OC3_选择器

//

//  Dog.h

//  OC3_选择器

//

//  Created by zhangxueming on 15/6/16.

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

//



#import <Foundation/Foundation.h>



@interface Dog : NSObject



@property (copy)NSString *name;

@property (assign,nonatomic)NSInteger age;



- (void)bark:(NSNumber *)count;



@end

//

//  Dog.m

//  OC3_选择器

//

//  Created by zhangxueming on 15/6/16.

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

//



#import "Dog.h"



@implementation Dog



- (void)bark:(NSNumber *)count

{

    NSInteger  cnt = [count integerValue];

    for (NSInteger i=0; i<cnt; i++) {

        NSLog(@"Wang wang wang ...");

    }

}



@end

//

//  main.m

//  OC3_选择器

//

//  Created by zhangxueming on 15/6/16.

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

//



#import <Foundation/Foundation.h>

#import "Dog.h"



//函数指针变量



int add(int a, int b)

{

    return a+b;

}

//选择器

//运行层次概念

//sel



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

    @autoreleasepool {

        int (*pfunc)(int, int) = add;

        NSLog(@"add = %d", pfunc(3,5));

        

        Dog *xiaoBai = [[Dog alloc] init];

        //[xiaoBai bark:[NSNumber numberWithInt:4]];

        

        //1.利用@selector关键字生成选择器

#pragma clang diagnostic push

#pragma clang diagnostic ignored "-Warc-performSelector-leaks"

        //方法一:

        //SEL select = @selector(bark:);

        //方法二:

        //利用方法名的字符串对象生成选择器

        SEL select = NSSelectorFromString(@"bark:");

        //方法三:

        //利用C语言的字符串生成选择器

        //SEL select = sel_getUid("bark:");

        

        //获取选择器中保存的方法名

        NSLog(@"%s", sel_getName(select));

        NSLog(@"%@", NSStringFromSelector(select));

        

        //NSLog(@"%p", select);

        //判断对象所在的类是否实现选择器中的方法

        if([xiaoBai respondsToSelector:select])

        {

            //执行选择器中保存的方法

            //[xiaoBai performSelector:select withObject:[NSNumber numberWithInteger:10]];

            [xiaoBai bark:[NSNumber numberWithInteger:10]];

        }

#pragma clang diagnostic pop

    }

    return 0;

}