Newest XCode doesn't compile closure initialization for UIView-CodePudding

I've added handful extension to UIView for closure initialization:

protocol ClosureInitialization: UIView {
    associatedtype View = Self

    init(_ configurationClosure: (View) -> ())
}

extension ClosureInitialization {

    init(_ configurationClosure: (Self) -> ()) {
        self.init(frame: .zero)
        configurationClosure(self)
    }
}

extension UIView : ClosureInitialization {}

Thanks to it, I can initialize views more easily, e.g.:

private lazy var myLabel = UILabel {
    $0.text = "Label"
    $0.textColor = .myTextColor
    $0.font = .myFont
}

After upgrading to XCode 13.3 / 13.3.1, it stopped compiling. The only error message I get is: error: Illegal instruction: 4. What's more, using XCode 13.2.1 everything compiles without an error.

CodePudding user response：

Looks like Xcode doesn't like circular inheritance here: ClosureInitialization is inherited from UIView and UIView declares ClosureInitialization.

You can write it like this instead:

protocol ClosureInitialization {
    associatedtype View = Self

    init(_ configurationClosure: (View) -> ())
}

extension ClosureInitialization where Self: UIView {

    init(_ configurationClosure: (Self) -> ()) {
        self.init(frame: .zero)
        configurationClosure(self)
    }
}

extension UIView: ClosureInitialization {}

var myLabel = UILabel {
    $0.text = "Label"
    $0.textColor = .black
}