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;
}