综合参考链接的两篇文章搞的
Update
2017-1-17
增强了一点功能“如果信号传到控制器，则向navigationController push出这个控制器之前的控制器传递”
用途
用在多层级的视图逆向传值，用来代替block和通知和代理
条件
需要是responder的子类，并且是在一条响应链上面，例如controller->view->view->button。
使用方法
//发送，例如
- (void)buttonClickAction:(UIButton *)sender {
[sender sendYRUISignalForKey:YFTransferNameEvent userInfo:@{@"YFUserName" : [self userName]} callback:^(id receiver, id callbackData) {
NSLog(@"%@",[receiver class]);
}];
}
//实现方法，对信号进行拦截：
- (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;
}
}
为responder建的一个分类
.h文件
#import <UIKit/UIKit.h>
typedef void (^YRUISignalCallBack)(id receiver, id callbackData);
@interface YRUISignal : NSObject
@property (retain, nonatomic) NSString *name; //名字,唯一标识
@property (assign, nonatomic) NSInteger tag; //数字,辅助标识
@property (retain, nonatomic) id userInfo; //附带信息或参数
@property (weak, nonatomic) id sender; //发送者,应当是UIView或者UIViewController
@property (copy, nonatomic) YRUISignalCallBack callBack; //回调函数，可用于处理者调用
@end
@protocol YRUISignalDelegate <NSObject>
/*!
* @brief 处理某个信号，具体的是否处理该消息根据signal的name判别
*
* @param signal 待处理的信号消息
*
* @return 如果返回是YES，则继续传递消息，如果是NO，则中断响应链
*/
@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]]) {
//如果信号传到控制器，则向navigationController push出这个控制器之前的控制器传递
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 {
//信号在响应链中传递
nextSender = self.nextResponder;
}
if (nextSender) {
if ([nextSender respondsToSelector:@selector(handleYRUISignal:)]) {
if ([nextSender handleYRUISignal:signal]) {
[nextSender sendYRUISignal:signal];
} else {
return;
}
} else {
[nextSender sendYRUISignal:signal];
}
}
}
