Xcode 10 beta2: Cannot invoke initializer for type 'UIView' with no arguments

Question

I have downloaded Xcode 10 beta2 and rebuild my project, codes such as:

let someView = UIView()

come up with the following error:

Cannot invoke initializer for type 'UIView' with no arguments

Pretty strange. Has anybody encountered those building errors when using Xcode 10 beta2?

Answer 1

For me it was reasoned by extending NSObjectProtocol:

extension NSObjectProtocol where Self: UIView

I fixed it by replacing NSObjectProtocol to any other protocol that UIView conforms. In my case it was UIAppearance:

extension UIAppearance where Self: UIView