Introduction, Shao

Introduction, Shao

I. Proxy design:

 

When object A has some behavior and wants to inform object B (let object B become the proxy object of object)

 

Object B wants to listen to some behaviors of object A (making object B the proxy object of object)

 

When object A cannot process certain behaviors, let object B be the proxy object of object)

 

2. Passing values between objects

 

Steps for using Proxy: first, identify who calls someone else's proxy and who acts as someone else's proxy

 

Please represent the trilogy:

 

1> write a protocol and list the tasks that you are not convenient (or do not want to) (@ protocol StudentDelegate <NSObject>)

2> include an object that complies with the protocol. The object can be of any type (id <StudentDelegate> delegate ;)

3> when you want to notify the proxy to do something, it is to call the corresponding method of the proxy.

([Self. delegate studentDidReceiveDelivery: self];)

 

When someone else's agent trilogy:

 

1> comply with the Protocol (@ interface Teacher: NSObject <StudentDelegate>)

2> implement the corresponding methods in the Protocol

3> set the proxy object and assign a value to the proxy object. Establish the proxy relationship between the two.