theboy的起居注

//省略大部分代码
#import "mydog.h"
@interface reddog : mydog{
 SEL say;
 IMP setFun;
 id dog[3];
 
}
- (void) doSometing;
- (void) says;

//省略大部分代码
#import "dog.h"
@implementation reddog
- (void) doSometing{
 dog[0]=[reddog new];
 say=@selector(says);
 sayFun=[dog[0] methodForSelector say];
 sayFun(dog[0],say);
}
- (void) says{
 NSLog("Hello Objective_c,wang wang!");
}

//省略大部分代码
main{
 
//...
 
  reddog *makeDog=[reddog new];
  [makeDog doSometing];//输出：狗叫声...
 //...
}