YelpRatings.swift

//1 Download the assets
https://www.yelp.com/developers/display_requirements

//2 enum to enumerate assets
enum ReviewIcon: NSNumber {
    
    case zeroStar
    case oneStar
    case oneAndHalfStar
    case twoStar
    case twoAndHalfStar
    case threeStar
    case threeAndHalfStar
    case fourStar
    case fourAndHalfStar
    case fiveStar
    case unexpectedReview
    
    init(reviewNumber: NSNumber) {
        
        print(reviewNumber)
        switch reviewNumber {
        case 0 : self = .zeroStar
        case 1 : self = .oneStar
        case 1.5: self = .oneAndHalfStar
        case 2 : self = .twoStar
        case 2.5 : self = .twoAndHalfStar
        case 3 : self = .threeStar
        case 3.5 : self = .threeAndHalfStar
        case 4 : self = .fourStar
        case 4.5 : self = .fourAndHalfStar
        case 5 : self = .fiveStar
        default: self = .unexpectedReview
        }
    }
}

extension ReviewIcon {
    
    var image : UIImage {
        switch self {
        case .zeroStar: return #imageLiteral(resourceName: "large_0")
        case .oneStar: return #imageLiteral(resourceName: "large_1")
        case .oneAndHalfStar: return #imageLiteral(resourceName: "large_1_half")
        case .twoStar: return #imageLiteral(resourceName: "large_2")
        case .twoAndHalfStar: return #imageLiteral(resourceName: "large_2_half")
        case .threeStar: return #imageLiteral(resourceName: "large_3")
        case .threeAndHalfStar: return #imageLiteral(resourceName: "large_3_half")
        case .fourStar: return #imageLiteral(resourceName: "large_4")
        case .fourAndHalfStar: return #imageLiteral(resourceName: "large_4_half")
        case .fiveStar: return #imageLiteral(resourceName: "large_5")
        case .unexpectedReview: return #imageLiteral(resourceName: "large_0")
        }
    }
}

//3 how to use it
//create an instance of ReviewIcon using the custom initializer and passing the value of the business rating

   let reviewIcon = ReviewIcon(reviewNumber: business.rating)
   
 //  assing the image to your imageView
 
   ratingView.image = reviewIcon.image