Detailed Explanation of Implementation Example of IOS Agent Mode

Implementation of IOS Proxy Mode

In client development, notifications, proxies and block are often used to realize the association between various pages. Notification, in a straight "blind" way to achieve transmission. Agent, block
You can clearly know the relationship between various interfaces. Taking agency as an example, the general practice is as follows:

DesViewController *des = [[DesViewController alloc] init];des.delegate = self;[self.navigationController pushViewController:des animated:YES];

In this case, there is a definite relationship between the two interfaces, for example, jumping from A interface to B interface or a view is a part between A controllers. However, if there is no contact, how to deal with it? For example, A interface needs to display different data according to user login status, or display different interface conditions:

Actual combat:

Idea: Create a management class processing, set the corresponding proxy method, and then add or delete the corresponding proxy method when needed.

Core code:

. h file

//// RSLoginService.h// iOSDelegate//// Created by admin on 2016/11/6.// Copyright © 2016 Year  Reading. All rights reserved.
//#import <Foundation/Foundation.h>@protocol UserLoginStatusDelegate <NSObject>
- (void)userDidLoginIn;
- (void)userWillLoginOut;
@end@interface RSLoginService : NSObject+ (instancetype)sharedInstance;
@property (nonatomic, strong) NSMutableSet *delegates;
- (void)onWillLoginOut;
- (void)onDidLoginIn;
- (void)addDelegate:(id<UserLoginStatusDelegate>) delegate;
- (void)removeDelegate:(id<UserLoginStatusDelegate>) delegate;@end

. m file

//// RSLoginService.m// iOSDelegate//// Created by admin on 2016/11/6.

// Copyright © 2016 Year  Reading. All rights reserved.

//#import "RSLoginService.h"@implementation 

RSLoginService+ (instancetype)sharedInstance{  static id instance;  static dispatch_once_t onceToken;  dispatch_once(&onceToken, ^{ 
   instance = [[RSLoginService alloc] init];  });  return instance;}- (void)onWillLoginOut{  

// do something you need to do before Login out 
 [self.delegates makeObjectsPerformSelector:@selector(userWillLoginOut)];}- (void)onDidLoginIn{  

 // do something you need to do after Login In  
 [self.delegates makeObjectsPerformSelector:@selector(userDidLoginIn)];}- 
(void)addDelegate:(id<UserLoginStatusDelegate>) delegate{  if (![self.delegates containsObject:delegate]) 
{    [self.delegates addObject:delegate];  }
}- (void)removeDelegate:(id<UserLoginStatusDelegate>) 
delegate{  if (![self.delegates containsObject:delegate]) { 
    [self.delegates removeObject:delegate];  }}- (NSMutableSet *)delegates{  if (!_delegates) {    _delegates = [NSMutableSet set];  }  return _delegates;}@end

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