//  Person.h

//  ios初体验

//

//  Created by wjy0916 on 15/9/22.

//  Copyright (c) 2015年 ios. All rights reserved.

#import <Foundation/Foundation.h>

@interface Person : NSObject

-(void) run;

@end

//  Person.m

//  ios初体验

//

//  Created by wjy0916 on 15/9/22.

//  Copyright (c) 2015年 ios. All rights reserved.

#import "Person.h"

@implementation Person

-(void) run{

    NSLog(@“Person——人在跑--------");

}

-(void)talk{

    NSLog(@"talk+++++++++++++++++");

}

@end

Teacher *t = [Teacher new];

SEL s1 = @selector(talk);

BOOL b = [t respondsToSelector:s1];

NSLog(@“++++++++++++++%d",b);

Teacher 类中无任何代码，仅仅继承了，Person类

此时b = 1;

用t响应方法play是报错。

//  Person.h

//  ios初体验

//

//  Created by wjy0916 on 15/9/22.

//  Copyright (c) 2015年 ios. All rights reserved.

#import <Foundation/Foundation.h>

@interface Person : NSObject

-(void) run;

@end

//  Person.m

//  ios初体验

//

//  Created by wjy0916 on 15/9/22.

//  Copyright (c) 2015年 ios. All rights reserved.

#import "Person.h"

@implementation Person

-(void) run{

    NSLog(@“Person——人在跑--------");

}

-(void)talk{

    NSLog(@"talk+++++++++++++++++");

}

@end

Teacher *t = [Teacher new];

SEL s1 = @selector(talk);

BOOL b = [t respondsToSelector:s1];

NSLog(@“++++++++++++++%d",b);

Teacher 类中无任何代码，仅仅继承了，Person类

此时b = 1;

用t响应方法play是报错。