圖解 ReactiveCocoa 基本函式

2016-10-10 | 稻子| iOS

標籤（空格分隔）： RAC FRP 函數語言程式設計 響應式程式設計

本文內容僅適用於ReactiveCocoa v2.5

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關於函式響應式程式設計（FRP），可以參考

• What is (functional) reactive programming?
• Specification for a Functional Reactive Programming language

Streams of values over time

ReactiveCocoa repo上最簡單的一句話對FRP做了本質的描述，而repo本身提供的是APIs of composing and transforming streams of values，而Streams of values的抽象在ReactiveCocoa中應該是RACStream，而composing and transforming是本文的重點。

先解釋ReactiveCocoa中的兩個基本概念

• 訊號（Signal） a signal is a steam of values，signals can be transformed, combined,etc.

• 訂閱者（Subscriber） a subscriber subscribes to a signal. RAC lets blocks,objects, and properties subscribe to signals

filter

RACSignal *signal = [@[ @1, @2, @3 ] rac_sequence].signal; signal = [signal filter:^BOOL(NSNumber *value) {
    return value.integerValue % 2;
}];
[signal subscribeNext:^(NSNumber *value) {
    NSLog(@"%@", value);
}];
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map

  RACSignal *signal = [@[ @1, @2, @3 ] rac_sequence].signal;
  signal = [signal map:^id(NSNumber *value) {
    return @(value.integerValue * 2);
  }];
  [signal subscribeNext:^(NSNumber *value) {
    NSLog(@"%@", value);
  }];
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merge

RACSignal *signal1 = [@[ @1, @2 ] rac_sequence].signal;
RACSignal *signal2 = [@[ @4, @5 ] rac_sequence].signal;

[[signal1 merge:signal2] subscribeNext:^(NSNumber *value) {
    NSLog(@"%@", value);
}];
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combineLatest

  RACSignal *signal1 = [@[ @1, @2 ] rac_sequence].signal;
  RACSignal *signal2 = [@[ @3, @4 ] rac_sequence].signal;

  [[signal1 combineLatestWith:signal2] subscribeNext:^(RACTuple *value) {
    NSLog(@"%@", value);
  }];
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combineLatest & reduce

  RACSignal *signal1 = [@[ @1, @2 ] rac_sequence].signal;
  RACSignal *signal2 = [@[ @3, @4 ] rac_sequence].signal;

  [[[signal1 combineLatestWith:signal2]
      reduceEach:^id(NSNumber *v1, NSNumber *v2) {
        return @(v1.integerValue * v2.integerValue);
      }] subscribeNext:^(RACTuple *value) {
    NSLog(@"%@", value);
  }];
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flatten

RACSignal *signal1 = [@[ @1, @2 ] rac_sequence].signal;
RACSignal *signal2 = [RACSignal return:signal1];

[[signal2 flatten] subscribeNext:^(NSNumber *value) {
    NSLog(@"%@", value);
}];
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flattenMap

RACSignal *signal = [@[ @1, @2 ] rac_sequence].signal;

[[signal flattenMap:^RACStream *(NSNumber *value) {
    return [RACSignal return:@(value.integerValue * 2)];
}] subscribeNext:^(NSNumber *value) {
    NSLog(@"%@", value);
}];
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not replay

RACSubject *letters = [RACSubject subject];
RACSignal *signal = letters;
[signal subscribeNext:^(id x) {
    NSLog(@"S1: %@", x);
}];
[letters sendNext:@"A"];
[signal subscribeNext:^(id x) {
    NSLog(@"S2: %@", x);
}];
[letters sendNext:@"B"];
[letters sendNext:@"C"];
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replay

RACSubject *letters = [RACReplaySubject subject];
RACSignal *signal = letters;
[signal subscribeNext:^(id x) {
  NSLog(@"S1: %@", x);
}];
[letters sendNext:@"A"];
[signal subscribeNext:^(id x) {
  NSLog(@"S2: %@", x);
}];
[letters sendNext:@"B"];
[signal subscribeNext:^(id x) {
  NSLog(@"S3: %@", x);
}];
[letters sendNext:@"C"];
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replayLast

RACSubject *letters = [RACSubject subject];
RACSignal *signal = [letters replayLast];
[signal subscribeNext:^(id x) {
  NSLog(@"S1: %@", x);
}];
[letters sendNext:@"A"];
[signal subscribeNext:^(id x) {
  NSLog(@"S2: %@", x);
}];
[letters sendNext:@"B"];
[signal subscribeNext:^(id x) {
  NSLog(@"S3: %@", x);
}];
[letters sendNext:@"C"];
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replayLazily

RACSubject *letters = [RACSubject subject];
RACSignal *signal = [letters replayLazily];
[letters sendNext:@"A"];
[signal subscribeNext:^(id x) {
  NSLog(@"S1: %@", x);
}];
[letters sendNext:@"B"];
[signal subscribeNext:^(id x) {
  NSLog(@"S2: %@", x);
}];
[letters sendNext:@"C"];
[signal subscribeNext:^(id x) {
  NSLog(@"S3: %@", x);
}];
[letters sendNext:@"D"];
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zip

RACSubject *letters = [RACSubject subject];
RACSubject *numbers = [RACSubject subject];

RACSignal *combined =
    [RACSignal zip:@[ letters, numbers ]
            reduce:^(NSString *letter, NSString *number) {
              return [letter stringByAppendingString:number];
            }];

// Outputs: A1 B2 C3
[combined subscribeNext:^(id x) {
  NSLog(@"%@", x);
}];

[letters sendNext:@"A"];
[letters sendNext:@"B"];
[letters sendNext:@"C"];
[numbers sendNext:@"1"];
[numbers sendNext:@"2"];
[numbers sendNext:@"3"];
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完整的原始碼可以在這裡找到 Demo

"-g"選項 : 檢視日誌緩衝區資訊;

"-b"選項 : 載入一個日誌緩衝區, 預設是 main, 下面詳解;

"-B"選項 : 以二進位制形式輸出日誌;
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