iOS设计模式--原型模式

一：原理实质

1 原型模式 ：用原型实例指定创建对象的种类，并且通过拷贝这些原型创建新的对象。

2 原型模式实质：其实就是从一个对象在创建另外一个可定制的对象，而且不需要知道任何创建的细节。

二 copy 与mutableCopy的实质

浅拷贝：直接复制数组指针

具体代码：

Animal.h

//
//  Animal.h
//  原型模式demo
//
//  Created by Apple on 16/3/8.
//  Copyright © 2016年 liuYuGang. All rights reserved.
//

#import <Foundation/Foundation.h>

@interface Animal : NSObject<NSCopying,NSMutableCopying>
@property(nonatomic,copy)NSMutableString *name;
@property (nonatomic,copy)NSString *desciption;
@property (nonatomic,assign)CGFloat weight;
-(instancetype)initWithName:(NSMutableString *)name desciption:(NSString *)des weight:(CGFloat)
weight;
@end

Animal.m

//
//  Animal.m
//  原型模式demo
//
//  Created by Apple on 16/3/8.
//  Copyright © 2016年 liuYuGang. All rights reserved.
//

#import "Animal.h"

@implementation Animal
-(instancetype)initWithName:(NSMutableString *)name desciption:(NSString *)des weight:(CGFloat)
weight{
if (self = [super init]) {
self.name = name;
self.desciption =des;
self.weight = weight;

}
return self;
}

-(id)copyWithZone:(NSZone *)zone{
Animal *animal = [[self class]allocWithZone:zone];
animal.name = [self.name mutableCopy];
animal.desciption = [self.desciption copy];
animal.weight = self.weight;
return animal;
}

-(id)mutableCopyWithZone:(NSZone *)zone{
Animal *animal = [[self class]allocWithZone:zone];
animal.name = [self.name mutableCopy];
animal.desciption = [self.desciption copy];
animal.weight = self.weight;
return animal;
}

@end

main.m

//
//  main.m
//  原型模式demo
//
//  Created by Apple on 16/3/8.
//  Copyright © 2016年 liuYuGang. All rights reserved.
//

#import <Foundation/Foundation.h>
#import "Animal.h"

int main(int argc, const char * argv[]) {
NSMutableString *n = [NSMutableString stringWithFormat:@"��"];
Animal *animl = [[Animal alloc]initWithName:n desciption:@"这是一只猫" weight:12.0];
Animal *animal1 = [animl copy];
NSLog(@"name=%@",animal1.name);
Animal *animal2 = [animl mutableCopy];
NSLog(@"descirption=%@",animal2.desciption);
return 0;
}

运行结果：



代码下载地址：http://pan.baidu.com/s/1dDRmypr