How to create a custom UTType and make it enable for UIDocumentPickerViewController?

Question

I am creating an app in which there are custom file types such as .xyz file, which is not part of UTType API.

Here are the case problems:

I want to create a custom UTType with xyz extension.
While opening file app, only those file should be enable which has extension .xyz
The file with xyz extension should show a custom icon on file App.

You can make your own UTIs. See [this](https://stackoverflow.com/questions/24958021/document-types-vs-exported-and-imported-utis) and [this](https://developer.apple.com/documentation/uikit/view_controllers/adding_a_document_browser_to_your_app/setting_up_a_document_browser_app). — Sweeper, May 23 '21 at 05:41
https://developer.apple.com/documentation/uniformtypeidentifiers/uttype/3601077-init — matt, May 23 '21 at 05:58

score 20 · Accepted Answer · answered May 23 '21 at 05:58

You should have mentioned the solutions you tried and it did not work for you.

By the way, there are few steps that you can follow:

Step 1. Create your document type in info.plist

Step 2: Define the exported type identifier in info.plist

Add the same identifier that we added while defining document type, i.e. com.app.xyz
define your extension xyz, XYZ

Step 3: Now while initialising UIDocumentPickerViewController, use the UTtype with identifier you declared in first two steps:

let xyzUTType = UTType("com.app.xyz")
let documentPicker = UIDocumentPickerViewController(forOpeningContentTypes: [xyzUTType], asCopy: true)

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