视频教程-极客学院

ps:感觉打的一手好广告啊，因为自己不太爱看视频，但这类又必须看才能明白。粘贴源代码是为了以后查阅方便，也注释了自己的理解。

代理

Customer

#import <Foundation/Foundation.h>
@class Customer;

@protocol CustomerDelegate <NSObject>

@required
- (void)custmer:(Customer *)custmer buyItemCount:(NSInteger)count;

@end

@interface Customer : NSObject

// 经销商
@property (nonatomic, weak) id <CustomerDelegate> delegate;

// 顾客买卖行为
- (void)buyItemCount:(NSInteger)count;

@end

#import "Customer.h"

@implementation Customer

- (void)buyItemCount:(NSInteger)count {

    if (self.delegate && [self.delegate respondsToSelector:@selector(custmer:buyItemCount:)]) {
        
        [self.delegate custmer:self buyItemCount:count];
    }
}

@end

使用

#import "ViewController.h"
#import "Customer.h"

// 经销商
@interface ViewController () <CustomerDelegate>

@end

@implementation ViewController

- (void)viewDidLoad {
    
    [super viewDidLoad];
    
    Customer *customer  = [[Customer alloc] init];
    customer.delegate   = self;
    
    [customer buyItemCount:5];
}

- (void)custmer:(Customer *)custmer buyItemCount:(NSInteger)count {

    NSLog(@"%ld", (long)count);
}

@end

协议

感觉协议和代理是有所不同，但不同...感觉说不出来

TCPProtocol

#import <Foundation/Foundation.h>

@protocol TCPProtocol <NSObject>

@required

// 获取源端口号
- (NSInteger)sourcePort;

// 获取目的地端口号
- (NSInteger)destinationPort;

@end

Model

#import <Foundation/Foundation.h>
#import "TCPProtocol.h"

@interface Model : NSObject <TCPProtocol>

@end

#import "Model.h"

@implementation Model

// 获取源端口号
- (NSInteger)sourcePort {

    return 10;
}

// 获取目的地端口号
- (NSInteger)destinationPort {

    return 20;
}

@end

使用

#import "ViewController.h"
#import "Customer.h"
#import "TCPProtocol.h"

// 经销商
@interface ViewController () 

@property (nonatomic) NSInteger  sourcePort;
@property (nonatomic) NSInteger  destinationPort;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
}


- (void)accessTCPData:(id <TCPProtocol>)data {

    self.sourcePort      = [data sourcePort];
    self.destinationPort = [data destinationPort];
}