I have a picture sharing app which shares pictures among your app friends. My requirement is to show my app in sharing via pop-up, when iOS user choose any photo from photo gallery.
I found solutions for sharing PDF files via custom app, but no luck for iOS "photos".
I have also go through this link https://stackoverflow.com/questions/9266079/why-is-my-iOS-app-not-showing-up-in-other-apps-open-in-dialog and did changes in my app, but it seems not to be working.
I use "Share Extension" to add my own app in the share list. You have to create a new target of your app
Be careful!! The Deployment Target version of this target should under the version of your testing device to make sure the icon shows in the list.
Other activities should be defined in the ShareViewController.m created automatically.
Hope my answer can help you :)