使用@selector模仿代理功能降低代码耦合度

说明

该模式的好处就是两个产生联系的对象间并没有具体的耦合代码,增删改查均很直观

源码

Model

//
//  Model.h
//  SELMethod
//
//  Created by YouXianMing on 15/5/22.
//  Copyright (c) 2015年 YouXianMing. All rights reserved.
//#import <Foundation/Foundation.h>#define SafePerformSelector(Stuff) \
do { \
_Pragma("clang diagnostic push") \
_Pragma("clang diagnostic ignored \"-Warc-performSelector-leaks\"") \
Stuff; \
_Pragma("clang diagnostic pop") \
} while (0)@interface Model : NSObject/***  属性名字*/
@property (nonatomic, strong)  NSString  *name;/***  设置代理与方法*/
@property (nonatomic, weak) id    delegate;
@property (nonatomic)       SEL   method;- (void)doSomeThing;@end

//
//  Model.m
//  SELMethod
//
//  Created by YouXianMing on 15/5/22.
//  Copyright (c) 2015年 YouXianMing. All rights reserved.
//#import "Model.h"@implementation Model- (void)doSomeThing {// 执行代理以及方法if (_method && _delegate) {SafePerformSelector([_delegate performSelector:_method withObject:self]);}
}@end

ViewController

//
//  ViewController.m
//  SELMethod
//
//  Created by YouXianMing on 15/5/22.
//  Copyright (c) 2015年 YouXianMing. All rights reserved.
//#import "ViewController.h"
#import "Model.h"@interface ViewController ()@property (nonatomic, strong) Model *model;@end@implementation ViewController- (void)viewDidLoad {[super viewDidLoad];// 初始化对象self.model        = [Model new];self.model.name   = @"YouXianMing";// 设置代理与方法self.model.method   = @selector(modelValue:);self.model.delegate = self;// 执行操作[self.model doSomeThing];
}- (void)modelValue:(Model *)value {NSLog(@"%@", value.name);
}@end

细节