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  • 代理模式

    定义

    代理模式(Proxy),为其他对象提供一种代理以控制对这个对象的访问.


    使用场景

    1.远程代理,也就是为一个对象在不同的地址空间提供局部代表.这样可以隐藏一个对象存在于不同地址空间的事实.

    2.虚拟代理,是根据需要创建开销很大的对象.通过它来存放实例化需要很长时间的真实对象.

    3.安全代理,用来控制真实对象访问的权限.

    4.智能指引,是指当调用真实的对象时,代理处理另外一些事.


    实现代码

    //  SchoolGirl.h

    #import <Foundation/Foundation.h>

    @interface SchoolGirl : NSObject

    @property (nonatomic, copy) NSString *name;

    @end

    //  SchoolGirl.m

    #import "SchoolGirl.h"

    @implementation SchoolGirl

    @end

    //  Pursuit.h

    #import "GiveGift.h"

    @class SchoolGirl;

    @interface Pursuit : GiveGift

    @property (nonatomic, copy) SchoolGirl *girl;

    @end

    //  Pursuit.m

    #import "Pursuit.h"

    #import "SchoolGirl.h"

    @implementation Pursuit

    -(void)giveDolls:(SchoolGirl *)schoolGirl

    {

        NSLog(@"%@送你洋娃娃",schoolGirl.name);

    }

    -(void)giveFlowers:(SchoolGirl *)schoolGirl

    {

        NSLog(@"%@送你花",schoolGirl.name);

    }

    -(void)giveChocolate:(SchoolGirl *)schoolGirl

    {

        NSLog(@"%@送你巧克力",schoolGirl.name);

    }

    @end

    //  GiveGift.h

    #import <Foundation/Foundation.h>

    @class SchoolGirl;

    @interface GiveGift : NSObject

    -(void)giveDolls:(SchoolGirl *)schoolGirl;

    -(void)giveFlowers:(SchoolGirl *)schoolGirl;

    -(void)giveChocolate:(SchoolGirl *)schoolGirl;

    @end

    //  GiveGift.m

    #import "GiveGift.h"

    @implementation GiveGift

    @end

    //  Proxy.h

    #import "GiveGift.h"

    @class Pursuit;

    @interface Proxy : GiveGift

    @property (nonatomic, copy) Pursuit *pursuit;

    @end

    //  Proxy.m

    #import "Proxy.h"

    #import "Pursuit.h"

    #import "SchoolGirl.h"

    @implementation Proxy

    -(void)giveDolls:(SchoolGirl *)schoolGirl

    {

        Pursuit *pursuit = [[Pursuit alloc] init];

        [pursuit giveDolls:schoolGirl];

    }

    -(void)giveFlowers:(SchoolGirl *)schoolGirl

    {

        Pursuit *pursuit = [[Pursuit alloc] init];

        [pursuit giveFlowers:schoolGirl];

    }

    -(void)giveChocolate:(SchoolGirl *)schoolGirl

    {

        Pursuit *pursuit = [[Pursuit alloc] init];

        [pursuit giveChocolate:schoolGirl];

    }

    @end


    //  main.m

    //  代理模式(Proxy),为其他对象提供一种代理以控制对这个对象的访问.

    #import <Foundation/Foundation.h>

    #import "SchoolGirl.h"

    #import "Proxy.h"

    int main(int argc, const char * argv[]) {

        @autoreleasepool {

            SchoolGirl *jiaojiao = [[SchoolGirl alloc] init];

            jiaojiao.name = @"jiaojiao";

            

            Proxy *proxy = [[Proxy alloc] init];

            

            [proxy giveDolls:jiaojiao];

            [proxy giveFlowers:jiaojiao];

            [proxy giveChocolate:jiaojiao];

        }

        return 0;

    }

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  • 原文地址:https://www.cnblogs.com/chars/p/4935961.html
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