CKComponentViewAttributeValue CKComponentDelegateAttribute()

in ComponentKit/Core/Action/CKComponentDelegateAttribute.mm [21:70]

• 39 lines of code
• 2 McCabe index (conditional complexity)

CKComponentViewAttributeValue CKComponentDelegateAttribute(SEL selector,
                                                           CKComponentForwardedSelectors selectors) noexcept
{
  if (selector == NULL) {
    return {
      {
        std::string("Delegate-noop-") + sel_getName(selector) + "-",
        ^(UIView *view, id value) {}, ^(UIView *view, id value) {}
      },
      @YES  // Bogus value, we don't use it.
    };
  }

  return {
    {
      std::string(sel_getName(selector)) + CKIdentifierFromDelegateForwarderSelectors(selectors),
      ^(UIView *view, id value){

        // Create a proxy for this set of selectors

        RCCAssertNil(CKDelegateProxyForObject(view),
                     @"Unsupported: registered two delegate proxies for the same view: %@ %@", view, CKDelegateProxyForObject(view));

        CKComponentDelegateForwarder *proxy = [CKComponentDelegateForwarder newWithSelectors:selectors];
        proxy.view = view;
        CKSetDelegateProxyForObject(view, proxy);

#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Warc-performSelector-leaks"
        [view performSelector:selector withObject:proxy];
#pragma clang diagnostic pop

      },
      ^(UIView *view, id value){

        // When unapplied, remove association with the view
        CKComponentDelegateForwarder *proxy = CKDelegateProxyForObject(view);
        proxy.view = nil;
        CKSetDelegateProxyForObject(view, nil);

#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Warc-performSelector-leaks"
        [view performSelector:selector withObject:nil];
#pragma clang diagnostic pop

      }
    },
    @YES // Bogus value, we don't use it.
  };
}