iOS多态 动态绑定

多态和动态绑定是为了解决父类调用子类的问题

　　首先，声明三个类aa bb cc 都继承于fist类

#import <Foundation/Foundation.h>

@interface fist : NSObject

{

SEL name;

}

-(void)print;

@end

@implementation fist

-(void)print

{

NSLog(@"我是aa");

}

@end

@interface aa : fist

-(void)nihao;

@end

@implementation aa

-(void)nihao

{

NSLog(@"buhdddddddddao");

}

@end

@interface bb : fist

-(void)nihao;

@end

@implementation bb

-(void)nihao

{

NSLog(@"我是bb");

}

@end

@interface cc : aa

-(void)nihao;

@end

@implementation cc

-(void)nihao

{

NSLog(@"我是cc");

}

@end

int main(int argc, const char * argv[])

{

@autoreleasepool {

aa *a=[[aa alloc] init];//声明aa的对象

bb *b=[[bb alloc] init]; ／／'''

cc *c=[[cc alloc] init];

fist *dd[3]={a,b,c};//可以用父类  id 或者NSobject

　　for (int i=0; i<3; i++) {

　            SEL gong;

gong=@selector(nihao);//定一个选择器

if ([dd[i] respondsToSelector:gong]==YES) {／／逐个遍历出来

[dd[i] performSelector:gong];

[dd[i] release];

　　   }

}

}

}

return 0;

}