Objective-C 反射
acount.h
// // Acount.h // KenshinCui // // Created by hxd_mac on 15-6-9. // Copyright (c) 2015年 hxd198. All rights reserved. // #import <Foundation/Foundation.h> @interface Acount : NSObject @property (nonatomic, assign) double balance; @end
acount.m
// // Acount.m // KenshinCui // // Created by hxd_mac on 15-6-9. // Copyright (c) 2015年 hxd198. All rights reserved. // #import "Acount.h" @implementation Acount @end
person.h
// // Person.h // KenshinCui // // Created by hxd_mac on 15-6-9. // Copyright (c) 2015年 hxd198. All rights reserved. // #import <Foundation/Foundation.h> @class Acount; @interface Person : NSObject @property (nonatomic, copy) NSString *name; @property (nonatomic, assign) Acount *acount; - (Person *) initWithName : (NSString *) name; + (Person *) personWithName : (NSString *) name; - (void) showMessage : (NSString *) information; - (NSComparisonResult ) comparePerson : (Person *) person; @end
person.m
//
// Person.m
// KenshinCui
//
// Created by hxd_mac on 15-6-9.
// Copyright (c) 2015年 hxd198. All rights reserved.
//
#import "Person.h"
@implementation Person
- (Person *) initWithName:(NSString *)name
{
if (self = [super init]) {
self.name = name;
}
return (self);
}
+ (Person *) personWithName:(NSString *)name
{
Person *person = [[Person alloc] initWithName:name];
return person;
}
- (void) showMessage:(NSString *)information
{
NSLog(@"my name is %@, the imformation is %@", _name, information);
}
- (NSComparisonResult) comparePerson:(Person *)person
{
return [_name compare:person.name];
}
- (NSString *) description
{
return [NSString stringWithFormat:@"name = %@", _name];
}
@end
main.m
//
// main.m
// KenshinCui
//
// Created by hxd_mac on 15-6-7.
// Copyright (c) 2015年 hxd198. All rights reserved.
//
#import <Foundation/Foundation.h>
#import "Person.h"
int main(int argc, const char * argv[])
{
@autoreleasepool {
/*常用方法*/
Person *person1=[Person personWithName:@"Kenshin"];
NSLog(@"%i",[person1 isKindOfClass:[NSObject class]]); //判断一个对象是否为某种类型（如果是父类也返回YES），结果：1
NSLog(@"%i",[person1 isMemberOfClass:[NSObject class]]); //判断一个对象是否是某个类的实例化对象，结果：0
NSLog(@"%i",[person1 isMemberOfClass:[Person class]]); //结果：1
NSLog(@"%i",[person1 conformsToProtocol:@protocol(NSCopying)]);//是否实现了某个协议，结果：0
NSLog(@"%i",[person1 respondsToSelector:@selector(showMessage:)]);//是否存在某个方法，结果：1
[person1 showMessage:@"Hello,world!"];//直接调用一个方法
[person1 performSelector:@selector(showMessage:) withObject:@"Hello,world!"];
//动态调用一个方法，注意如果有参数那么参数类型只能为ObjC对象，并且最多只能有两个参数
/*反射*/
//动态生成一个类
NSString *className=@"Person";
Class myClass=NSClassFromString(className);//根据类名生成类
Person *person2=[[myClass alloc]init]; //实例化
person2.name=@"Kaoru";
NSLog(@"%@",person2);//结果：name=Kaoru
//类转化为字符串
NSLog(@"%@,%@",NSStringFromClass(myClass),NSStringFromClass([Person class])); //结果：Person,Person
//调用方法
NSString *methodName=@"showMessage:";
SEL mySelector=NSSelectorFromString(methodName);
Person *person3=[[myClass alloc]init];
person3.name=@"Rosa";
[person3 performSelector:mySelector withObject:@"Hello,world!"]; //结果：My name is Rosa,the infomation is "Hello,world!".
//方法转化为字符串
NSLog(@"%@",NSStringFromSelector(mySelector)); //结果：showMessage:
}
return 0;
}
输出结果：
2015-06-09 21:43:20.202 KenshinCui[490:303] 1
2015-06-09 21:43:20.238 KenshinCui[490:303] 0
2015-06-09 21:43:20.240 KenshinCui[490:303] 1
2015-06-09 21:43:20.241 KenshinCui[490:303] 0
2015-06-09 21:43:20.243 KenshinCui[490:303] 1
2015-06-09 21:43:20.246 KenshinCui[490:303] my name is Kenshin, the imformation is Hello,world!
2015-06-09 21:43:20.248 KenshinCui[490:303] my name is Kenshin, the imformation is Hello,world!
2015-06-09 21:43:20.249 KenshinCui[490:303] name = Kaoru
2015-06-09 21:43:20.251 KenshinCui[490:303] Person,Person
2015-06-09 21:43:20.253 KenshinCui[490:303] my name is Rosa, the imformation is Hello,world!
2015-06-09 21:43:20.254 KenshinCui[490:303] showMessage: