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RVXSelectorBinding *_binding;

// ThemeManager.sharedManager.theme が変更されたら updateWithTheme: が呼ばれる
_binding = [RVXSelectorBinding.alloc initWithObject:[ThemeManager sharedManager] keyPath:@"theme" target:self selector:@selector(updateWithTheme:)];

// updateWithTheme: を呼ぶ
[_binding notify];

- (void)updateWithTheme:(RVXTheme *)theme {
  // ...
}

RVXBiding *binding = ...;
RVXNotifier *notifier = [binding notifierWithBlock:^(...) {
  // ...
}];

// 自動で notifier.delegate に self が設定される
[self.rvx_notifiers addObject[RVXBlockNotifier ...]];