CODEWITHSUNDEEP
iosobjective-creactive-cocoa
tagirkaZ
tagirkaZ

Reputation: 469

RACObserve subscribeNext get called instantly

I'm using ReactiveCocoa 2.5 because I need to support iOS 7. I'm new at ReactiveCocoa. I've write this code:

__weak typeof(self) weakSelf = self;
[RACObserve(_currentUser, username) subscribeNext:^(NSString *newUsername) {
    [weakSelf performSelector:@selector(saveUserChanges) withObject:nil afterDelay:.1];
}];

And subscribeNext block get called instantly. _currentUser's username property not changed after I call RACObserve subscribeNext. Maybe it's normal behaviour and subscribeNext should get called first time after starting to observe? If it's normal how can I avoid this?

Upvotes: 0

Views: 810

Answers (1)

Ian Henry
Ian Henry

Reputation: 22433

Yes, this is normal -- signals created via RACObserve will always send their initial values immediately. If you only want subsequent values, you can skip the initial value like so:

[[RACObserve(_currentUser, username) skip:1] subscribeNext:^(NSString *newUserName) {
    [weakSelf performSelector:@selector(saveUserChanges) withObject:nil afterDelay:.1];
}];

Upvotes: 4

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