reactive cocoa note

ios

Observe textField.text changing

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//only RACObserve(self.textField, text) or self.textField.rac_textSignal will not working
   RACSignal *textFieldTextSignal = [RACSignal merge:@[RACObserve(self.textField, text),self.textField.rac_textSignal]];
   
   [textFieldTextSignal subscribeNext:block];

Combine two signals

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void(^block)(RACTuple *) = ^(RACTuple *tuple) {
	NSString *x = tuple.first;
       NSString *y = tuple.second;
       //do something
   };
[[RACSignal combineLatest:@[signal1,signal2]] subscribeNext:block];