Permissions.swift

Permissions.swift is an elegant API to read and request permissions on iOS. At the moment, the following permissions are supported:

• camera
• notifications

Feel free to submit issues or pull requests if you need other types of permissions.

Example

class AppDelegate: UIResponder, UIApplicationDelegate {
    func application(_ application: UIApplication, didFinishLaunchingWithOptions…) -> Bool {
        let permissions = Permissions()
        permissions.notificationOptions = [.alert]
		
        let viewController = OnboardingViewController(permissions: permissions)
        …
    }
}

class OnboardingViewController: UIViewController {
    init(permissions: Permissions) { … }

    func didTapContinueButton() {
        if self.permissions[.notifications] == .unknown {
            self.permissions.request(for: .notifications) { status in
                … // callback is always on the main queue
            }
        } else {
            …
        }
    }
}

Why?

Permissions.swift provides a simple, unified and testable wrapper around permissions. Its enum-based API makes your code more readable and by abstracting permissions into a separate class more testable.

When testing your app, you can simply inject a mock-Permissions object that doesn’t actually read/request iOS permissions, but instead behaves in a way that is suitable for your test.

class OnboardingTests: XCTestCase {
    func testPermissionDenied() {
        let permissions = MockPermissions()
        permissions.onRequest = { $0.status = .denied }

        let viewController = OnboardingViewController(permissions: permissions)
        …
    }
}

class MockPermissions: Permissions {
    var status = PermissionStatus.unknown
    var onRequest: ((MockPermissions) -> Void)?
    
    override func status(`for` type: PermissionType) -> PermissionStatus {
        return self.status
    }
    
    override func request(`for` type: PermissionType, completion: @escaping (PermissionStatus) -> Void) {
        self.onRequest?(self)
        completion(self.status)
    }
}

Installation

It’s just a single .swift file. If you feel the need to use Carthage or Cocoapods, please submit a pull request.

Who?

@fabianehlert and I, @floschliep, created this while working on Cheese.

License

Permissions.swift is available under the MIT license. See the LICENSE file for more info.