Add “Edit in Excel” or “Edit photo” extension
问题 I checked the latest Dropbox and Excel for iOS. In Dropbox we get an edit button. On click it opens Excel\'s extension where you can edit the file. After save, changes are reflected in the Dropbox file too. I want to add such a button. Also I\'d like to add such a button to images to open them in available \"photo editing\" apps. How to check if file (image, xls, doc or any other) can be opened to edit? Code so far: UIDocumentPickerViewController *documentPicker = [