//
// 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;
}
转载于:https://www.cnblogs.com/0515offer/p/4581203.html
