RAC集合类:

1. RACTuple:元组,类似NSArray,用来包装值
2. RACSequence:RAC中集合,用于替代NSArray,NSDictionary可以使用它快速遍历.

    NSArray *arr = @[@"12",@"2121",@1];
    NSDictionary *dic = @{@"name":@"zhangsan",@"age":@"15",@"height":@"165"};
    
    RACTuple *tuple = [RACTuple tupleWithObjectsFromArray:arr];
    NSLog(@"%@",tuple[0]);
    
    //将集合转化为RACSequence集合
    RACSequence *sequence = arr.rac_sequence;
    RACSignal *singal = sequence.signal;
    [singal subscribeNext:^(id x) {
        NSLog(@"%@",x);
    }];
    //数组遍历.
    [arr.rac_sequence.signal subscribeNext:^(id x) {
        NSLog(@"常用写法%@",x);
    }];
    //字典遍历RACTuple元组包装相应key:value
    [dic.rac_sequence.signal subscribeNext:^(id x) {
        NSLog(@"%@",x);
    }];

RAC开发中常见用法:

• 1. 代替代理
• 2. kvo
• 3. 通知
• 4. 监听事件
• 5. 文本框改变

代码实现

//监听某个某个对象的方法是否调用:代理的rac另外一种实现
    [[self.reaVIew rac_signalForSelector:@selector(didClickAction:)] subscribeNext:^(id x) {
        NSLog(@"点击按钮,但无法传值,x:%@",x);
        /*
         点击按钮,但无法传值,x:<RACTuple: 0x60000039cea0> (
             "<UIButton: 0x7fc888c13890; frame = (97 63; 46 30); opaque = NO; autoresize = RM+BM; layer = <CALayer: 0x600000197e20>>"
         )
         */
    }];
    
    //替代kvo,需要手动导入另外的头文件默认没导入
    [self.reaVIew rac_observeKeyPath:@"frame" options:NSKeyValueObservingOptionNew observer:nil block:^(id value, NSDictionary *change, BOOL causedByDealloc, BOOL affectedOnlyLastComponent) {
        NSLog(@"frame属性发生改变");
    }];
    [[self.view rac_valuesForKeyPath:@"frame" observer:nil]subscribeNext:^(id x) {
       NSLog(@"frame属性发生改变%@",x);
    }];
    
    //监听事件
    UIButton *btn = [[UIButton alloc]init];
    [[btn rac_signalForControlEvents:UIControlEventTouchUpInside]subscribeNext:^(id x) {
        NSLog(@"按钮点击了");
    }];
    
    [[[NSNotificationCenter defaultCenter]rac_addObserverForName:UIKeyboardWillShowNotification object:nil]subscribeNext:^(id x) {
        NSLog(@"通知");
    }];
    
    //监听文本框
    UITextField *textField = [[UITextField alloc]init];
    [[textField rac_textSignal]subscribeNext:^(id x) {
        NSLog(@"文本框改变");
    }];