ReactiveCocoa学习

转载：http://ios.jobbole.com/82356/

前戏

我个人非常推崇ReactiveCocoa，它就像中国的太极，太极生两仪，两仪生四象，四象生八卦，八卦生万物。ReactiveCocoa是一个高度抽象的编程框架，它真的很抽象，初看你不知道它是要干嘛的，等你用上了之后，就发现，有了它你是想干嘛就干嘛，编码从未如此流畅。

在此我不会讲ReactiveCocoa的原理，因为不能讲明白的才叫抽象。我也不会提及相关概念。我只是让你看看我用着它是有多爽。

代码的四十八手

察值

你别动，你一动我就知道。

Objective-C

@weakify(self); [RACObserve(self, value) subscribeNext:^(NSString* x) { @strongify(self); NSLog(@"你动了"); }];

1 2 3 4 5

@weakify(self); [RACObserve(self,value) subscribeNext:^(NSString*x){     @strongify(self);     NSLog(@"你动了"); }];

单边

你唱歌，我就跳舞。

textField的内容长度隐射成BOOL值，绑定到confirmButton的enable属性上面，当textField输入内容不为空的时候，confirmButton的enable = YES。

Objective-C

RACSignal *signalA = [RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) { [subscriber sendNext:@"唱歌"]; [subscriber sendCompleted]; return nil; }]; RAC(self, value) = [signalA map:^id(NSString* value) { if ([value isEqualToString:@"唱歌"]) { return @"跳舞"; } return @""; }];

1 2 3 4 5 6 7 8 9 10 11

RACSignal*signalA =[RACSignal createSignal:^RACDisposable*(id<RACSubscriber>subscriber){         [subscriber sendNext:@"唱歌"];         [subscribersendCompleted];         returnnil;     }];     RAC(self,value)= [signalA map:^id(NSString*value){         if([value isEqualToString:@"唱歌"]){             return@"跳舞";         }         return@"";     }];

双边

你向西，他就向东，他向左，你就向右。

Objective-C

RACChannelTerminal *channelA = RACChannelTo(self, valueA); RACChannelTerminal *channelB = RACChannelTo(self, valueB); [[channelA map:^id(NSString *value) { if ([value isEqualToString:@"西"]) { return @"东"; } return value; }] subscribe:channelB]; [[channelB map:^id(NSString *value) { if ([value isEqualToString:@"左"]) { return @"右"; } return value; }] subscribe:channelA]; [[RACObserve(self, valueA) filter:^BOOL(id value) { return value ? YES : NO; }] subscribeNext:^(NSString* x) { NSLog(@"你向%@", x); }]; [[RACObserve(self, valueB) filter:^BOOL(id value) { return value ? YES : NO; }] subscribeNext:^(NSString* x) { NSLog(@"他向%@", x); }]; self.valueA = @"西"; self.valueB = @"左";

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26

RACChannelTerminal*channelA =RACChannelTo(self,valueA);     RACChannelTerminal*channelB =RACChannelTo(self,valueB);     [[channelA map:^id(NSString*value){         if([value isEqualToString:@"西"]){             return@"东";         }         returnvalue;     }] subscribe:channelB];     [[channelB map:^id(NSString*value){         if([value isEqualToString:@"左"]){             return@"右";         }         returnvalue;     }] subscribe:channelA];     [[RACObserve(self,valueA) filter:^BOOL(idvalue){         returnvalue ? YES: NO;     }] subscribeNext:^(NSString*x){         NSLog(@"你向%@",x);     }];     [[RACObserve(self,valueB) filter:^BOOL(idvalue){         returnvalue ? YES: NO;     }] subscribeNext:^(NSString*x){         NSLog(@"他向%@",x);     }];     self.valueA= @"西";     self.valueB= @"左";

Objective-C

2015-08-15 20:14:46.544 Test[2440:99901] 你向西 2015-08-15 20:14:46.544 Test[2440:99901] 他向东 2015-08-15 20:14:46.545 Test[2440:99901] 他向左 2015-08-15 20:14:46.545 Test[2440:99901] 你向右

1 2 3 4

2015-08-1520:14:46.544Test[2440:99901]你向西   2015-08-1520:14:46.544Test[2440:99901]他向东   2015-08-1520:14:46.545Test[2440:99901]他向左   2015-08-1520:14:46.545Test[2440:99901]你向右

代理

你是程序员，你帮我写个app吧。

Objective-C

@protocol Programmer <NSObject> - (void)makeAnApp; @end

1 2 3

@protocolProgrammer <NSObject> - (void)makeAnApp; @end

Objective-C

RACSignal *ProgrammerSignal = [self rac_signalForSelector:@selector(makeAnApp) fromProtocol:@protocol(Programmer)]; [ProgrammerSignal subscribeNext:^(RACTuple* x) { NSLog(@"花了一个月，app写好了"); }]; [self makeAnApp];

1 2 3 4 5 6 7

RACSignal*ProgrammerSignal =   [self rac_signalForSelector:@selector(makeAnApp)                fromProtocol:@protocol(Programmer)]; [ProgrammerSignal subscribeNext:^(RACTuple*x){     NSLog(@"花了一个月，app写好了"); }]; [selfmakeAnApp];

Objective-C

2015-08-15 20:46:45.720 Test[2817:114564] 花了一个月，app写好了

1	2015-08-1520:46:45.720Test[2817:114564]花了一个月，app写好了

广播

知道你的频道，我就能听到你了。

Objective-C

[[[NSNotificationCenter defaultCenter] rac_addObserverForName:@"代码之道频道" object:nil] subscribeNext:^(NSNotification* x) { NSLog(@"技巧：%@", x.userInfo[@"技巧"]); }]; [[NSNotificationCenter defaultCenter] postNotificationName:@"代码之道频道" object:nil userInfo:@{@"技巧":@"用心写"}];

1 2 3 4

[[[NSNotificationCenterdefaultCenter] rac_addObserverForName:@"代码之道频道" object:nil] subscribeNext:^(NSNotification*x){         NSLog(@"技巧：%@",x.userInfo[@"技巧"]);     }];     [[NSNotificationCenterdefaultCenter] postNotificationName:@"代码之道频道" object:nil userInfo:@{@"技巧":@"用心写"}];

Objective-C

2015-08-15 20:41:15.786 Test[2734:111505] 技巧：用心写

1	2015-08-1520:41:15.786Test[2734:111505]技巧：用心写

连接

生活是一个故事接一个故事。

Objective-C

RACSignal *signalA = [RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) { [subscriber sendNext:@"我恋爱啦"]; [subscriber sendCompleted]; return nil; }]; RACSignal *signalB = [RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) { [subscriber sendNext:@"我结婚啦"]; [subscriber sendCompleted]; return nil; }]; [[signalA concat:signalB] subscribeNext:^(id x) { NSLog(@"%@",x); }];

1 2 3 4 5 6 7 8 9 10 11 12 13

RACSignal*signalA =[RACSignal createSignal:^RACDisposable*(id<RACSubscriber>subscriber){         [subscriber sendNext:@"我恋爱啦"];         [subscribersendCompleted];         returnnil;     }];     RACSignal*signalB =[RACSignal createSignal:^RACDisposable*(id<RACSubscriber>subscriber){         [subscriber sendNext:@"我结婚啦"];         [subscribersendCompleted];         returnnil;     }];     [[signalA concat:signalB] subscribeNext:^(idx){         NSLog(@"%@",x);     }];

Objective-C

2015-08-15 12:19:46.707 Test[1845:64122] 我恋爱啦 2015-08-15 12:19:46.707 Test[1845:64122] 我结婚啦

1 2	2015-08-1512:19:46.707Test[1845:64122]我恋爱啦   2015-08-1512:19:46.707Test[1845:64122]我结婚啦

合并

污水都应该流入污水处理厂被处理。

Objective-C

RACSignal *signalA = [RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) { [subscriber sendNext:@"纸厂污水"]; return nil; }]; RACSignal *signalB = [RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) { [subscriber sendNext:@"电镀厂污水"]; return nil; }]; [[RACSignal merge:@[signalA, signalB]] subscribeNext:^(id x) { NSLog(@"处理%@",x); }];

1 2 3 4 5 6 7 8 9 10 11

RACSignal*signalA =[RACSignal createSignal:^RACDisposable*(id<RACSubscriber>subscriber){         [subscriber sendNext:@"纸厂污水"];         returnnil;     }];     RACSignal*signalB =[RACSignal createSignal:^RACDisposable*(id<RACSubscriber>subscriber){         [subscriber sendNext:@"电镀厂污水"];         returnnil;     }];     [[RACSignal merge:@[signalA,signalB]] subscribeNext:^(idx){         NSLog(@"处理%@",x);     }];

Objective-C

2015-08-15 12:10:05.371 Test[1770:60147] 处理纸厂污水 2015-08-15 12:10:05.372 Test[1770:60147] 处理电镀厂污水

1 2	2015-08-1512:10:05.371Test[1770:60147]处理纸厂污水   2015-08-1512:10:05.372Test[1770:60147]处理电镀厂污水

组合

你是红的，我是黄的，我们就是红黄的，你是白的，我没变，我们是白黄的。

Objective-C

RACSignal *signalA = [RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) { [subscriber sendNext:@"红"]; [subscriber sendNext:@"白"]; return nil; }]; RACSignal *signalB = [RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) { [subscriber sendNext:@"白"]; return nil; }]; [[RACSignal combineLatest:@[signalA, signalB]] subscribeNext:^(RACTuple* x) { RACTupleUnpack(NSString *stringA, NSString *stringB) = x; NSLog(@"我们是%@%@的", stringA, stringB); }];

1 2 3 4 5 6 7 8 9 10 11 12 13

RACSignal*signalA =[RACSignal createSignal:^RACDisposable*(id<RACSubscriber>subscriber){         [subscriber sendNext:@"红"];         [subscriber sendNext:@"白"];         returnnil;     }];     RACSignal*signalB =[RACSignal createSignal:^RACDisposable*(id<RACSubscriber>subscriber){         [subscriber sendNext:@"白"];         returnnil;     }];     [[RACSignal combineLatest:@[signalA,signalB]] subscribeNext:^(RACTuple*x){         RACTupleUnpack(NSString*stringA,NSString *stringB)= x;         NSLog(@"我们是%@%@的",stringA,stringB);     }];

Objective-C

2015-08-15 12:14:19.837 Test[1808:62042] 我们就是红黄的 2015-08-15 12:14:19.837 Test[1808:62042] 我们是白黄的

1 2	2015-08-1512:14:19.837Test[1808:62042]我们就是红黄的   2015-08-1512:14:19.837Test[1808:62042]我们是白黄的

压缩

你是红的，我是黄的，我们就是红黄的，你是白的，我没变，哦，那就等我变了再说吧。

Objective-C

RACSignal *signalA = [RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) { [subscriber sendNext:@"红"]; [subscriber sendNext:@"白"]; return nil; }]; RACSignal *signalB = [RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) { [subscriber sendNext:@"白"]; return nil; }]; [[signalA zipWith:signalB] subscribeNext:^(RACTuple* x) { RACTupleUnpack(NSString *stringA, NSString *stringB) = x; NSLog(@"我们是%@%@的", stringA, stringB); }];

1 2 3 4 5 6 7 8 9 10 11 12 13

RACSignal*signalA =[RACSignal createSignal:^RACDisposable*(id<RACSubscriber>subscriber){         [subscriber sendNext:@"红"];         [subscriber sendNext:@"白"];         returnnil;     }];     RACSignal*signalB =[RACSignal createSignal:^RACDisposable*(id<RACSubscriber>subscriber){         [subscriber sendNext:@"白"];         returnnil;     }];     [[signalA zipWith:signalB] subscribeNext:^(RACTuple*x){         RACTupleUnpack(NSString*stringA,NSString *stringB)= x;         NSLog(@"我们是%@%@的",stringA,stringB);     }];

Objective-C

2015-08-15 20:34:24.274 Test[2660:108483] 我们是红白的

1	2015-08-1520:34:24.274Test[2660:108483]我们是红白的

映射

我可以点石成金。

Objective-C

RACSignal *signal = [[RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) { [subscriber sendNext:@"石"]; return nil; }] map:^id(NSString* value) { if ([value isEqualToString:@"石"]) { return @"金"; } return value; }]; [signal subscribeNext:^(id x) { NSLog(@"%@", x); }];

1 2 3 4 5 6 7 8 9 10 11 12

RACSignal*signal =[[RACSignal createSignal:^RACDisposable*(id<RACSubscriber>subscriber){         [subscriber sendNext:@"石"];         returnnil;     }] map:^id(NSString*value){         if([value isEqualToString:@"石"]){             return@"金";         }         returnvalue;     }];     [signal subscribeNext:^(idx){         NSLog(@"%@",x);     }];

Objective-C

2015-08-16 20:00:12.853 Test[740:15871] 金

1	2015-08-1620:00:12.853Test[740:15871]金

归约

糖加水变成糖水。

Objective-C

RACSignal *sugarSignal = [RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) { [subscriber sendNext:@"糖"]; return nil; }]; RACSignal *waterSignal = [RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) { [subscriber sendNext:@"水"]; return nil; }]; [[RACSignal combineLatest:@[sugarSignal, waterSignal] reduce:^id (NSString* sugar, NSString*water){ return [sugar stringByAppendingString:water]; }] subscribeNext:^(id x) { NSLog(@"%@", x); }];

1 2 3 4 5 6 7 8 9 10 11 12 13

RACSignal*sugarSignal =[RACSignal createSignal:^RACDisposable*(id<RACSubscriber>subscriber){         [subscriber sendNext:@"糖"];         returnnil;     }];     RACSignal*waterSignal =[RACSignal createSignal:^RACDisposable*(id<RACSubscriber>subscriber){         [subscriber sendNext:@"水"];         returnnil;     }];     [[RACSignal combineLatest:@[sugarSignal,waterSignal] reduce:^id(NSString*sugar,NSString*water){         return[sugar stringByAppendingString:water];     }] subscribeNext:^(idx){         NSLog(@"%@",x);     }];

Objective-C

2015-08-16 20:07:00.356 Test[807:19177] 糖水

1	2015-08-1620:07:00.356Test[807:19177]糖水

过滤

未满十八岁，禁止进入。

Objective-C

[[[RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) { [subscriber sendNext:@(15)]; [subscriber sendNext:@(17)]; [subscriber sendNext:@(21)]; [subscriber sendNext:@(14)]; [subscriber sendNext:@(30)]; return nil; }] filter:^BOOL(NSNumber* value) { return value.integerValue >= 18; }] subscribeNext:^(id x) { NSLog(@"%@", x); }];

1 2 3 4 5 6 7 8 9 10 11 12

[[[RACSignal createSignal:^RACDisposable*(id<RACSubscriber>subscriber){         [subscriber sendNext:@(15)];         [subscriber sendNext:@(17)];         [subscriber sendNext:@(21)];         [subscriber sendNext:@(14)];         [subscriber sendNext:@(30)];         returnnil;     }] filter:^BOOL(NSNumber*value){         returnvalue.integerValue>= 18;     }] subscribeNext:^(idx){         NSLog(@"%@",x);     }];

Objective-C

2015-08-16 20:11:20.071 Test[860:21214] 21 2015-08-16 20:11:20.071 Test[860:21214] 30

1 2	2015-08-1620:11:20.071Test[860:21214] 21   2015-08-1620:11:20.071Test[860:21214] 30

扁平

打蛋液，煎鸡蛋，上盘。

Objective-C

[[[[RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) { NSLog(@"打蛋液"); [subscriber sendNext:@"蛋液"]; [subscriber sendCompleted]; return nil; }] flattenMap:^RACStream *(NSString* value) { return [RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) { NSLog(@"把%@倒进锅里面煎",value); [subscriber sendNext:@"煎蛋"]; [subscriber sendCompleted]; return nil; }]; }] flattenMap:^RACStream *(NSString* value) { return [RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) { NSLog(@"把%@装到盘里", value); [subscriber sendNext:@"上菜"]; [subscriber sendCompleted]; return nil; }]; }] subscribeNext:^(id x) { NSLog(@"%@", x); }];

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22

[[[[RACSignal createSignal:^RACDisposable*(id<RACSubscriber>subscriber){         NSLog(@"打蛋液");         [subscriber sendNext:@"蛋液"];         [subscribersendCompleted];         returnnil;     }] flattenMap:^RACStream*(NSString*value){         return[RACSignal createSignal:^RACDisposable*(id<RACSubscriber>subscriber){             NSLog(@"把%@倒进锅里面煎",value);             [subscriber sendNext:@"煎蛋"];             [subscribersendCompleted];             returnnil;         }];     }] flattenMap:^RACStream*(NSString*value){         return[RACSignal createSignal:^RACDisposable*(id<RACSubscriber>subscriber){             NSLog(@"把%@装到盘里",value);             [subscriber sendNext:@"上菜"];             [subscribersendCompleted];             returnnil;         }];     }] subscribeNext:^(idx){         NSLog(@"%@",x);     }];

Objective-C

2015-08-16 20:39:34.786 Test[1226:34386] 打蛋液 2015-08-16 20:39:34.787 Test[1226:34386] 把蛋液倒进锅里面煎 2015-08-16 20:39:34.787 Test[1226:34386] 把煎蛋装到盘里 2015-08-16 20:39:34.787 Test[1226:34386] 上菜

1 2 3 4

2015-08-1620:39:34.786Test[1226:34386]打蛋液   2015-08-1620:39:34.787Test[1226:34386]把蛋液倒进锅里面煎   2015-08-1620:39:34.787Test[1226:34386]把煎蛋装到盘里   2015-08-1620:39:34.787Test[1226:34386]上菜

秩序

把大象塞进冰箱只需要三步：打开冰箱门，把大象塞进冰箱，关上冰箱门。

Objective-C

[[[[RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) { NSLog(@"打开冰箱门"); [subscriber sendCompleted]; return nil; }] then:^RACSignal *{ return [RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) { NSLog(@"把大象塞进冰箱"); [subscriber sendCompleted]; return nil; }]; }] then:^RACSignal *{ return [RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) { NSLog(@"关上冰箱门"); [subscriber sendCompleted]; return nil; }]; }] subscribeCompleted:^{ NSLog(@"把大象塞进冰箱了"); }];

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19

[[[[RACSignal createSignal:^RACDisposable*(id<RACSubscriber>subscriber){         NSLog(@"打开冰箱门");         [subscribersendCompleted];         returnnil;     }] then:^RACSignal*{        return[RACSignal createSignal:^RACDisposable*(id<RACSubscriber>subscriber){           NSLog(@"把大象塞进冰箱");            [subscribersendCompleted];           return nil;        }];     }] then:^RACSignal*{         return[RACSignal createSignal:^RACDisposable*(id<RACSubscriber>subscriber){             NSLog(@"关上冰箱门");             [subscribersendCompleted];             returnnil;         }];     }] subscribeCompleted:^{         NSLog(@"把大象塞进冰箱了");     }];

Objective-C

2015-08-16 20:45:27.724 Test[1334:37870] 打开冰箱门 2015-08-16 20:45:27.725 Test[1334:37870] 把大象塞进冰箱 2015-08-16 20:45:27.725 Test[1334:37870] 关上冰箱门 2015-08-16 20:45:27.726 Test[1334:37870] 把大象塞进冰箱了

1 2 3 4

2015-08-1620:45:27.724Test[1334:37870]打开冰箱门   2015-08-1620:45:27.725Test[1334:37870]把大象塞进冰箱   2015-08-1620:45:27.725Test[1334:37870]关上冰箱门   2015-08-1620:45:27.726Test[1334:37870]把大象塞进冰箱了

命令

我命令你马上投降。

 

Objective-C

RACCommand *aCommand = [[RACCommand alloc] initWithSignalBlock:^RACSignal *(id input) { return [RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) { NSLog(@"我投降了"); [subscriber sendCompleted]; return nil; }]; }]; [aCommand execute:nil];

1 2 3 4 5 6 7 8

RACCommand*aCommand =[[RACCommandalloc] initWithSignalBlock:^RACSignal*(idinput){        return[RACSignal createSignal:^RACDisposable*(id<RACSubscriber>subscriber){           NSLog(@"我投降了");            [subscribersendCompleted];           return nil;        }];     }];     [aCommand execute:nil];

Objective-C

2015-08-16 20:54:32.492 Test[1450:41849] 我投降了

1	2015-08-1620:54:32.492Test[1450:41849]我投降了

延迟

等等我，我还有10秒钟就到了。

Objective-C

[[[RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) { NSLog(@"等等我，我还有10秒钟就到了"); [subscriber sendNext:nil]; [subscriber sendCompleted]; return nil; }] delay:10] subscribeNext:^(id x) { NSLog(@"我到了"); }];

1 2 3 4 5 6 7 8

[[[RACSignal createSignal:^RACDisposable*(id<RACSubscriber>subscriber){         NSLog(@"等等我，我还有10秒钟就到了");         [subscriber sendNext:nil];         [subscribersendCompleted];         returnnil;     }] delay:10] subscribeNext:^(idx){         NSLog(@"我到了");     }];

Objective-C

2015-08-16 21:00:57.622 Test[1619:45924] 等等我，我还有10秒钟就到了 2015-08-16 21:01:07.624 Test[1619:45924] 我到了

1 2	2015-08-1621:00:57.622Test[1619:45924]等等我，我还有10秒钟就到了   2015-08-1621:01:07.624Test[1619:45924]我到了

重放

一次制作，多次观看。

Objective-C

RACSignal *replaySignal = [[RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) { NSLog(@"大导演拍了一部电影《我的男票是程序员》"); [subscriber sendNext:@"《我的男票是程序员》"]; return nil; }] replay]; [replaySignal subscribeNext:^(id x) { NSLog(@"小明看了%@", x); }]; [replaySignal subscribeNext:^(id x) { NSLog(@"小红也看了%@", x); }];

1 2 3 4 5 6 7 8 9 10 11

RACSignal*replaySignal = [[RACSignal createSignal:^RACDisposable*(id<RACSubscriber>subscriber){         NSLog(@"大导演拍了一部电影《我的男票是程序员》");         [subscriber sendNext:@"《我的男票是程序员》"];         returnnil;     }] replay];     [replaySignal subscribeNext:^(idx){         NSLog(@"小明看了%@",x);     }];     [replaySignal subscribeNext:^(idx){         NSLog(@"小红也看了%@",x);     }];

Objective-C

2015-08-16 21:18:38.002 Test[1854:54712] 大导演拍了一部电影《我的男票是程序员》 2015-08-16 21:18:38.004 Test[1854:54712] 小明看了《我的男票是程序员》 2015-08-16 21:18:38.004 Test[1854:54712] 小红也看了《我的男票是程序员》

1 2 3

2015-08-1621:18:38.002Test[1854:54712]大导演拍了一部电影《我的男票是程序员》   2015-08-1621:18:38.004Test[1854:54712]小明看了《我的男票是程序员》   2015-08-1621:18:38.004Test[1854:54712]小红也看了《我的男票是程序员》

定时

每隔8个小时服一次药。

Objective-C

[[RACSignal interval:60*60*8 onScheduler:[RACScheduler mainThreadScheduler]] subscribeNext:^(id x) { NSLog(@"吃药"); }];

1 2 3

[[RACSignal interval:60*60*8 onScheduler:[RACSchedulermainThreadScheduler]] subscribeNext:^(idx){         NSLog(@"吃药");     }];

超时

等了你一个小时了，你还没来，我走了。

Objective-C

[[[RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) { [[[RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) { NSLog(@"我快到了"); [subscriber sendNext:nil]; [subscriber sendCompleted]; return nil; }] delay:60*70] subscribeNext:^(id x) { [subscriber sendNext:nil]; [subscriber sendCompleted]; }]; return nil; }] timeout:60*60 onScheduler:[RACScheduler mainThreadScheduler]] subscribeError:^(NSError *error) { NSLog(@"等了你一个小时了，你还没来，我走了"); }];

1 2 3 4 5 6 7 8 9 10 11 12 13 14

[[[RACSignal createSignal:^RACDisposable*(id<RACSubscriber>subscriber){         [[[RACSignal createSignal:^RACDisposable*(id<RACSubscriber>subscriber){             NSLog(@"我快到了");             [subscriber sendNext:nil];             [subscribersendCompleted];             returnnil;         }] delay:60*70] subscribeNext:^(idx){             [subscriber sendNext:nil];             [subscribersendCompleted];         }];         returnnil;     }] timeout:60*60 onScheduler:[RACSchedulermainThreadScheduler]] subscribeError:^(NSError*error){         NSLog(@"等了你一个小时了，你还没来，我走了");     }];

Objective-C

2015-08-16 21:40:09.068 Test[2041:64720] 我快到了 2015-08-16 22:40:10.048 Test[2041:64720] 等了你一个小时了，你还没来，我走了

1 2	2015-08-1621:40:09.068Test[2041:64720]我快到了   2015-08-1622:40:10.048Test[2041:64720]等了你一个小时了，你还没来，我走了

重试

成功之前可能需要数百次失败。

Objective-C

__block int failedCount = 0; [[[RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) { if (failedCount < 100) { failedCount++; NSLog(@"我失败了"); [subscriber sendError:nil]; }else{ NSLog(@"经历了数百次失败后"); [subscriber sendNext:nil]; } return nil; }] retry] subscribeNext:^(id x) { NSLog(@"终于成功了"); }];

1 2 3 4 5 6 7 8 9 10 11 12 13 14

__blockint failedCount= 0;     [[[RACSignal createSignal:^RACDisposable*(id<RACSubscriber>subscriber){         if(failedCount< 100){             failedCount++;             NSLog(@"我失败了");             [subscriber sendError:nil];         }else{             NSLog(@"经历了数百次失败后");             [subscriber sendNext:nil];         }         returnnil;     }] retry] subscribeNext:^(idx){         NSLog(@"终于成功了");     }];

Objective-C

2015-08-16 21:59:07.159 Test[2411:77080] 我失败了 2015-08-16 21:59:07.159 Test[2411:77080] 我失败了 2015-08-16 21:59:07.159 Test[2411:77080] 我失败了 2015-08-16 21:59:07.159 Test[2411:77080] 我失败了 2015-08-16 21:59:07.160 Test[2411:77080] 我失败了 2015-08-16 21:59:07.160 Test[2411:77080] 我失败了 2015-08-16 21:59:07.161 Test[2411:77080] 我失败了 2015-08-16 21:59:07.162 Test[2411:77080] 我失败了 ... 2015-08-16 21:59:07.162 Test[2411:77080] 我失败了 2015-08-16 21:59:07.163 Test[2411:77080] 我失败了 2015-08-16 21:59:07.163 Test[2411:77080] 我失败了 2015-08-16 21:59:07.163 Test[2411:77080] 我失败了 2015-08-16 21:59:07.164 Test[2411:77080] 我失败了 2015-08-16 21:59:07.164 Test[2411:77080] 我失败了 2015-08-16 21:59:07.164 Test[2411:77080] 我失败了 2015-08-16 21:59:07.165 Test[2411:77080] 经历了数百次失败后 2015-08-16 21:59:07.165 Test[2411:77080] 终于成功了

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18

2015-08-1621:59:07.159Test[2411:77080]我失败了   2015-08-1621:59:07.159Test[2411:77080]我失败了   2015-08-1621:59:07.159Test[2411:77080]我失败了   2015-08-1621:59:07.159Test[2411:77080]我失败了   2015-08-1621:59:07.160Test[2411:77080]我失败了   2015-08-1621:59:07.160Test[2411:77080]我失败了   2015-08-1621:59:07.161Test[2411:77080]我失败了   2015-08-1621:59:07.162Test[2411:77080]我失败了   ... 2015-08-1621:59:07.162Test[2411:77080]我失败了   2015-08-1621:59:07.163Test[2411:77080]我失败了   2015-08-1621:59:07.163Test[2411:77080]我失败了   2015-08-1621:59:07.163Test[2411:77080]我失败了   2015-08-1621:59:07.164Test[2411:77080]我失败了   2015-08-1621:59:07.164Test[2411:77080]我失败了   2015-08-1621:59:07.164Test[2411:77080]我失败了   2015-08-1621:59:07.165Test[2411:77080]经历了数百次失败后   2015-08-1621:59:07.165Test[2411:77080]终于成功了

节流

不好意思，这里一秒钟只能通过一个人。

Objective-C

[[[RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) { [subscriber sendNext:@"旅客A"]; dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(1 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{ [subscriber sendNext:@"旅客B"]; }); dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(2 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{ [subscriber sendNext:@"旅客C"]; [subscriber sendNext:@"旅客D"]; [subscriber sendNext:@"旅客E"]; }); dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(3 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{ [subscriber sendNext:@"旅客F"]; }); return nil; }] throttle:1] subscribeNext:^(id x) { NSLog(@"%@通过了",x); }];

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17

[[[RACSignal createSignal:^RACDisposable*(id<RACSubscriber>subscriber){         [subscriber sendNext:@"旅客A"];         dispatch_after(dispatch_time(DISPATCH_TIME_NOW,(int64_t)(1* NSEC_PER_SEC)),dispatch_get_main_queue(),^{             [subscriber sendNext:@"旅客B"];         });         dispatch_after(dispatch_time(DISPATCH_TIME_NOW,(int64_t)(2* NSEC_PER_SEC)),dispatch_get_main_queue(),^{             [subscriber sendNext:@"旅客C"];             [subscriber sendNext:@"旅客D"];             [subscriber sendNext:@"旅客E"];         });         dispatch_after(dispatch_time(DISPATCH_TIME_NOW,(int64_t)(3* NSEC_PER_SEC)),dispatch_get_main_queue(),^{             [subscriber sendNext:@"旅客F"];         });         returnnil;     }] throttle:1] subscribeNext:^(idx){         NSLog(@"%@通过了",x);     }];

Objective-C

2015-08-16 22:08:45.677 Test[2618:83764] 旅客A 2015-08-16 22:08:46.737 Test[2618:83764] 旅客B 2015-08-16 22:08:47.822 Test[2618:83764] 旅客E 2015-08-16 22:08:48.920 Test[2618:83764] 旅客F

1 2 3 4

2015-08-1622:08:45.677Test[2618:83764]旅客A   2015-08-1622:08:46.737Test[2618:83764]旅客B   2015-08-1622:08:47.822Test[2618:83764]旅客E   2015-08-1622:08:48.920Test[2618:83764]旅客F

条件

直到世界的尽头才能把我们

Objective-C

[[[RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) { [[RACSignal interval:1 onScheduler:[RACScheduler mainThreadScheduler]] subscribeNext:^(id x) { [subscriber sendNext:@"直到世界的尽头才能把我们分开"]; }]; return nil; }] takeUntil:[RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) { dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(5 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{ NSLog(@"世界的尽头到了"); [subscriber sendNext:@"世界的尽头到了"]; }); return nil; }]] subscribeNext:^(id x) { NSLog(@"%@", x); }];

1 2 3 4 5 6 7 8 9 10 11 12 13 14

[[[RACSignal createSignal:^RACDisposable*(id<RACSubscriber>subscriber){         [[RACSignal interval:1 onScheduler:[RACSchedulermainThreadScheduler]] subscribeNext:^(idx){             [subscriber sendNext:@"直到世界的尽头才能把我们分开"];         }];         returnnil;     }] takeUntil:[RACSignal createSignal:^RACDisposable*(id<RACSubscriber>subscriber){         dispatch_after(dispatch_time(DISPATCH_TIME_NOW,(int64_t)(5* NSEC_PER_SEC)),dispatch_get_main_queue(),^{             NSLog(@"世界的尽头到了");             [subscriber sendNext:@"世界的尽头到了"];         });         returnnil;     }]] subscribeNext:^(idx){         NSLog(@"%@",x);     }];

 

Objective-C

2015-08-16 22:17:22.648 Test[2766:88737] 直到世界的尽头才能把我们分开 2015-08-16 22:17:23.648 Test[2766:88737] 直到世界的尽头才能把我们分开 2015-08-16 22:17:24.645 Test[2766:88737] 直到世界的尽头才能把我们分开 2015-08-16 22:17:25.648 Test[2766:88737] 直到世界的尽头才能把我们分开 2015-08-16 22:17:26.644 Test[2766:88737] 直到世界的尽头才能把我们分开 2015-08-16 22:17:26.645 Test[2766:88737] 世界的尽头到了

1 2 3 4 5 6

2015-08-1622:17:22.648Test[2766:88737]直到世界的尽头才能把我们分开   2015-08-1622:17:23.648Test[2766:88737]直到世界的尽头才能把我们分开   2015-08-1622:17:24.645Test[2766:88737]直到世界的尽头才能把我们分开   2015-08-1622:17:25.648Test[2766:88737]直到世界的尽头才能把我们分开   2015-08-1622:17:26.644Test[2766:88737]直到世界的尽头才能把我们分开   2015-08-1622:17:26.645Test[2766:88737]世界的尽头到了

完事

ReactiveCocoa是如此优雅，一旦使用，根本停不下来，上面也只是它的一角冰山，但愿我能挑起你的兴趣。