Objective-c Agreement Lan Yi Education

1, the protocol uses the situation: A class has an instance method, this instance method to the object passed over, restricts it must implement a specific method, and the passed object type is not limited.

2. Format

Protocol name: @protocol protocol Name Protocol name general: class name +delegate.

Protocol content: A specific method

Specific examples:

①

The instance method in the AA class has a protocol limit.

The BB class is a generic class.

Ii

In Aa.h :

Protocol wording

@protocol aadelegate < NSObject >

Agreement content

-(void) play;

@end

@interface Aa: NSObject

The object of the infection complies with the agreement

-(void) Playwithobject: (ID<AaDelegate>) anyobject;

@end

An example method of AA.M with protocol is written in the paper.

-(void) Playwithobject: ( ID <aa Delegate >) anyobject{

[anyobject play];

}

③

When introducing the AA Bb class in the Viewcontroller.

Create objects individually. AA class object, invoking an instance method to pass the BB class object into the Times warning: The BB class object must be compliant with the protocol of the instance method in the AA class.

Need to Bb.hin the Bb class:

The class in which the Protocol is introduced

#import "Aa.h"

Let the BB class comply with the agreement:

@interface Bb: NSObject <aaDelegate>

Implement the Protocol content in Bb.h.

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Objective-c Agreement Lan Yi Education