Recently I’ve been working on some iOS 8 app extensions, and I’ve run into a few non-obvious details that might come in handy for anyone else in the same situation. Some of the following relates to bugs still in the system, and so will probably only be relevant for a limited time.
Debugging: General The intended approach is simple: when you tell Xcode to run the extension, Xcode will ask you what host app you want to use.