IOS Design Pattern Learning (22) proxy

1 Preface

A common use of proxy is as a lightweight proxy object, which allows the client to first access some cheap information or functions. When a user is willing to pay for the real and high-price membership status, the proxy opens the door to allow users to access more functions only available to paying members.

A specific design pattern is called AGENCY pattern.

2. Details

2.1 Brief Introduction

Provides a proxy for other objects to control access to this object.

2.2 proxy category

(1) remote proxy: provides a local representation of objects in different address spaces or networks.

(2) virtual proxy: creates heavy objects as needed.

(3) protection proxy: controls access to the original object based on various access permissions.

(4) smart-reference proxy: manages the memory by counting the real object references. It is also used to lock a real object so that other objects cannot be modified.

3 conclusion

The above is all content and I hope it will help you.