objective c - How can I guarantee order of subscriber messages in ReactiveCocoa? -


i want various tasks when self.personsarray updated follows:

- (void)viewdidappear:(bool)animated {     @weakify(self)      [racobserve(self, personsarray) subscribenext:^(nsarray *personsarray) {         @strongify(self)          // update set of views          [self.view setneedsupdateconstraints];         [self.view setneedslayout];     }];      [racobserve(self, personsarray) subscribenext:^(nsarray *personsarray) {         @strongify(self)          // update second set of views          [self.view setneedsupdateconstraints];         [self.view setneedslayout];     }];      [racobserve(self, personsarray) subscribenext:^(nsarray *personsarray) {         @strongify(self)          [uiview animatewithduration:0.4 animations:^{             [self.view layoutifneeded];         }];     }]; }

i prefer separating work in distinct blocks because provides logical separation. i'd guarantee the last subscription message (the message executes animation block) sent last. how can this?

it seems me i'm looking might chaining (rather multiple independent sets of signals subscriptions, i've done in example), can't quite connect dots.

why don't update different parts this:

- (void)viewdidappear:(bool)animated {     @weakify(self)      [racobserve(self, personsarray) subscribenext:^(nsarray *personsarray) {         @strongify(self)          // update set of views         [self updatefirstsetofview];         [self updatesecondsetofview];         [self dosomethingelse];          //         [uiview animatewithduration:0.4 animations:^{             [self.view layoutifneeded];         }];      }]; }

you achieve same -donext: if prefer chaining.


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