Introduction-Agent Mode in OC

One , the agent design mode of the occasion:

When object A has some behavior, you want to tell object B (to make object b a proxy object)

Object B wants to listen to some behavior of object A (Make object b a proxy object)

When object A cannot handle certain behaviors, it wants object B to handle it (making object B a proxy object)

Second , the value of the transfer between the objects

To use a proxy: First of all, be clear about who is the agent, who will act as someone else

Please represent the trilogy:

1> write a protocol that lists things that are inconvenient (or do not want to) (@protocol studentdelegate <NSObject>)

2> contains an object that complies with the agreement, and the object can be any type (id<studentdelegate> delegate;)

3> when you have something to tell the agent to do, is to call the agent corresponding method

([Self.delegate studentdidreceivedelivery:self];)

When someone else's acting trilogy:

1> Compliance Agreement (@interface teacher:nsobject<studentdelegate>)

2> implementation of the protocol inside the corresponding method

3> sets the proxy object and assigns a value to the proxy object. Establishing the agency relationship between the two

Introduction-Agent Mode in OC