一个Person类,私有属性_personAge

@interface Person : NSObject

{

    @private

    int _personAge;

}

//姓名,体重,狗

@property(nonatomic, copy) NSString *name;

@property(nonatomic,assign)int weight;

@property(nonatomic, strong) Dog *dog;

-(void)loagAge;

@end

-(void)loagAge{

    NSLog(@"age = %d",_personAge);

}

创建一条狗

@interface Dog : NSObject

@property(nonatomic, copy) NSString *name;

@property(nonatomic,assign)int  dogAge;

@end

简单编写:

self.p = [[Person alloc]init];

self.d = [[Dog alloc]init];

self.p.dog = self.d;

//通过KVC的方式给Person和Dog的属性赋值

//Person name

[self.p setValue:@"小明" forKeyPath:@"name"];

NSLog(@"self.p = %@",self.p.name);

//Person 私有属性_age

[self.p setValue:@18 forKeyPath:@"personAge"];

[self.p loagAge];

[self.p setValue:@"dog" forKeyPath:@"dog.name"];

NSLog(@"self.d = %@",self.d.name);

输出结果:

self.p = 小明

age = 18

self.d = dog