Delegate Agent Supplement

I. Protocol: Declaration of a pair of methods

Ii. Specific steps

1, define the protocol

2, provide an interface to the outside world to set the delegate property (in the. h file of the class)

when defining the delegate property, you need to use the assign property to prevent circular references.

3, assigning delegate to the outside world

4, outside acceptance of agreement

You can add an automatically generated class after the external. m file.

4, let delegate execute the corresponding method in the protocol (in the. m file of the Class) at the corresponding point in time.

5, outside ways to implement Protocols

Delegate Agent Supplement