Easier interaction between UIImage and assets

We all hate explicitly typed strings, especially for creating UIImages, but we can surely improve on that. Let’s start with an enum, that has a var to transform its raw value into an UIImage:

enum Asset: String { 
   case back = "leftArrow" 
   case logo 
   case email 
   case briefcase 
   
   // A bang isn'tthat bad here,  
   // as we should be 100% sure of what goes in this enum 
   
   var image: UIImage { 
      return UIImage(named: rawValue)!
   } 
}

And why not improve UIImageView too, while we’re at it?

extension UIImageView { 
   convenience init(asset: Asset) { 
      self.init(image: asset.image) 
   } 
}

Now, by having autocomplete, our calls are easier, and safer:

let backImage = Asset.back.image 
let emailImage = Asset.logo.image 
let logoImageView = UIImageView(asset: .logo) 
let briefcaseImageView = UIImageView(asset: .briefcase)

Originally published at rolandleth.com.