标签:反射机制 object c class iskindofclass ismemberofclass
Object-C 也提供了类似Java的反射机制。通过以下三种方式与运行环境交互:
1、直接通过Object-C源代码
2、通过NSObject中定义的方法:
isKindOfClass
isMemberOfClass
responseToSelector:判断该实例是否调用指定方法
3、直接调用运行时函数进行动态编程
#import
<Foundation/Foundation.h>
#import
"DCApple.h"
int
main(int
argc,
const
char * argv[]) {
@autoreleasepool {
// insert code here...
NSLog(@"Hello, World!");
//
通过字符串来获取Class
Class clazz =
NSClassFromString(@"NSDate");
NSLog(@"%@"
, clazz);
//
直接使用Class来创建对象
id date = [[clazz
alloc]
init];
NSLog(@"%@"
, date);
//
通过对象来获取Class
NSLog(@"%@"
, [date
class]);
//
通过类来获取class
NSLog(@"%d"
, clazz ==
NSDate.class);
}
return
0;
}
===>>
2014-12-01 09:06:25.916 reflection[1179:303] Hello, World!
2014-12-01 09:06:25.917 reflection[1179:303] NSDate
2014-12-01 09:06:25.924 reflection[1179:303] 2014-12-01 01:06:25 +0000
2014-12-01 09:06:25.925 reflection[1179:303] __NSDate
2014-12-01 09:06:25.925 reflection[1179:303] 1
Program ended with exit code: 0
检查继承关系
conformsToProtocol:传入一个Protocol 参数,用于判断该类及其子类的实例。
//
// main.m
// reflection
//
// Created by mac on 14-12-1.
// Copyright (c) 2014年
mac. All rights reserved.
//
#import
<Foundation/Foundation.h>
#import
"DCApple.h"
int
main(int
argc,
const
char * argv[]) {
@autoreleasepool {
//
判断对象是否为某个类及其子类的实例
NSLog(@"app是否为DCApple及其子类的实例:%d",
[app
isKindOfClass:
DCApple.class]);
NSLog(@"app是否为NSObject及其子类的实例:%d",
[app
isKindOfClass:
NSObject.class]);
NSLog(@"app2是否为DCApple及其子类的实例:%d",
[app2
isKindOfClass:
DCApple.class]);
NSLog(@"app2是否为NSObject及其子类的实例:%d",
[app2
isKindOfClass:
NSObject.class]);
//
判断对象是否实现了指定协议
NSLog(@"app是否实现DCEatable协议:%d",
[app
conformsToProtocol:
@protocol(DCEatable)]);
NSLog(@"app2是否实现了DCEatable协议:%d",[app2
conformsToProtocol:
@protocol(DCEatable)]);
}
return
0;
}
=====>>
2014-12-01 14:07:26.220 reflection[2195:303] DCApple
2014-12-01 14:07:26.220 reflection[2195:303] DCApple1
2014-12-01 14:07:26.221 reflection[2195:303] app是否为DCApple的实例:1
2014-12-01 14:07:26.221 reflection[2195:303] app是否为NSObject的实例:0
2014-12-01 14:07:26.222 reflection[2195:303] app2是否为NSObject的实例:0
2014-12-01 14:07:26.222 reflection[2195:303] app2是否为DCApple的实例:0
2014-12-01 14:07:26.223 reflection[2195:303] app2是否为DCApple的实例:1
2014-12-01 14:07:26.223 reflection[2195:303] app是否为DCApple及其子类的实例:1
2014-12-01 14:07:26.224 reflection[2195:303] app是否为NSObject及其子类的实例:1
2014-12-01 14:07:26.224 reflection[2195:303] app2是否为DCApple及其子类的实例:1
2014-12-01 14:07:26.225 reflection[2195:303] app2是否为NSObject及其子类的实例:1
2014-12-01 14:07:26.225 reflection[2195:303] app是否实现DCEatable协议:1
2014-12-01 14:07:26.225 reflection[2195:303] app2是否实现了DCEatable协议:1
Program ended with exit code: 0
【Object C】 反射机制
标签:反射机制 object c class iskindofclass ismemberofclass
原文地址:http://blog.csdn.net/sinat_15735647/article/details/41680805