How to Create a proxy in Objective-C and create an objective-c

How to Create a proxy in Objective-C and create an objective-c

First, we need to create a class. In order to facilitate understanding, we will simulate finding an intermediary to rent a house in real life. Therefore, we need to create a Person class first.

1. Define the proxy protocol in Person. h and complete the proxy method declaration: the code is as follows:

1 // Person. h文2 2 3 # import <Foundation/Foundation. h> 4 5 @ class Person; 6 7 // 1 Define the proxy protocol 8 @ protocol PersonDelegate <NSObject> 9 10 // optional method 11 @ optional12-(void) personFindHouse :( Person *) person; 13 // required method 14 @ required15 16 @ end17 18 @ interface Person: NSObject19 20 @ end

Note: The optional methods in the proxy Protocol can be implemented or not, but the necessary methods must be implemented.

2. Define proxy properties: the code is as follows:

1 // Person. h文2 2 3 # import <Foundation/Foundation. h> 4 @ class Person; 5 // 1 Define the proxy protocol 6 @ protocol PersonDelegate <NSObject> 7 // optional method 8 @ optional 9-(void) personFindHouse :( Person *) person; 10 // required method 11 @ required12 13 @ end14 15 @ interface Person: NSObject16 @ property (nonatomic, copy) NSString * name; 17 // 2 define proxy attributes 18 @ property (nonatomic, weak) id <PersonDelegate> delegate; 19-(void) zuFang; 20 @ end

3. Call the proxy method (notification) to send a message to the Proxy: the code is as follows:

1 // Person. m file 2 # import "Person. h "3 4 @ implementation Person 5-(void) zuFang 6 {7 NSLog (@" % @ -- rent a house ", self. name); 8 9 // 3 call the proxy method (notification) to send a message to the proxy 10 if ([self. delegate respondsToSelector: @ selector (personFindHouse :)]) 11 {12 [self. delegate personFindHouse: self]; 13 14} 15} 16 @ end

The first line of the code above is to determine whether the object has implemented the personFindHouse: This method

Now we need to define a ZhongJie class to use this proxy.

1. Make this class comply with the proxy Protocol: the code is as follows:

1 // ZhongJie. h file 2 # import <Foundation/Foundation. h> 3 # import "Person. h" 4 5 @ interface ZhongJie: NSObject <PersonDelegate> 6 7 @ end

2. Implement proxy method: the code is as follows:

1 // ZhongJie. m file 2 # import "ZhongJie. h "3 4 @ implementation ZhongJie 5 6-(void) personFindHouse :( Person *) person 7 {8 NSLog (@" found house "); 9} 10 11 @ end

3. Set proxy properties: the code is as follows:

1 // ViewController. m file 2 # import "ViewController. h "3 # import" Person. h "4 # import" ZhongJie. h "5 @ interface ViewController () 6 7 @ end 8 9 @ implementation ViewController10 11-(void) viewDidLoad {12 [super viewDidLoad]; 13 // Do any additional setup after loading the view, typically from a nib.14 ZhongJie * zj = [[ZhongJie alloc] init]; 15 16 Person * p = [[Person alloc] init]; 17 18 p. name = @ "someOne"; 19 // 3 set proxy properties 20 p. delegate = zj; 21 22 [p zuFang]; 23 24} 25 26 27 @ end

 

In this way, a proxy is created and an object uses this proxy.