Swift how to add 5 star ratings for users to vote using Firebase

I'm creating a restaurant rating app in Swift that allows its users to rate restaurants on a 5-star rating scale (just like Zomato and Yelp) .
I will be using Firebase to store each user's rating for a specific restaurant and then take the average of user ratings and display it in the app. There will be a star rating corresponding to each tableview cell (every tableview cell corresponds to a restaurant) .

However I'm stuck deeply on the project. I can't figure out how to add the user's rating to the database. My app won't require a user sign-up or login page, users can directly rate restaurants. This being said, also, how can I make sure that users can vote only once for a single restaurant? I'd appreciate any help! Thank you in advance.

Here is my code so far:

var starsRating = 0
var starsEmptyPicName = "star" // can change to empty star picture name
var starsFilledPicName = "starfill" // can change to filled star picture name
override func draw(_ rect: CGRect)
let starButtons = self.subviews.filter$0 is UIButton
var starTag = 1
for button in starButtons
if let button = button as? UIButton
button.setImage(UIImage(named: starsEmptyPicName), for: .normal)
button.addTarget(self, action: #selector(self.pressed(sender:)), for: .touchUpInside)
button.tag = starTag
starTag = starTag + 1


setStarsRating(rating:starsRating)


func setStarsRating(rating:Int)
self.starsRating = rating
let stackSubViews = self.subviews.filter$0 is UIButton
for subView in stackSubViews
if let button = subView as? UIButton
if button.tag > starsRating
button.setImage(UIImage(named: starsEmptyPicName), for: .normal)
else
button.setImage(UIImage(named: starsFilledPicName), for: .normal)





@objc func pressed(sender: UIButton)
setStarsRating(rating: sender.tag)


}


And here are my tableview functions:

func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int
return identifiers.count //identifiers is my big restaurants array




func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell

let cell = UITableViewCell(style: UITableViewCellStyle.default, reuseIdentifier: "CellThree")
cell.textLabel!.text = identifiers[indexPath.row]
return cell



1 Answer
1

I would use CoreData to save if user already vote.

When the user rate one of the restaurant, just create a new record in core data with the restaurant's name or ID.

Before every vote I should check if data is existing or not. If not, user can vote.

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