Detailed Explanation of Implementation Example of IOS Agent Mode

  • 2021-07-18 09:09:16
  • OfStack

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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