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

问题

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?

回答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

回答2:

try this

let someView = UIView(frame: CGRect.zero)

it works for me

回答3:

Just add the "frame" argument: UIView(frame: CGRect.zero) (or whatever you need it to be)

In my code I set up the Views like this and later I add constraints (which basically override frame parameters).

The same works for UIView, UILabel, UIScrollView and others... For UIButtons, add the "type" argument instead: UIButton(type: UIButtonType.custom)

回答4:

After hours of debugging I have finally found the problem.

I use a pod SwiftTheme, after upgrading it to a new version those errors have gone.

See this commit.

来源：https://stackoverflow.com/questions/51124370/xcode-10-beta2-cannot-invoke-initializer-for-type-uiview-with-no-arguments