objective-c – “结合最新”与ReactiveCocoa和信号信号

给定N个文本字段,订阅UIControlEditingEventChanged事件,并根据被调用的值创建新信号.每个订户完成一次订阅,然后将这些值相互结合使用.所以这就是我所拥有的：

__block NSMutableSet *subscriptions = [NSMutableSet set];
RACSignal *validationSignals = [[[[TEXT_FIELDS rac_sequence].signal flattenMap:^RACStream* (UITextField *textField) {
    return [textField rac_signalForControlEvents:UIControlEventEditingChanged];
}] flattenMap:^RACStream *(UITextField* textField) {
    if(![subscriptions containsObject:textField]) {
         [subscriptions addObject:textField];
        return [textField rac_validationSignal];
    }
    return [RACSignal empty];
}]];

其中rac_validationSignal是我自己的类处理UITextFields的验证.信号正确通过,但一次只能通过一个.我需要一次性获取所有订阅的值,以获得所有已编辑字段的有效性.

编辑：

一种可能的解决方案涉及一个可变数组,我将新字段添加到并按正常情况发送组合信号.这似乎相当不错,还有其他想法吗？

__block NSMutableSet *subscriptions = [NSMutableSet set];
__block NSMutableArray *signals = [NSMutableArray array];
RAC(self.editButton,enabled) =
[[[[TEXT_FIELDS rac_sequence].signal flattenMap:^RACStream* (UITextField *textField) {
    return [textField rac_signalForControlEvents:UIControlEventEditingChanged];
}] flattenMap:^RACStream *(UITextField* textField) {
    if(![subscriptions containsObject:textField]) {
        [subscriptions addObject:textField];
        [signals addObject:[textField rac_validationSignal]];
        return [RACSignal combineLatest:signals];
    }
    return [RACSignal empty];
}] map:^NSNumber *(RACTuple *value) {
    for(NSNumber *isValid in value) {
        if(![isValid boolValue]) { return @(NO); }
    }
return @(YES);
}];

谢谢！