#import <Foundation/Foundation.h> 
 
 
@interface Sample : NSObject { 
 
  SEL action; 
  id target; 
   
} 
@property SEL action; 
@property (assign) id target; 
 
-(void)addTarget:(id) t action:(SEL) s; 
-(void)sample_dosomthing; 
 
@end 

#import "Sample.h" 
 
 
@implementation Sample 
 
@synthesize action; 
@synthesize target; 
 
 
-(void)dealloc{ 
  target = nil; 
  [super dealloc]; 
} 
 
-(void)addTarget:(id) t action:(SEL) s{ 
  self.action = s; 
  self.target = t; 
} 
 
 
-(void)sample_dosomthing{ 
   
  [self.target performSelector:self.action]; 
} 
 
@end 

-(void)control_dosomthing{ 
  NSLog(@"control_dosomthing"); 
} 
 
- (void)viewDidLoad { 
  [super viewDidLoad]; 
   
  Sample *sample1 = [Sample new]; 
  [sample1 addTarget:self action:@selector(control_dosomthing)]; 
}