我正在做一些基本的信号链。按下按钮后,我想等到 loginSignal
完成才能做一些事情。信号完成,但我的 subscribeCompleted:
block 没有被调用。
在 loginSignal
上直接订阅 next
和 completion
会按预期工作。那么,为什么 takeUntil: subscribeCompleted:
不起作用?
[[[button rac_signalForControlEvents:UIControlEventTouchUpInside] takeUntil:loginSignal] subscribeCompleted:^{
NSLog(@"COMPLETE");
// Do some other stuff
}];
编辑:这是 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
编辑 2:这是 loginSignal
RACSignal* loginSignal = [[[RACObserve(obj, loginState) distinctUntilChanged] filter:^BOOL(id value) {
return ([value integerValue] == LOGGEDIN);
}] takeUntil:[self rac_prepareForReuseSignal]];
最佳答案
事实证明,takeUntil:
并不是获得此行为的正确方法。 loginSignal
触发后,它会导致 sendCompleted:
触发多次(因此看起来没有触发?),即使对于尚未点击的按钮也是如此。更好的方法是 flattenMap:
并发送 loginSignal
。
正确的版本:
[[[[[button rac_signalForControlEvents:UIControlEventTouchUpInside] flattenMap:^RACStream *(id value) {
return loginSignal;
}] take:1] subscribeNext:^(id value){
// DO STUFF!!!
}];
关于ios - ReactiveCocoa takeUntil : doesn't send completion?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/25330320/