最新 XCode 不编译 UIView 的闭包初始化

Question

我已经为 UIView 添加了少量扩展以用于闭包初始化：

protocol ClosureInitialization: UIView {
    associatedtype View = Self

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

extension ClosureInitialization {

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

extension UIView : ClosureInitialization {}

多亏了它，我可以更轻松地初始化视图，例如：

private lazy var myLabel = UILabel {
    [=12=].text = "Label"
    [=12=].textColor = .myTextColor
    [=12=].font = .myFont
}

升级到XCode13.3 / 13.3.1后，编译停止。我收到的唯一错误消息是：error: Illegal instruction: 4。更重要的是，使用 XCode 13.2.1 一切编译都没有错误。

Answer 1

看起来 Xcode 不喜欢这里的循环继承：ClosureInitialization 继承自 UIView 并且 UIView 声明 ClosureInitialization。

你可以这样写：

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 {
    [=10=].text = "Label"
    [=10=].textColor = .black
}

最新 XCode 不编译 UIView 的闭包初始化

Newest XCode doesn't compile closure initialization for UIView

xcode

ios

swift