This will allow access to a shared container between the extension and container app. In order for an extension to share data with its container app, you need to configure an App Group. You need a developer account to enable App Groups. First, you’ll need a Client ID from Imgur to use their API and second, you’ll need to set up an App Group. There are a couple things you need to do to get it running. With the app overview out of the way, we can now set it up. To make things simple we’ll use Imgur for this as it allows users to upload images anonymously (without the images being linked to an account). We are going to build a Share extension that shares photos to a social networking site.
Any custom application that presents an instance of the UIActivityViewController class will be able to see your sharing extension if you built your extension so that it can handle the file type provided by that application. This isn’t limited to system applications. With share extensions, users will now be able to share content to your service direct from within the app they are using, be it Safari, Photos or other apps. Previously, sharing content usually entailed switching from one app to another, for example, while surfing in Safari, if you wanted to share a URL, you would copy it, switch to the app you wanted to save or share it in, perform the action and then resume surfing in Safari. Share extensions, introduced in iOS 8, give users an easy and convenient way to share content with other entities, such as social sharing websites or upload services. IOS Building a Simple Share Extension in iOS 8 App
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