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;
}