ReactiveCocoa分析

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1.RACSubject
id subscriber:一个RACSubscriber对象并且实现RACSubscriber协议

    //先订阅 后发送信号源
    RACSubject * subject=[RACSubject subject];
    [subject subscribeNext:^(id x) { //创建第一个订阅者
        NSLog(@"x1:%@",x);
        NSLog(@"");
    }];
    [subject subscribeNext:^(id x) {//创建第二个订阅者  保存subscribers数组
        NSLog(@"x2:%@",x);
        NSLog(@"");
    }];
    [subject sendNext:@1];    //遍历订阅者subscribers  同时发送消息

延迟
RACDelaySubject

   //先发送 后订阅
    RACReplaySubject * subject=[RACReplaySubject subject];
    [subject sendNext:@1];           //发送消息  for循环遍历 这个时候发现没有订阅者 根本无法调用block
    [subject subscribeNext:^(id x) { //创建内部订阅者  RACReplaySubject 实现父类方法  并且 遍历valuesReceived 调用sendNextBlock
        NSLog(@"x1:%@",x);
        NSLog(@"");
    }];

2.Rac集合rac_sequence
开启异步线程遍历。

    NSArray  *data=@[@1,@2,@3,@4,@5,@6,@7,@8];
    [data.rac_sequence.signal subscribeNext:^(id x) {
        NSLog(@"%@",x);
        NSLog(@"开启一个新的线程");
    } completed:^{
        NSLog(@"刷新ui");
    }];

    NSDictionary *dic = @{@"name":@"xiaohua",@"xingbie":@"woman"};
    [dic.rac_sequence.signal subscribeNext:^(RACTuple * x)
    {
        NSString *key=x[0];
        NSString *value=x[1];
        RACTupleUnpack(NSString *key2,NSString *value2) = x;//元组
   NSLog(@"key1:%@,value1%@;key2:%@,value:2%@",key,value,key2,value2);
    }];

    RACTuple * x =RACTuplePack(@1,@2,@3);
    ```

3.RACMulticastConnection组播

RACSignal * signal= [RACSignal createSignal:^RACDisposable * _Nullable(id _Nonnull subscriber) {
NSLog(@"Send Request");
[subscriber sendNext:@1];
return nil;
}];

/*执行1次Send Request*/
RACMulticastConnection *conn=[signal publish];

[conn.signal subscribeNext:^(id x) {
    NSLog(@"conn1:%@",x);
    NSLog(@"");
}];
[conn.signal subscribeNext:^(id x) {//创建第二个订阅者  保存subscribers数组
    NSLog(@"conn2:%@",x);
    NSLog(@"");
}];


[conn connect];

/*执行两次Send Request*/
[signal subscribeNext:^(id x) { //创建第一个订阅者
    NSLog(@"x1:%@",x);
    NSLog(@"");
}];
[signal subscribeNext:^(id x) {//创建第二个订阅者  保存subscribers数组
    NSLog(@"x2:%@",x);
    NSLog(@"");
}];

4.RacCommond
4.1

-(void)doCommond
{
//监听按钮网络请求
RACCommand * command = [[RACCommand alloc] initWithSignalBlock:^RACSignal *(id input)
{
//command block
NSLog(@"开始RACCommand_block:%@",input);
NSLog(@"");
//必须返回一个信号 [RACSignal empty]; 返回nil 会崩溃
return [RACSignal createSignal:^RACDisposable *(id subscriber) {
//信号block 内部被订阅
NSLog(@"开始RACSignal_block");
[subscriber sendNext:@"RACSignalSendNext"];
[subscriber sendCompleted];//判断是否完成会用到的
return nil;
}];
}];
//订阅到内部信号
//方式1:信号中的信号一开始获取不到内部信号
[command.executionSignals subscribeNext:^(id x) {

    NSLog(@"subcrible:%@",x);
    NSLog(@"");
    [x  subscribeNext:^(id x) {

        NSLog(@"next subcrible:%@",x);
        NSLog(@"");
    }];
}];
//方式2:execute获取内部信号
[[command execute:@"1"] subscribeNext:^(id x) {
    NSLog(@"subcrible:%@",x);
    NSLog(@"");
}];

//方式3:switchToLatest获取最近发送的信号
[command.executionSignals.switchToLatest subscribeNext:^(id x) {
    
    NSLog(@"executionSignals.switchToLatest:%@",x);
    NSLog(@"");
    
}];
//监听命令是否完成  第一次不准确
[command.executing subscribeNext:^(id x) {
    BOOL isExecuting  = [x boolValue];
    if(isExecuting)
    {
        NSLog(@"正在执行");
    }else
    {
        NSLog(@"完成执行");
    }
}];

//监听命令是否完成   上面第一次不准 需要跳过第一次
[[command.executing skip:1] subscribeNext:^(id x) {
    BOOL isExecuting  = [x boolValue];
    if(isExecuting)
    {
        NSLog(@"正在执行");
    }else
    {
        NSLog(@"完成执行");//需要信号发送sendCompleted
    }
}];


[command execute:@"commond"];

}

5.doSingalForSelector

-(void)doSingalForSelector
{
UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];

[self.view addSubview:btn];

[btn mas_makeConstraints:^(MASConstraintMaker *make) {
    make.left.top.mas_equalTo(200);
    make.width.height.mas_equalTo(100);
}];
btn.backgroundColor = [UIColor greenColor];

//按钮点击事件
[[btn rac_signalForControlEvents:UIControlEventTouchUpInside] subscribeNext:^(id x) {
NSLog(@"btn %@",x);
NSLog(@"");
self.count++;
}];
}


6.KVO

-(void)doSingalForKVO
{
//@"count" == keypath(self,count)
//方式1
[[self rac_valuesAndChangesForKeyPath:@keypath(self,count) options:NSKeyValueObservingOptionNew observer:self] subscribeNext:^(id x) {
RACTupleUnpack(NSNumber *value,NSDictionary *dic) =x;

    NSLog(@"value:%@,dic:%@",value,dic);
    NSLog(@"kvo:%@",x);

}];
//方式2
[RACObserve(self, count) subscribeNext:^(id x)
 {
    NSLog(@"kvo:%@",x);
}];

// [self removeObserver:self forKeyPath:NSStringFromSelector(@selector(count))];
}

7.doSingalForNotification

-(void)doSingalForNotification
{
[[[NSNotificationCenter defaultCenter] rac_addObserverForName:@"notify" object:nil] subscribeNext:^(id x) {
NSLog(@"x::%@",x);
}];

[[NSNotificationCenter defaultCenter] postNotificationName:@"notify" object:nil];

}

8.监听

-(void)doMonitor
{
UITextField *tf = [[UITextField alloc] init];
UILabel *label = [[UILabel alloc] init];

[self.view addSubview:tf];
[self.view addSubview:label];

[tf mas_makeConstraints:^(MASConstraintMaker *make) {
    make.left.top.mas_equalTo(200);
    make.width.height.mas_equalTo(100);
}];

[label mas_makeConstraints:^(MASConstraintMaker *make) {
    make.top.mas_equalTo(200);
    make.left.mas_equalTo(320);
    make.width.height.mas_equalTo(100);
}];


tf.backgroundColor = [UIColor greenColor];

方式1:信号订阅
[tf.rac_textSignal subscribeNext:^(id x) {

    NSLog(@"x:%@",x);
    label.text =x;
}];
//方式2:事件绑定机制
RAC(label,text)=tf.rac_textSignal;

}


9.doLiftSignal

//处理一个界面多个请求
-(void)doLiftSignal
{

RACSignal *homeSignal=[ RACSignal createSignal:^RACDisposable *(id subscriber) {
    
    dispatch_after(dispatch_time(DISPATCH_TIME_NOW,  5 * NSEC_PER_SEC), dispatch_get_main_queue(), ^(void){
        NSLog(@"loadHome");
        [subscriber sendNext:@"loadHome"];
    });
    
    return nil;
}];


RACSignal *bannerSignal=[ RACSignal createSignal:^RACDisposable *(id subscriber) {
    
    dispatch_after(dispatch_time(DISPATCH_TIME_NOW,  1 * NSEC_PER_SEC), dispatch_get_main_queue(), ^(void){
        NSLog(@"loadBanner");
        [subscriber sendNext:@"loadBanner"];
    });
    
    return nil;
}];


[self rac_liftSelector:@selector(updateUI:banner:) withSignalsFromArray:@[homeSignal,bannerSignal]];

}

-(void)updateUI:(RACSignal *)homeSignal banner:(RACSignal *)bannerSignal
{
NSLog(@"updateUI");
}


10.doMap

/*
map方法，根据原信号创建了一个新的信号，并且变换了信号的输出值。这两个信号具有明显的先后顺序关系。而flattenMap方法，直接生成了一个新的信号，这两个信号并没有先后顺序关系，属于同层次的平行关系
*/
-(void)doSignalMap
{
UITextField *tf = [[UITextField alloc] init];
[self.view addSubview:tf];
[tf mas_makeConstraints:^(MASConstraintMaker *make) {
make.left.top.mas_equalTo(200);
make.width.mas_equalTo(140);
make.height.mas_equalTo(40);
}];

tf.backgroundColor = [UIColor greenColor];

// //方式1:flattenMap信号中的信号
// [[tf.rac_textSignal flattenMap:^RACStream *(id value) {
//
// NSLog(@"flattenMap:%@",value);
// NSString *result= [NSString stringWithFormat:@"result_%@",value];
// return [RACReturnSignal return:result];
//
// }] subscribeNext:^(id x) {
//
// NSLog(@"flattenMap--:%@",x);
// }];

//方式2:map 值
[[tf.rac_textSignal map:^id(id value) {
    
    NSString *result= [NSString stringWithFormat:@"result_%@",value];
    
    return result;
    
}] subscribeNext:^(id x) {
    
    NSLog(@"map--:%@",x);
}];

}

11.

ReactiveCocoa分析

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