swift - 如何使用一个变量/属性而不是将同一属性赋值三次？

Question

假设 myVar 在 View 的每个实现中都具有相同 的功能。我试图弄清楚如何声明/公开某种仅设置属性，而不是将它们分配 n 次(每创建一个新的 View )，但没有任何结果到我头上。我如何重构为一条线和一次分配？

var myVar: (()-> Void)?

private func callBack() {
    someClass.view1.myVar = self.myVar
    someClass.view2.myVar = self.myVar
    someClass.view3.myVar = self.myVar
}

// MARK: - someClass pseudocode

someClass: class {
    let view1: CustomView: = CustomView
    let view2: CustomView: = CustomView
    let view3: CustomView: = CustomView
}

// MARK: - customView pseudocode

class CustomView: UIView {
    var myVar: (()-> Void)?
}

Answer 1

类似这样，但是将所有 CustomViews 放在一个数组中是个好主意，也可以在这里实现

var a: (() -> Void)?

class CustomView: UIView {
    var myVar: (() -> Void)?
}

class SomeClass {
    let view1 = CustomView()
    let view2 = CustomView()
    let view3 = CustomView()
    var myVar: (() -> Void)? {
        set {
            self.view2.myVar = newValue
            self.view1.myVar = newValue
            self.view3.myVar = newValue
        }

        get {
            return self.myVar
        }
    }
}

let b = SomeClass()
b.myVar = ({print(3)})
b.view1.myVar!()