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demo地址https://download.csdn.net/download/denggun12345/88104411?spm1001.2014.3001.5503
//基类BusinessObject
#import Foundation/Foundation.h
#import UIKit/UIKit.h
NS_ASSUME_NONNULL_BEGIN
class BusinessObject;
typedef void(^CompletionBlock)(BOOL handled);
typedef void(^ResultBlock)(BusinessObject *handler, BOOL handled);
interface BusinessObject : NSObject
property (nonatomic,strong) UILabel *LB;
//下一个响应者
property (nonatomic,strong) BusinessObject *nextBusiness;
//响应者的处理方法
-(void)handle:(ResultBlock)result;
//各个业务在该方法当中做时机业务处理
-(void)handleBusiness:(CompletionBlock)completion;
end
NS_ASSUME_NONNULL_END
#import BusinessObject.h implementation BusinessObject
//责任链入口方法
-(void)handle:(ResultBlock)result{ CompletionBlock completion ^(BOOL handled){ //当前业务处理掉了上抛结果 if(handled){ result(self,handled); }else{ //沿着责任链指派给下一个业务处理 if(self.nextBusiness){ [self.nextBusiness handle:result]; }else{ //没有业务处理上抛 result(nil,NO); } } }; //当前业务进行处理 [self handleBusiness:completion];
}
-(void)handleBusiness:(CompletionBlock)completion{ //业务逻辑处理 //如不网络请求、本地照片查询等
}
end
模拟业务类即继承基类的类用来模拟指纹、手势、ocr的业务类
#import BusinessObjectA.h
implementation BusinessObjectA
-(void)handleBusiness:(CompletionBlock)completion{ NSLog(BusinessObjectA); if ([self.LB.text isEqualToString:0]) { completion(YES); }else{ completion(NO); }
}
end #import BusinessObjectB.h
implementation BusinessObjectB
-(void)handleBusiness:(CompletionBlock)completion{ NSLog(BusinessObjectB); if ([self.LB.text isEqualToString:0]) { completion(YES); }else{ completion(NO); }
}
end
#import BusinessObjectC.h
implementation BusinessObjectC
-(void)handleBusiness:(CompletionBlock)completion{ NSLog(BusinessObjectC); if ([self.LB.text isEqualToString:0]) { completion(YES); }else{ completion(NO); }
}
end
//模拟处理逻辑优先级
#import ViewController.h
#import BusinessObjectA.h
#import BusinessObjectB.h
#import BusinessObjectC.h interface ViewController ()
//背景变红色
property (nonatomic,assign) BOOL isOuShu;
property (weak, nonatomic) IBOutlet UILabel *LBOne;
property (weak, nonatomic) IBOutlet UILabel *LBTwo;
property (weak, nonatomic) IBOutlet UILabel *LBThree;
property (nonatomic,strong) NSArray *testArray;
property (weak, nonatomic) IBOutlet UIButton *testBtn; end implementation ViewController
-(NSArray *)testArray{ if(!_testArray){ _testArray [1,2,3]; } return _testArray;
}
- (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view.} - (IBAction)ClickAction:(id)sender { int x arc4random() % 3;//0 1 2 模拟责任链中密码、手势、指纹的优先级 self.LBOne.text [NSString stringWithFormat:%d,x]; self.LBTwo.text [NSString stringWithFormat:%d,x-1]; self.LBThree.text [NSString stringWithFormat:%d,x-2]; //开始责任链 //a指纹 BusinessObjectA *objA [BusinessObjectA new]; objA.LB self.LBOne; [objA handle:^(BusinessObject * _Nonnull handler, BOOL handled) { if(handled){ NSLog(a_yes_handler_test:%,handler.LB.text); [self.testBtn setTitle:LBOne forState:UIControlStateNormal]; }else{ NSLog(a_no_handler_test:%,handler.LB.text); } }]; //b手势 BusinessObjectB *objB [BusinessObjectB new]; objB.LB self.LBTwo; objA.nextBusiness objB; [objB handle:^(BusinessObject * _Nonnull handler, BOOL handled) { if(handled){ NSLog(b_yes_handler_test:%,handler.LB.text); [self.testBtn setTitle:LBTwo forState:UIControlStateNormal]; }else{ NSLog(b_no_handler_test:%,handler.LB.text); } }]; //cOCR BusinessObjectC *objC [BusinessObjectC new]; objC.LB self.LBThree; objB.nextBusiness objC; [objC handle:^(BusinessObject * _Nonnull handler, BOOL handled) { if(handled){ [self.testBtn setTitle:LBThree forState:UIControlStateNormal]; NSLog(c_yes_handler_test:%,handler.LB.text); }else{ NSLog(c_no_handler_test:%,handler.LB.text); } }];
}
end
