ReactiveCocoa学习总结
SherryHawki
9年前
来自： http://www.cnblogs.com/wujy/p/5177819.html
最近一直断断续续学习关于ReactiveCocoa的知识内容，对于它的一些基础内容将通过本文进行一个总结，主要是一些入门知识
一： RACSignal一些运用
@interface RACSignalTestViewController () @property(nonatomic,strong)RACSignal *mySignal,*secondSingl; @end
-(RACSignal *)mySignal { if (!_mySignal) { _mySignal=[RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) { [subscriber sendNext:@10]; [subscriber sendCompleted]; return nil; }]; } return _mySignal; } -(RACSignal *)secondSingl { if (!_secondSingl) { _secondSingl=[RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) { [subscriber sendNext:@20]; [subscriber sendCompleted]; return nil; }]; } return _secondSingl; } 先创建两个RACSignal的内容；将用于接下来的一些操作
//map运用 返回的值作为next的参数 [[self.mySignal map:^id(NSNumber *value) { return [value integerValue]>5?@"踏浪帅":@"有点小"; }] subscribeNext:^(NSString *str) { NSLog(@"map处理完成的值为：%@",str); }]; //filter:过滤信号，使用它可以获取满足条件的信号. [[self.mySignal filter:^BOOL(NSNumber *item) { return [item integerValue]>5; }] subscribeNext:^(NSNumber *x) { NSLog(@"filter当前的值%ld",[x integerValue]); }]; //ignore:忽略完某些值的信号.当答合被ignore的值时就不会执行next [[self.mySignal ignore:@10] subscribeNext:^(id x) { NSLog(@"ignore当前的值:%@",x); }]; //distinctUntilChanged:当上一次的值和当前的值有明显的变化就会发出信号，否则会被忽略掉。 [[self.mySignal distinctUntilChanged] subscribeNext:^(id x) { NSLog(@"distinctUntilChanged当前的值:%@",x); }]; //take:从开始一共取N次的信号 //takeLast:取最后N次的信号,前提条件，订阅者必须调用完成，因为只有完成，就知道总共有多少信号. //takeUntil:(RACSignal *):获取信号直到某个信号执行完成 //skip:(NSUInteger):跳过几个信号,不接受。 运行结果：
MobileProject[885:18784] map处理完成的值为：踏浪帅 2016-02-02 16:03:07.643 MobileProject[885:18784] filter当前的值10 2016-02-02 16:03:07.644 MobileProject[885:18784] distinctUntilChanged当前的值:10
1.2：一些组合的操作
//concat:按一定顺序拼接信号，当多个信号发出的时候，有顺序的接收信号 RACSignal *concatSignal=[self.mySignal concat:self.secondSingl]; [concatSignal subscribeNext:^(id x) { NSLog(@"concat拼接的值：%@",x); }]; //then:用于连接两个信号，当第一个信号完成，才会连接then返回的信号 [[self.mySignal then:^RACSignal *{ @strongify(self); return self.secondSingl; }] subscribeNext:^(id x) { //// 只能接收到第二个信号的值，也就是then返回信号的值 NSLog(@"then当前的值为：%@",x); }]; //merge:把多个信号合并为一个信号，任何一个信号有新值的时候就会调用 RACSignal *mergeSignal=[self.mySignal merge:self.secondSingl]; [mergeSignal subscribeNext:^(id x) { NSLog(@"merge当前的值为:%@",x); }]; //combineLatest:将多个信号合并起来，并且拿到各个信号的最新的值,必须每个合并的signal至少都有过一次sendNext，两个信号的内容合并成一个元组RACTuple,才会触发合并的信号。 RACSignal *combineLatestSignal=[self.mySignal combineLatestWith:self.secondSingl]; [combineLatestSignal subscribeNext:^(id x) { NSLog(@"combineLastest当前的值为：%@",x); }]; //zipWith:把两个信号压缩成一个信号，只有当两个信号同时发出信号内容时，并且把两个信号的内容合并成一个元组RACTuple，才会触发压缩流的next事件。 RACSignal *zipWithSignal=[self.mySignal zipWith:self.secondSingl]; [zipWithSignal subscribeNext:^(RACTuple *tuple) { NSLog(@"zipWith当前的值为：%@",tuple); NSLog(@"zipWith中的RACTuple共有几个值：%ld",tuple.count); NSLog(@"zipWith中的RACTuple第一个值为：%@",tuple.first); NSLog(@"zipWith中的RACTuple最后一个值为：%@",tuple.last); }]; //reduce聚合:用于信号发出的内容是元组，把信号发出元组的值聚合成一个值 特别是combineLatestWith,zipWith这种返回元组的RACTuple,reduceblcok中的参数，有多少信号组合，reduceblcok就有多少参数，每个参数就是之前信号发出的内容 RACSignal *reduceSignal=[RACSignal combineLatest:@[self.mySignal,self.secondSingl] reduce:^id(NSNumber *num1 ,NSNumber *num2){ NSLog(@"combineLastest结合reduct的第一个值为：%ld 第二个值为：%ld",[num1 integerValue],[num2 integerValue]); return ([num1 integerValue]>10&&[num2 integerValue]>15)?@"两个都符合要求":@"都没有答合要求"; }]; [reduceSignal subscribeNext:^(id x) { NSLog(@"reduce当前的值为：%@",x); }]; 运行结果：
MobileProject[885:18784] concat拼接的值：10 2016-02-02 16:03:07.645 MobileProject[885:18784] concat拼接的值：20 2016-02-02 16:03:07.646 MobileProject[885:18784] then当前的值为：20 2016-02-02 16:03:07.646 MobileProject[885:18784] merge当前的值为:10 2016-02-02 16:03:07.646 MobileProject[885:18784] merge当前的值为:20 2016-02-02 16:03:07.647 MobileProject[885:18784] combineLastest当前的值为：<RACTuple: 0x7ff5ca606860> ( 10, 20 ) 2016-02-02 16:03:07.648 MobileProject[885:18784] zipWith当前的值为：<RACTuple: 0x7ff5ca60ab80> ( 10, 20 ) 2016-02-02 16:03:07.648 MobileProject[885:18784] zipWith中的RACTuple共有几个值：2 2016-02-02 16:03:07.648 MobileProject[885:18784] zipWith中的RACTuple第一个值为：10 2016-02-02 16:03:07.648 MobileProject[885:18784] zipWith中的RACTuple最后一个值为：20 2016-02-02 16:03:07.649 MobileProject[885:18784] combineLastest结合reduct的第一个值为：10 第二个值为：20 2016-02-02 16:03:07.720 MobileProject[885:18784] reduce当前的值为：都没有答合要求
1.3：其它一些操作：
//doNext: 执行Next之前，会先执行这个Block,可以做一些初使化的功能,doCompleted: 执行sendCompleted之前，会先执行这个Block [[[self.mySignal doNext:^(id x) { NSLog(@"doNext当前的值：%@",x); }] doCompleted:^{ NSLog(@"doComplete 执行到了"); }] subscribeNext:^(id x) { NSLog(@"测试doNext,doComplete的值：%@",x); }]; //switchToLatest:用于signalOfSignals（信号的信号），有时候信号也会发出信号，会在signalOfSignals中，获取signalOfSignals发送的最新信号。 RACSubject *signalOfSignals = [RACSubject subject]; RACSubject *signal = [RACSubject subject]; // 获取信号中信号最近发出信号，订阅最近发出的信号。 // 注意switchToLatest：只能用于信号中的信号 [signalOfSignals.switchToLatest subscribeNext:^(id x) { NSLog(@"switchToLatest%@",x); }]; [signalOfSignals sendNext:signal]; [signal sendNext:@1]; //deliverOn: 内容传递切换到制定线程中，副作用在原来线程中,把在创建信号时block中的代码称之为副作用。 //subscribeOn: 内容传递和副作用都会切换到制定线程中。' //timeout：超时，可以让一个信号在一定的时间后，自动报错。 [[self.mySignal timeout:1 onScheduler:[RACScheduler currentScheduler]] subscribeNext:^(id x) { NSLog(@"timeout当前的值：%@",x); } error:^(NSError *error) { NSLog(@"timeout 超时了"); }]; //delay 延迟发送next。 [[self.mySignal delay:2] subscribeNext:^(id x) { NSLog(@"delay执行%@",x); }]; //retry重试 ：只要失败，就会重新执行创建信号中的block,直到成功. __block int i = 0; [[[RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) { if (i == 10) { [subscriber sendNext:@100]; }else{ NSLog(@"接收到错误"); [subscriber sendError:nil]; } i++; return nil; }] retry] subscribeNext:^(id x) { NSLog(@"retry当前的值：%@",x); } error:^(NSError *error) { }]; //普通执行多次订阅 RACSignal *oneSignal = [[RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) { [subscriber sendNext:@1]; [subscriber sendNext:@2]; return nil; }] replay]; [oneSignal subscribeNext:^(id x) { NSLog(@"第一个没有replay执行的内容：%@",x); }]; [oneSignal subscribeNext:^(id x) { NSLog(@"第二个没有replay执行的内容：%@",x); }]; //replay重放：当一个信号被多次订阅,反复播放内容 RACSignal *replaySignal = [[RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) { [subscriber sendNext:@1]; [subscriber sendNext:@2]; return nil; }] replay]; [replaySignal subscribeNext:^(id x) { NSLog(@"replay第一个订阅者%@",x); }]; [replaySignal subscribeNext:^(id x) { NSLog(@"replay第二个订阅者%@",x); }]; //interval 定时：每隔一段时间发出信号 [[RACSignal interval:1 onScheduler:[RACScheduler currentScheduler]] subscribeNext:^(id x) { NSLog(@"interval一直在执行：%@",x); }]; //throttle节流:当某个信号发送比较频繁时，可以使用节流，在某一段时间不发送信号内容，过了一段时间获取信号的最新内容发出。 运行结果：
2016-02-02 16:03:07.720 MobileProject[885:18784] doNext当前的值：10 2016-02-02 16:03:07.720 MobileProject[885:18784] 测试doNext,doComplete的值：10 2016-02-02 16:03:07.721 MobileProject[885:18784] doComplete 执行到了 2016-02-02 16:03:07.721 MobileProject[885:18784] switchToLatest1 2016-02-02 16:03:07.722 MobileProject[885:18784] timeout当前的值：10 2016-02-02 16:03:07.722 MobileProject[885:18784] 接收到错误 2016-02-02 16:03:07.723 MobileProject[885:18784] 第一个没有replay执行的内容：1 2016-02-02 16:03:07.723 MobileProject[885:18784] 第一个没有replay执行的内容：2 2016-02-02 16:03:07.723 MobileProject[885:18784] 第二个没有replay执行的内容：1 2016-02-02 16:03:07.723 MobileProject[885:18784] 第二个没有replay执行的内容：2 2016-02-02 16:03:07.724 MobileProject[885:18784] replay第一个订阅者1 2016-02-02 16:03:07.724 MobileProject[885:18784] replay第一个订阅者2 2016-02-02 16:03:07.724 MobileProject[885:18784] replay第二个订阅者1 2016-02-02 16:03:07.724 MobileProject[885:18784] replay第二个订阅者2 2016-02-02 16:03:07.838 MobileProject[885:18784] 接收到错误 2016-02-02 16:03:07.838 MobileProject[885:18784] 接收到错误 2016-02-02 16:03:07.838 MobileProject[885:18784] 接收到错误 2016-02-02 16:03:07.838 MobileProject[885:18784] 接收到错误 2016-02-02 16:03:07.839 MobileProject[885:18784] 接收到错误 2016-02-02 16:03:07.865 MobileProject[885:18784] 接收到错误 2016-02-02 16:03:07.865 MobileProject[885:18784] 接收到错误 2016-02-02 16:03:07.865 MobileProject[885:18784] 接收到错误 2016-02-02 16:03:07.866 MobileProject[885:18784] 接收到错误 2016-02-02 16:03:07.866 MobileProject[885:18784] retry当前的值：100 2016-02-02 16:03:08.726 MobileProject[885:18784] interval一直在执行：2016-02-02 08:03:08 +0000 2016-02-02 16:03:09.724 MobileProject[885:18784] delay执行10 2016-02-02 16:03:09.725 MobileProject[885:18784] interval一直在执行：2016-02-02 08:03:09 +0000 2016-02-02 16:03:10.726 MobileProject[885:18784] interval一直在执行：2016-02-02 08:03:10 +0000 2016-02-02 16:03:11.724 MobileProject[885:18784] interval一直在执行：2016-02-02 08:03:11 +0000 2016-02-02 16:03:12.727 MobileProject[885:18784] interval一直在执行：2016-02-02 08:03:12 +0000 2016-02-02 16:03:13.725 MobileProject[885:18784] interval一直在执行：2016-02-02 08:03:13 +0000 2016-02-02 16:03:14.730 MobileProject[885:18784] interval一直在执行：2016-02-02 08:03:14 +0000 2016-02-02 16:03:15.726 MobileProject[885:18784] interval一直在执行：2016-02-02 08:03:15 +0000
二：关于 RACCommand的一些知识
@interface TestRacViewController () @property(nonatomic,strong)UITextField *userNameText; @property(strong,nonatomic)NSString *username; @property(nonatomic,strong)UIButton *loginButton,*racCommendButton,*errCommendButton,*mainThreadButton,*netWorkButton,*testButton; @property(nonatomic,strong)RACCommand *otherMyRaccomand,*mainThreadCommend,*netWorkCommend,*testPropertyCommend; @end
//布局 -(void)loadPage { if (!self.userNameText) { self.userNameText=[[UITextField alloc]init]; self.userNameText.backgroundColor=[UIColor whiteColor]; self.userNameText.placeholder=@"输入用户名"; [self.view addSubview:self.userNameText]; [self.userNameText mas_makeConstraints:^(MASConstraintMaker *make) { make.left.mas_equalTo(self.view.mas_left).with.offset(15); make.top.mas_equalTo(self.view.mas_top).with.offset(70); make.right.mas_equalTo(self.view.mas_right).with.offset(-15); make.height.mas_equalTo(@40); }]; } if(!self.loginButton) { self.loginButton=[[UIButton alloc]init]; [self.loginButton setTitle:@"响应" forState:UIControlStateNormal]; self.loginButton.backgroundColor=[UIColor blueColor]; [self.view addSubview:self.loginButton]; [self.loginButton mas_makeConstraints:^(MASConstraintMaker *make) { make.left.mas_equalTo(self.view.mas_left).with.offset(15); make.top.mas_equalTo(self.userNameText.mas_bottom).with.offset(20); make.right.mas_equalTo(self.view.mas_right).with.offset(-15); make.height.mas_equalTo(@40); }]; } if(!self.racCommendButton) { self.racCommendButton=[[UIButton alloc]init]; [self.racCommendButton setTitle:@"RacCommend测试" forState:UIControlStateNormal]; self.racCommendButton.backgroundColor=[UIColor blueColor]; [self.view addSubview:self.racCommendButton]; [self.racCommendButton mas_makeConstraints:^(MASConstraintMaker *make) { make.left.mas_equalTo(self.view.mas_left).with.offset(15); make.top.mas_equalTo(self.loginButton.mas_bottom).with.offset(20); make.right.mas_equalTo(self.view.mas_right).with.offset(-15); make.height.mas_equalTo(@40); }]; } if(!self.errCommendButton) { self.errCommendButton=[[UIButton alloc]init]; [self.errCommendButton setTitle:@"ERROR测试" forState:UIControlStateNormal]; self.errCommendButton.backgroundColor=[UIColor blueColor]; [self.view addSubview:self.errCommendButton]; [self.errCommendButton mas_makeConstraints:^(MASConstraintMaker *make) { make.left.mas_equalTo(self.view.mas_left).with.offset(15); make.top.mas_equalTo(self.racCommendButton.mas_bottom).with.offset(20); make.right.mas_equalTo(self.view.mas_right).with.offset(-15); make.height.mas_equalTo(@40); }]; } if(!self.mainThreadButton) { self.mainThreadButton=[[UIButton alloc]init]; [self.mainThreadButton setTitle:@"主线程上运行" forState:UIControlStateNormal]; self.mainThreadButton.backgroundColor=[UIColor blueColor]; [self.view addSubview:self.mainThreadButton]; [self.mainThreadButton mas_makeConstraints:^(MASConstraintMaker *make) { make.left.mas_equalTo(self.view.mas_left).with.offset(15); make.top.mas_equalTo(self.errCommendButton.mas_bottom).with.offset(20); make.right.mas_equalTo(self.view.mas_right).with.offset(-15); make.height.mas_equalTo(@40); }]; } if(!self.netWorkButton) { self.netWorkButton=[[UIButton alloc]init]; [self.netWorkButton setTitle:@"属性测试" forState:UIControlStateNormal]; self.netWorkButton.backgroundColor=[UIColor blueColor]; [self.view addSubview:self.netWorkButton]; [self.netWorkButton mas_makeConstraints:^(MASConstraintMaker *make) { make.left.mas_equalTo(self.view.mas_left).with.offset(15); make.top.mas_equalTo(self.mainThreadButton.mas_bottom).with.offset(20); make.right.mas_equalTo(self.view.mas_right).with.offset(-15); make.height.mas_equalTo(@40); }]; } if(!self.testButton) { self.testButton=[[UIButton alloc]init]; [self.testButton setTitle:@"测试特性" forState:UIControlStateNormal]; self.testButton.backgroundColor=[UIColor blueColor]; [self.view addSubview:self.testButton]; [self.testButton mas_makeConstraints:^(MASConstraintMaker *make) { make.left.mas_equalTo(self.view.mas_left).with.offset(15); make.top.mas_equalTo(self.netWorkButton.mas_bottom).with.offset(20); make.right.mas_equalTo(self.view.mas_right).with.offset(-15); make.height.mas_equalTo(@40); }]; } } 一些定义
//创建一个信号代码 -(RACSignal *)testSignal { RACSignal *signal = [RACSignal createSignal:^ RACDisposable * (id<RACSubscriber> subscriber) { NSLog(@"创建信号"); [subscriber sendNext:@"Hi 我是一个信号"]; [subscriber sendCompleted]; return nil; }]; return signal; } //创建一个命令响应 -(RACCommand *)testCommend { @weakify(self); RACCommand *myCommend=[[RACCommand alloc] initWithSignalBlock:^RACSignal *(id input) { RACSignal *authSignal=[RACSignal empty]; @strongify(self); authSignal=[RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) { //可以根据要求加条件进行判断是否创建信号 if ([self.username isEqualToString:@"wjy"]) { NSLog(@"符合要求"); [subscriber sendNext:@"我完成的命令响应"]; [subscriber sendCompleted]; } else { //错误 [subscriber sendError:[NSError errorWithDomain:@"报错了" code:1 userInfo:nil]]; } return nil; }]; //materialize是为了处理拿不到error的问题 return [authSignal materialize]; }]; return myCommend; } //创建属性的RACCommand -(RACCommand *)otherMyRaccomand { if (!_otherMyRaccomand) { _otherMyRaccomand=[[RACCommand alloc] initWithSignalBlock:^RACSignal *(id input) { NSLog(@"执行到新的RACCommand"); RACSignal *otherSignal=[RACSignal empty]; otherSignal=[RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) { if ([self.username isEqualToString:@"wjy"]) { [subscriber sendNext:@"我肯定可以运行的"]; [subscriber sendCompleted]; } else { [subscriber sendError:[NSError errorWithDomain:@"报错了" code:401 userInfo:nil]]; } return nil; }]; return otherSignal; }]; } return _otherMyRaccomand; } //创建主线程上运行 -(RACCommand *)mainThreadCommend { @weakify(self); if (!_mainThreadCommend) { _mainThreadCommend=[[RACCommand alloc] initWithSignalBlock:^RACSignal *(id input) { RACSignal *authSignal=[RACSignal empty]; @strongify(self); authSignal=[RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) { @strongify(self); //可以根据要求加条件进行判断是否创建信号 if ([self.username isEqualToString:@"wjy"]) { [subscriber sendNext:@(YES)]; [subscriber sendCompleted]; } else { //错误 [subscriber sendError:[NSError errorWithDomain:@"报错了" code:1 userInfo:nil]]; } return nil; }]; return authSignal; }]; } return _mainThreadCommend; } //特性测试 -(RACCommand *)testPropertyCommend { if (!_testPropertyCommend) { } return _testPropertyCommend; } -(RACSignal *)nettestSignal { RACSignal *authSignal=[RACSignal empty]; authSignal=[RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) { LogInApi *reg = [[LogInApi alloc] initWithUsername:self.username password:@"123456"]; [reg startWithCompletionBlockWithSuccess:^(YTKBaseRequest *request) { LoginModel *model=[[LoginModel alloc]initWithString:request.responseString error:nil]; [subscriber sendNext:model]; [subscriber sendCompleted]; } failure:^(YTKBaseRequest *request) { [subscriber sendError:[NSError errorWithDomain:@"报错了" code:1 userInfo:nil]]; }]; return nil; }]; return authSignal; } -(RACSignal *)netSignal { RACSignal *authSignal=[RACSignal empty]; authSignal=[RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) { [subscriber sendNext:@"测试"]; [subscriber sendCompleted]; return nil; }]; return authSignal; } //RACSubject的运用 -(RACSubject *)testSubject { RACSubject *sub=[RACSubject subject]; [sub sendNext:@"我是RACSubject"]; return sub; } 运用的内容：
[self loadPage]; @weakify(self); //把左边的属性跟右边信号signal的sendNext值绑定 distinctUntilChanged为了当值相同时不执行 RAC(self,username)=[self.userNameText.rac_textSignal distinctUntilChanged]; //监听username是否有变化,有变化就会执行subscribeNext 这个属性要支持KVO 可变数组就不可以 [RACObserve(self, username) subscribeNext:^(NSString *x) { NSLog(@"你当前输入的值为：%@",x); }]; //UIAlertView跟RAC结合 UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"" message:@"Alert" delegate:nil cancelButtonTitle:@"取消" otherButtonTitles:@"确定", nil]; [[alertView rac_buttonClickedSignal] subscribeNext:^(NSNumber *indexNumber) { if ([indexNumber intValue] == 1) { NSLog(@"你点了确定"); } else { NSLog(@"你点了取消"); } }]; [alertView show]; //Button响应事件 [[self.loginButton rac_signalForControlEvents:UIControlEventTouchUpInside] subscribeNext:^(UIButton *x) { @strongify(self); [[self testSignal] subscribeNext:^(id x) { NSLog(@"当前执行值为：%@",x); }]; }]; //Button用命令式运行 switchToLatest处理信号中传递的参数为信号 self.racCommendButton.rac_command=[self testCommend]; //这个绑定要放在executionSignals执行前面 否则只会有一个执行完成会响应 [self.racCommendButton.rac_command.executing subscribeNext:^(id x) { if ([x boolValue]) { NSLog(@"rac_command正在执行中"); } else { NSLog(@"rac_command执行完成"); } }]; //dematerialize处理可以响应处理跟完成的内容 [self.racCommendButton.rac_command.executionSignals subscribeNext:^(RACSignal *execution) { [[[execution dematerialize] deliverOn:[RACScheduler mainThreadScheduler]] subscribeNext:^(id x) { NSLog(@"提示内容：%@",x); } error:^(NSError *error) { NSLog(@"racCommend出错了"); }]; }]; //关于otherMyRaccomand的方式 self.errCommendButton.rac_command=self.otherMyRaccomand; [self.otherMyRaccomand.executionSignals.switchToLatest subscribeNext:^(id x) { NSLog(@"完成了 %@",x); }]; //这边要注意是在errors 里面执行subscribeNext 不是执行subscribeError [self.otherMyRaccomand.errors subscribeNext:^(NSError *error) { NSLog(@"出错了 %@",error); }]; //主线程上操作 self.mainThreadButton.rac_command=self.mainThreadCommend; [[[self.mainThreadCommend.executionSignals.switchToLatest map:^id(id value) { if ([value boolValue]) { return @"跳浪帅"; } else { return @"出太阳好么"; } }] deliverOn:[RACScheduler mainThreadScheduler]] subscribeNext:^(NSString *str) { UIAlertView *alert=[[UIAlertView alloc]initWithTitle:@"我是弹出窗" message:[NSString stringWithFormat:@"%@",str] delegate:nil cancelButtonTitle:@"取消" otherButtonTitles:@"确定", nil]; [alert show]; }]; //网络请求 //Button响应事件 [[self.netWorkButton rac_signalForControlEvents:UIControlEventTouchUpInside] subscribeNext:^(id x) { [[[self netSignal] flattenMap:^RACStream *(id value) { return [RACReturnSignal return:[NSString stringWithFormat:@"%@ 我已经被改变了成为另外一个信号",value]]; }] subscribeNext:^(id x) { NSLog(@"输出的内容:%@",x); }]; }]; 因为代码中已经有相应的注解，所以文字说明就比较少，若有不明白可以留言；