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https://stackoverflow.com/questions/39631256/request-permission-for-camera-and-library-in-ios-10-info-plist/39631642

// Properties List
Key       :  Privacy - Photo Library Usage Description    
Value     :  $(PRODUCT_NAME) photo use

// Check status
let photos = PHPhotoLibrary.authorizationStatus()
if photos == .notDetermined {

}
    
// Request permission
PHPhotoLibrary.requestAuthorization({status in
    if status == .authorized{
        ...
    } else {}
})