Some time ago I mentioned the objective-c based ISHPermissionKit for asking users for pre-permissions within iOS apps.
Here’s an open source Swift library called Permission that provides a unified API for dealing with permissions allowing you users to easily set permissions or contacts, the camera, microphones and permissions.
Using Permission you can easily track permissions, and prompt users that they need to change permissions,
Here is an image from the readme showing Permission in action:
You can find Permission on Github here.
A nice Swift library for handling app permissions.
Original article: Open Source Swift Library For Handling App Permissions
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