[Objective-c] 015_delegate (principal agent)

Delegate is ubiquitous in iOS development, delegate is a powerful software architecture design concept, its function is that one object in the program represents another object, or one object works with another object (such as Xiao Ming likes a girl like a flower, but suffers from no contact with the flower, So applauded brother small east to take flowers contact way, small East classmates a day later return results to Xiaoming, .... ）。 Xiao Ming can successfully chase the flowers, small east in which did something, the following step by step decomposition.

1. Create a delegate (via protocol)

#import <Foundation/Foundation.h>
@protocol phonenumberdelegate <NSObject> @required-(NSString *) Goddessphonenumber; @end

2. Declare a delegate (xiaoming)

@interface Student:person <StudentProtocol> @property (nonatomic, assign) id<phonenumberdelegate> delegate;-(ID) initwithname: (NSString *) name sex: (NSString *) Sex Age: (int.) age; @end

3. Implement the Principal-agent method (small east)

#import "Person.h" @implementation person@synthesize name = _name,sex = _sex; @synthesize age = _age;-(NSString *) GODDESSPH Onenumber {    NSLog (@ "is rushing to like a flower home, to the flower mother to inquire about the number of flowers ... 5 minutes to get it. If the flower number 13888888888 ");    return @ "13888888888";} @end

4. Set up the delegate agent (Xiaoming---small east), and invoke the proxy method

#import "AppDelegate.h" #import "Person.h" #import "Student.h" @interface appdelegate () @end @implementation appdelegate-(BOOL) Application: (UIApplication *) application didfinishlaunchingwithoptions: (NSDictionary *) launchoptions {        Student *xiaoming = [[Student alloc] init];    Person  *xiaodong = [[Person alloc] init];    Set the principal agent    xiaoming.delegate = Xiaodong;    Execute the principal-agent method    NSString *phonenumber = [Xiaodong goddessphonenumber];    Keep the goddess number    xiaoming.goddessphonenumber = PhoneNumber;        return YES;} @end

Delegate is so easy to use, Xiao Ming's wish to get the number like flowers.

2015-08-10 21:20:56.516 attendance[56285:1842177] is rushing to like a flower home, to the flower mother to inquire like the number of flowers ... 5 minutes to get it . as the number of flowers 13888888888

2015-08-10 21:20:56.517 attendance[56285:1842177] Xiaoming finally got the flower number:13888888888

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Reprinted from "Baby bus Superdo Team" original link: http://www.cnblogs.com/superdo/p/4719244.html

[Objective-c] 015_delegate (principal agent)