07-self

#import <Foundation/Foundation.h>
/*
self可以在方法、set、get中使用。
*/

@interface Person : NSObject
{
    int _age;
}

- (void)setAge:(int)age;
- (int)age;
- (void)test;
@end

@implementation Person
- (void)setAge:(int)age
{
    // _age = age;
    self->_age = age;
}
- (int)age
{
    return self->_age;
}

- (void)test
{
    // self：指向了方向调用者,代表着当期对象
    int _age = 20;
    NSLog(@"Person的年龄是%d岁", self->_age);
}
@end

int main()
{
    Person *p = [Person new];
  
    [p setAge:10];
   
    [p test];
   
    return 0;
}