Ios ReactiveCocoa takeUntil:donds'；不发送完成？

我在做一些基本的信号链接。按下按钮后，我想等待

loginSignal

完成一些操作。信号完成，但未调用my

subscribeCompleted:

块

直接订阅

next

和

loginSignal

上的

completion

，按预期工作。那么为什么

takeUntil:subscribebcompleted:

不起作用呢

[[[button rac_signalForControlEvents:UIControlEventTouchUpInside] takeUntil:loginSignal] subscribeCompleted:^{
    NSLog(@"COMPLETE");
    // Do some other stuff
}];

编辑：以下是

logAll

2014-08-15 10:52:56.417 app[88791:60b] <RACDynamicSignal: 0x10c58a120> name:  next: <UIButton: 0x10c68a870; frame = (240 80; 40 40); opaque = NO; autoresize = TM+BM; autoresizesSubviews = NO; tag = 1103; layer = <CALayer: 0x10c6894a0>>
2014-08-15 10:52:56.417 app[88791:60b] <RACDynamicSignal: 0x10c58a120> name:  next: <UIButton: 0x10c68a870; frame = (240 80; 40 40); opaque = NO; autoresize = TM+BM; autoresizesSubviews = NO; tag = 1103; layer = <CALayer: 0x10c6894a0>>
2014-08-15 10:53:02.086 app[88791:410b] <RACDynamicSignal: 0x112e2c4b0> name:  next: 1
2014-08-15 10:53:02.087 app[88791:410b] <RACDynamicSignal: 0x10c6ea5d0> name:  next: 1
2014-08-15 10:53:02.087 app[88791:410b] <RACDynamicSignal: 0x10c6ea5d0> name:  next: 1
2014-08-15 10:53:02.088 app[88791:410b] <RACDynamicSignal: 0x10c6b8830> name:  next: 1
2014-08-15 10:53:02.089 app[88791:410b] <RACDynamicSignal: 0x10c6b8830> name:  next: 1
2014-08-15 10:53:02.089 app[88791:410b] <RACDynamicSignal: 0x10c52e570> name:  next: 1
2014-08-15 10:53:02.090 app[88791:410b] <RACDynamicSignal: 0x10c52e570> name:  next: 1

---

事实证明，

takeUntil:

不是获得这种行为的正确方法。启动

loginSignal

后，它会导致

sendCompleted:

多次启动（因此看起来没有启动？），即使是对于未点击的按钮也是如此。更好的方法是

flattmap:

并发送

loginSignal

正确版本：

[[[[[button rac_signalForControlEvents:UIControlEventTouchUpInside] flattenMap:^RACStream *(id value) {
    return loginSignal;
}] take:1] subscribeNext:^(id value){
    // DO STUFF!!!
}];

---

loginSignal

是如何定义的？添加了该信息。LOGGEDIN为1，仅供参考。

[[[[[button rac_signalForControlEvents:UIControlEventTouchUpInside] flattenMap:^RACStream *(id value) {
    return loginSignal;
}] take:1] subscribeNext:^(id value){
    // DO STUFF!!!
}];