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21 Mar 2016 Most of these changes can occur at runtime, and they require a dynamic response from your app. Others, like support for different screen sizes, 19 Oct 2017 App extensions in the Today view are called widgets. Widgets give users quick access to information that's important right now. For example Minor Change. QuickTime Media Types and Media Handlers Guide Swift app crashes when trying to reference Swift library libswiftCore.dylib. iOS, Technical 19 Oct 2017 An app extension lets you extend custom functionality and content beyond your app and make it available to users while they're interacting with Background App Refresh lets your app run periodically in the background so that it can update its content. Apps that update their content frequently, such as