reactivecocoa笔记

RACSignal

• 值操作 map

例：
RACSignal *signalB = [signalA map:^id(NSNumber *value){
      return @(value.integerValue*2);
}];

• 值操作 mapReplace

例：
RACSignal *signalC = [singnalA mapReplace:@8];

• 值操作 reduceEach只能用在元祖上

例子：f(x,y) = x + y
RACSignal *signalD = [signalA reduceEach:^id(NSNumber *first,NSNumber *second){
      return @(first.integerValue + second.integerValue);
}]

• 值操作 - 其他

-(RACSignal*)not
-(RACSignal*)and
-(RACSignal*)or 
-(RACSignal*)reduceApply
-(RACSignal*)materrialize
-(RACSignal*)dematerialize

• 数量操作

-(RACSignal*) filter
-(RACSignal*)ignore
-(RACSignal*)ignoreVlues
-(RACSignal*)distinctUntilchanged  //去重
-(RACSignal*)take 
例子：
RACSignal *signalB = [signalA take:2];
-(RACSignal*)skip
例子：
RACSingal *sinalC = [signalA skip:1];

• 数量操作-take&skip 其他

- (RACSignal *)takeLast:(NSUInteger)count ;
- (RACSignal<ValueType> *)takeUntilBlock:(BOOL (^)(ValueType _Nullable x))predicate;
- (RACSignal<ValueType> *)takeWhileBlock:(BOOL (^)(ValueType _Nullable x))predicate;
- (RACSignal<ValueType> *)skipUntilBlock:(BOOL (^)(ValueType _Nullable x))predicate;
- (RACSignal<ValueType> *)skipWhileBlock:(BOOL (^)(ValueType _Nullable x))predicate;

• 一些混合操作

- (RACSignal *)all:(BOOL (^)(id object))predicateBlock ；
- (RACSignal *)any:(BOOL (^)(id object))predicateBlock ；
- (RACSignal *)any；

• 数量操作

  • startWith：

例子：
RACSignal *signalB = [signalA startWith:@"start"];

  * repeat：

例子：
RACSignal *signalB = [signalA repeat];

``

• retry：

用于网络获取。
RACSignal *signalB = [signalA retry];
直到成功为止

• collect

例子
RACSignal *signalB = [signalA collect];

• aggregate

汇聚  折叠
      RACSignal * signalA = [RACSignal createSignal:^RACDisposable * _Nullable(id<RACSubscriber>  _Nonnull subscriber) {
        [subscriber sendNext:@"1"];
        [subscriber sendNext:@"6"];
        [subscriber sendNext:@"9"];
        [subscriber sendNext:@"10"];
        [subscriber sendCompleted];
        return [RACDisposable disposableWithBlock:^{

        }];
    }];
    RACSignal *signalB = [signalA aggregateWithStart:@0 reduce:^id _Nonnull(NSNumber  * _Nonnull running, NSNumber  * _Nonnull next) {
        return @(running.integerValue + next.integerValue);
    }];
    [signalB subscribeNext:^(id  _Nullable x) {
        NSLog(@"%@",x);
    } completed:^{

    }];
    2018-11-13 15:54:06.977523+0800 TestReativeCocoa[22678:440319] 26

• scan

        RACSignal *signalC = [signalA scanWithStart:@0 reduce:^id _Nullable(NSNumber *  _Nullable running, NSNumber *  _Nullable next) {
        return @(running.integerValue + next.integerValue);
    }];
    [signalC subscribeNext:^(id  _Nullable x) {
        NSLog(@"%@",x);
    } completed:^{
  
    }];
    2018-11-13 16:16:53.069082+0800 TestReativeCocoa[23136:450557] 1
    2018-11-13 16:16:53.069206+0800 TestReativeCocoa[23136:450557] 7
    2018-11-13 16:16:53.069326+0800 TestReativeCocoa[23136:450557] 16
    2018-11-13 16:16:53.069443+0800 TestReativeCocoa[23136:450557] 26
  

• 时间操作 dely

    RACSignal *signalD = [signalA delay:1];
    RACSignal *interalSignal = [[[RACSignal return:@1]delay:1]repeat];

• 时间操作 throttle

        RACSignal *throttleSignal = [signalA throttle:2];
        2秒时间无新信号 发出
        网络请求防重操作
      - (RACSignal *)throttle:(NSTimeInterval)interval valuesPassingTest:(BOOL (^)(id next))predicate ；
      - (RACSignal *)bufferWithTime:(NSTimeInterval)interval onScheduler:(RACScheduler *)scheduler ；

• 组合操作 - concat

      RACSignal *sigalE = [signalA concat:signalC];
      链接

• 组合操作 - merge

      RACSignal *signalF = [signalA merge:signalB];
      signalF = [RACSignal merge:@[signalA,signalB]];
      signalF = [RACSignal merge:RACTuplePack(signalA,signalB)];

• 组合操作-zip 拉链

   两个信号打包
RACSignal *signalG = [signalA zipWith:signalA1];
    signalG = [RACSignal zip:@[signalA,signalA1]];
    signalG = [RACSignal zip:RACTuplePack(signalA,signalA1)];
    [signalA subscribeNext:^(id  _Nullable x) {
        NSLog(@"A = %@",x);
    } completed:^{

    }];
    [signalA1 subscribeNext:^(id  _Nullable x) {
        NSLog(@"A1 = %@",x);
    } completed:^{

    }];
    [signalG subscribeNext:^(id  _Nullable x) {
        NSLog(@"G = %@",x);
    } completed:^{

    }];
打印：
2018-11-13 17:07:01.322365+0800 TestReativeCocoa[24099:474095] A = 1
2018-11-13 17:07:01.322481+0800 TestReativeCocoa[24099:474095] A = 6
2018-11-13 17:07:01.322586+0800 TestReativeCocoa[24099:474095] A = 9
2018-11-13 17:07:01.322695+0800 TestReativeCocoa[24099:474095] A = 10
2018-11-13 17:07:01.322829+0800 TestReativeCocoa[24099:474095] A1 = 2
2018-11-13 17:07:01.322935+0800 TestReativeCocoa[24099:474095] A1 = 4
2018-11-13 17:07:01.323042+0800 TestReativeCocoa[24099:474095] A1 = 5
2018-11-13 17:07:01.323148+0800 TestReativeCocoa[24099:474095] A1 = 8
2018-11-13 17:07:01.323668+0800 TestReativeCocoa[24099:474095] G = <RACTuple: 0x6000024b0e20> (
    1,
    2
)
2018-11-13 17:07:01.323857+0800 TestReativeCocoa[24099:474095] G = <RACTuple: 0x6000024b0e40> (
    6,
    4
)
2018-11-13 17:07:01.325652+0800 TestReativeCocoa[24099:474095] G = <RACTuple: 0x6000024a7d70> (
    9,
    5
)
2018-11-13 17:07:01.325827+0800 TestReativeCocoa[24099:474095] G = <RACTuple: 0x6000024a7d90> (
    10,
    8
)

*组合操作 combineLatest

98667DEE-D809-4D70-A74F-C7BA6BC17A3A.png

• 组合操作 sample

  
  image.png

如果 signalA 是景物的话 signalB就是signal的快门

• 组合操作 takeUntil

    RACSignal *signalH = [signalA takeUntil:signalB];

• 组合操作 takeUntilReplacement

  
  image.png

高阶操作

• 升阶操作

map  产生信号

• 降阶操作 - switchToLatest

  RACSignal *signalH = [signalA switchToLatest];

image.png

*降阶操作 - if/then/else with/cases/default

image.png