綜合參考鏈接的兩篇文章搞的

Update

2017-1-17

增強(qiáng)了一點(diǎn)功能“如果信號傳到控制器，則向navigationController push出這個(gè)控制器之前的控制器傳遞”

用途

用在多層級的視圖逆向傳值，用來代替block和通知和代理

條件

需要是responder的子類，并且是在一條響應(yīng)鏈上面，例如controller->view->view->button。

使用方法

//發(fā)送，例如
- (void)buttonClickAction:(UIButton *)sender {
    [sender sendYRUISignalForKey:YFTransferNameEvent userInfo:@{@"YFUserName" : [self userName]} callback:^(id receiver, id callbackData) {
        NSLog(@"%@",[receiver class]);
    }];
}

//實(shí)現(xiàn)方法，對信號進(jìn)行攔截：
- (BOOL)handleYRUISignal:(YRUISignal *)signal {
    if ([signal.name isEqualToString:YFTransferNameEvent]) {
        self.resultLabel.text = signal.userInfo[@"YFUserName"];
        if (signal.callBack) {
            signal.callBack(self,nil);
        }
        return NO;
    } else {
        return YES;
    }
}

為responder建的一個(gè)分類

.h文件

#import <UIKit/UIKit.h>
typedef void (^YRUISignalCallBack)(id receiver, id callbackData);

@interface YRUISignal : NSObject
@property (retain, nonatomic) NSString *name; //名字,唯一標(biāo)識
@property (assign, nonatomic) NSInteger tag;  //數(shù)字,輔助標(biāo)識
@property (retain, nonatomic) id userInfo;    //附帶信息或參數(shù)
@property (weak, nonatomic) id sender;   //發(fā)送者,應(yīng)當(dāng)是UIView或者UIViewController
@property (copy, nonatomic) YRUISignalCallBack callBack; //回調(diào)函數(shù)，可用于處理者調(diào)用
@end

@protocol YRUISignalDelegate <NSObject>

/*!
 * @brief 處理某個(gè)信號，具體的是否處理該消息根據(jù)signal的name判別
 *
 * @param  signal  待處理的信號消息
 *
 * @return 如果返回是YES，則繼續(xù)傳遞消息，如果是NO，則中斷響應(yīng)鏈
 */
@optional
- (BOOL)handleYRUISignal:(YRUISignal *)signal;

@end

@interface UIResponder (Router)<YRUISignalDelegate>

- (void)sendYRUISignalForKey:(NSString *)signalKey userInfo:(id)userInfo callback:(YRUISignalCallBack)callback;

@end

.m文件

#import "UIResponder+Router.h"

@implementation YRUISignal

@end

@implementation UIResponder (Router)

- (void)sendYRUISignalForKey:(NSString *)signalKey userInfo:(id)userInfo callback:(YRUISignalCallBack)callback {
    YRUISignal *signal = [[YRUISignal alloc] init];
    signal.name = signalKey;
    signal.userInfo = userInfo;
    signal.callBack = callback;
    [self sendYRUISignal:signal];
}
- (void)sendYRUISignal:(YRUISignal *)signal {
    id nextSender;
    if ([self isKindOfClass:[UIViewController class]]) {
        //如果信號傳到控制器，則向navigationController push出這個(gè)控制器之前的控制器傳遞
        UIViewController *vc = (UIViewController *)self;
        if (vc.navigationController.childViewControllers.count > 0) {
            NSInteger index = [vc.navigationController.childViewControllers indexOfObject:vc];
            if (index > 0) {
                nextSender = vc.parentViewController.childViewControllers[index - 1];
            }
        }
    } else {
        //信號在響應(yīng)鏈中傳遞
        nextSender = self.nextResponder;
    }
    if (nextSender) {
        if ([nextSender respondsToSelector:@selector(handleYRUISignal:)]) {
            if ([nextSender handleYRUISignal:signal]) {
                [nextSender sendYRUISignal:signal];
            } else {
                return;
            }
        } else {
            [nextSender sendYRUISignal:signal];
        }
    }
}

參考鏈接

iOS中UI事件處理YRUISignal
路由響應(yīng)鏈方法進(jìn)行傳值