Reactive textfield signal doesn't fire on delete

Question

I have a UITextField and try to react to textField.text changes:

self.textField.delegate = self;
[self.textField.rac_textSignal map:^id(NSString *text) {
     return @(YES); // breakpoint here
}];

I'm running through the tutorial to learn ROC. I've noticed, that the block is being called when I type new character, but not when I delete old character. How to fix it..? I want the action to be called when I delete previous character.

---

Eg: on the left what is inside textField.text, on right - what's happening:

• a - hits breakpoint
• ab - hits breakpoint
• abc - hits breakpoint
• ab - nothing happens

---

Disclaimer: As I'm just learning this framework and don't want to make first steps on different version, i'm using same version of ROC as in the tutorial:

pod 'ReactiveCocoa', '2.1.8'

Answer 1

You can check out that this code works well instead of yours.

[self.usernameTextField.rac_textSignal subscribeNext:^(id x) {
  NSLog(@"%@", x);
}];

The difference is that my code have an subscribeNext: method call. Basic concept here is that you need subscription to execute you code. map: is the operator that changes input data only when data arrived. subscribeNext: / subscribeCompleted: / subscribeError: are the root cause of the forcing signals to send data to the chain in the ReactiveCocoa.

Probably you should read the official framework overview from the ReactiveCocoa team.

UPDATE:

For the current situation applying subscribeNext to the end will fix issue:

[[self.usernameTextField.rac_textSignal 
   map:^id(id x) { 
     NSLog(@"%@", x);
     return x;
}] 
   subscribeNext:^(id x) { 
     NSLog(@"%@", x); 
}];