ReactiveCocoa 基本使用回忆录

ReactiveCocoa 基本使用回忆录

RACSignal

//Signal 测试
-(void)testRacSignal{//1 创建信号-默认是冷信号RACSignal *signal = [RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) {//3 发送数据NSLog(@"信号被订阅");[subscriber sendNext:@100];return nil;}];//2.订阅信号[signal subscribeNext:^(id x) {NSLog(@"信号发送的内容1 %@",x);}];[signal subscribeNext:^(id x) {NSLog(@"信号发送的内容2 %@",x);}];}

//Signal 测试2
-(void)testRacSignal2{//1 创建信号-默认是冷信号RACSignal *signal = [RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) {//3 发送数据NSLog(@"信号被订阅");self.subscriber = subscriber;[subscriber sendNext:@100];return [RACDisposable disposableWithBlock:^{//只要信号取消订阅就会来这NSLog(@"信号订阅完成");}];}];//2.订阅信号RACDisposable *disposable = [signal subscribeNext:^(id x) {NSLog(@"信号发送的内容 %@",x);}];// 1.创建订阅者,保存nextBlock// 2.订阅信号// 默认一个信号发送数据完毕们就会主动取消订阅.// 只要订阅者在,就不会自动取消信号订阅// 取消订阅信号[disposable dispose]; }

RACSubject

信号提供者，自己可以充当信号，又能发送信号

-(void)RACSubject{//1.创建信号RACSubject *subject = [RACSubject subject];//2.订阅信号[subject subscribeNext:^(id x) {NSLog(@"接收到数据:%@",x);}];//3.发送数据[subject sendNext:@100];}

RACReplaySubject

RACReplaySubject:可以先发送信号,在订阅信号,RACSubject就不可以。

-(void)RACReplaySubject{RACReplaySubject *subject = [RACReplaySubject subject];[subject subscribeNext:^(id x) {NSLog(@"接收到数据:%@",x);}];[subject sendNext:@"LouKit"];}

RACMulticastConnection

用于当一个信号，被多次订阅时，为了保证创建信号时，避免多次调用创建信号中的block，造成副作用，可以使用这个类处理

-(void)RACMulticastConnection{// 1.创建信号// 2.把信号转换成连接类// 3.订阅连接类的信号// 4.连接RACSignal *signal = [RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) {NSLog(@"信号被订阅");[subscriber sendNext:@100];return nil;}];//把信号转换成链接类// 确定源信号的订阅者RACSubject// RACMulticastConnection *connection = [signal publish];RACMulticastConnection *connection = [signal multicast:[RACReplaySubject subject]];//订阅信号，也不能激活信号，只是保存订阅者到数组，必须通过连接,当调用连接，就会一次性调用所有订阅者的sendNext:[connection.signal subscribeNext:^(id x) {NSLog(@"订阅者1:%@",x);}];[connection.signal subscribeNext:^(id x) {NSLog(@"订阅者2:%@",x);}];// 4.连接,激活信号[connection connect];
}

RACCommand

RAC中用于处理事件的类，可以把事件如何处理,事件中的数据如何传递，包装到这个类中，可以很方便的监控事件的执行过程。

-(void)RACCommand{// RACCommand:处理事件// RACCommand:不能返回一个空的信号//1.创建命令RACCommand *command = [[RACCommand alloc]initWithSignalBlock:^RACSignal *(id input) {// input:执行命令传入参数// Block调用:执行命令的时候就会调用NSLog(@"input:%@",input);// return[RACSignal empty];return [RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) {[subscriber sendNext:@"执行命令产生的数据"];return nil;}];}];//2 执行命令RACSignal *signal = [command execute:@1];//3. 订阅信号[signal subscribeNext:^(id x) {NSLog(@"订阅到数据:%@",x);}];
}

-(void)RACCommand2{RACCommand *command = [[RACCommand alloc]initWithSignalBlock:^RACSignal *(id input) {return [RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) {[subscriber sendNext:@"data"];return nil;}];}];// 订阅信号// 注意:必须要在执行命令前,订阅//executionSignals:信号源,信号中信号,signalOfSignals:信号:发送数据就是信号
// [command.executionSignals subscribeNext:^(RACSignal *x) {
    
// [x subscribeNext:^(id x) {
    
// NSLog(@"收到的数据:%@",x);
// }];
// }];// switchToLatest获取最新发送的信号,只能用于信号中信号[command.executionSignals.switchToLatest subscribeNext:^(id x) {NSLog(@"收到的数据:%@",x);}];[command execute:@1];}

-(void)RACCommand3{// 当前命令内部发送数据完成,一定要主动发送完成// 1.创建命令RACCommand *command = [[RACCommand alloc]initWithSignalBlock:^RACSignal *(id input) {return [RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) {[subscriber sendNext:@"data"];[subscriber sendCompleted];return nil;}];}];[command.executing subscribeNext:^(id x) {if ([x boolValue]) {NSLog(@"当前正在执行");// 当前正在执行}else{// 执行完成/没有执行NSLog(@"执行完成/没有执行");}}];// 2.执行命令[command execute:@1];}

RACTuple、RACSequence

//RACTuple:元组类,类似NSArray,用来包装值.

//RACSequence:RAC中的集合类，用于代替NSArray,NSDictionary,可以使用它来快速遍历数组和字典。

-(void)RACTuple{NSArray *numbers = @[@1,@2,@3,@4];RACTuple *tuple = [RACTuple tupleWithObjectsFromArray:numbers];NSLog(@"tuple:%@",tuple[0]);[numbers.rac_sequence.signal subscribeNext:^(id x) {NSLog(@"%@",x);}];//字典NSDictionary *dict = @{@"key1":@"value1",@"key2":@"value2",@"key3":@100};[dict.rac_sequence.signal subscribeNext:^(RACTuple *tuple) {// NSString *key = tuple[0];// NSString *value = tuple[1];// RACTupleUnpack:用来解析元组// 宏里面的参数,传需要解析出来的变量名// = 右边,放需要解析的元组RACTupleUnpack(NSString *key,NSString *value) = tuple;NSLog(@"key:%@,vlaue:%@",key,value);}];}

bind

    [[_textfield.rac_textSignal bind:^RACStreamBindBlock{return ^RACStream*(id value, BOOL *stop){return [RACReturnSignal return:[NSString stringWithFormat:@"LK:%@",value]];};}]subscribeNext:^(id x) {self.lable.text = x;}];

flattenMap

//映射
-(void)flattenMap{//    flattenMap作用:把源信号的内容映射成一个新的信号，信号可以是任意类型。[[_textfield.rac_textSignal flattenMap:^RACStream *(id value) {return [RACReturnSignal return:[NSString stringWithFormat:@"LK:%@",value]];}]subscribeNext:^(id x) {self.lable.text = x;}];
}

map

/** FlatternMap和Map的区别 1.FlatternMap中的Block返回信号。 2.Map中的Block返回对象。 3.开发中，如果信号发出的值不是信号，映射一般使用Map 4.开发中，如果信号发出的值是信号，映射一般使用FlatternMap。**/
-(void)map{[[_textfield.rac_textSignal map:^id(id value) {return [NSString stringWithFormat:@"LL:%@",value];}]subscribeNext:^(id x) {self.lable.text = x;}];
}

signalOfsignals

-(void)signalOfsignals{RACSubject *signalOfsignals = [RACSubject subject];RACSubject *signal = [RACSubject subject];[[signalOfsignals flattenMap:^RACStream *(id value) {//当signalOfsignals的signals发出信号才会调用return value;}]subscribeNext:^(id x) {NSLog(@"signalOfsignals:%@",x);}];[signalOfsignals sendNext:signal];[signal sendNext:@1];
}

concat

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。

-(void)concat{//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 *signalA = [RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) {[subscriber sendNext:@"A100"];[subscriber sendCompleted];return nil;}];RACSignal *signalB = [RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) {[subscriber sendNext:@"B100"];[subscriber sendCompleted];return nil;}];// 把signalA拼接到signalB后，signalA发送完成，signalB才会被激活。RACSignal *signal = [signalA concat:signalB];//注意：第一个信号必须发送完成，第二个信号才会被激活[signal subscribeNext:^(id x) {NSLog(@"%@",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。
注意使用then，之前信号的值会被忽略掉.

-(void)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。//注意使用then，之前信号的值会被忽略掉.[[[RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) {[subscriber sendNext:@100];[subscriber sendCompleted];return nil;}]then:^RACSignal *{return [RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) {[subscriber sendNext:@200];[subscriber sendCompleted];return nil;}];}]subscribeNext:^(id x) {NSLog(@"%@",x);//200}];}

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.

-(void)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 *signalA = [RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) {[subscriber sendNext:@"A100"];[subscriber sendCompleted];return nil;}];RACSignal *signalB = [RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) {[subscriber sendNext:@"B100"];[subscriber sendCompleted];return nil;}];RACSignal *signal = [signalA merge:signalB];[signal subscribeNext:^(id x) {NSLog(@"%@",x);//200}];
}

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，才会触发压缩流的next事件

-(void)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，才会触发压缩流的next事件RACSignal *signalA = [RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) {[subscriber sendNext:@"A100"];[subscriber sendCompleted];return nil;}];RACSignal *signalB = [RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) {[subscriber sendNext:@"B100"];[subscriber sendCompleted];return nil;}];RACSignal *siganl = [signalA zipWith:signalB];[siganl subscribeNext:^(id x) {NSLog(@"%@",x);//包装成元组发出/**<RACTuple: 0x608000019fb0> (A100,B100)**/}];
}

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，才会触发合并的信号。

-(void)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，才会触发合并的信号。RACSignal *signalA = [RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) {[subscriber sendNext:@"A100"];[subscriber sendCompleted];return nil;}];RACSignal *signalB = [RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) {[subscriber sendNext:@"B100"];[subscriber sendCompleted];return nil;}];//把两个信号组合成一个信号,跟zip一样，没什么区别RACSignal *siganl = [signalA combineLatestWith:signalB];[siganl subscribeNext:^(id x) {NSLog(@"%@",x);//包装成元组发出/**<RACTuple: 0x608000019fb0> (A100,B100)**/}];
}

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

-(void)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RACSignal *signalA = [RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) {[subscriber sendNext:@"A100"];[subscriber sendCompleted];return nil;}];RACSignal *signalB = [RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) {[subscriber sendNext:@"B100"];[subscriber sendCompleted];return nil;}];// 常见的用法，（先组合在聚合）。combineLatest:(id<NSFastEnumeration>)signals reduce:(id (^)())reduceBlock// reduce中的block简介:// 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// reduceblcok的返回值：聚合信号之后的内容。RACSignal *reduceSignal = [RACSignal combineLatest:@[signalA,signalB] reduce:^id(NSNumber *num1 ,NSNumber *num2){return [NSString stringWithFormat:@"%@ %@",num1,num2];}];[reduceSignal subscribeNext:^(id x) {NSLog(@"%@",x);}];}

待续…..