ios – 在元素添加/删除到阵列时收到通知

private var privateWord: String?
var word: String? {
    get {
        return privateWord
    }
    set {
        if newValue != "" {
            notifyThatWordIsChanged()
        } else {
            notifyThatWordIsEmpty()
        }
        privateWord = newValue
    }
}

您可以创建类似于class / struct的代理,它将具有与array相同的接口,将在场景下存储标准数组并代表store数组.这是一个小例子：

struct ArrayProxy<T> {
    var array: [T] = []

    mutaTing func append(newElement: T) {
        self.array.append(newElement)
        print("Element added")
    }

    mutaTing func removeATindex(index: int) {
        print("Removed object \(self.arraY[index]) at index \(indeX)")
        self.array.removeATindex(indeX)
    }

    subscript(index: int) -> T {
        set {
            print("Set object from \(self.arraY[index]) to \(newvalue) at index \(indeX)")
            self.arraY[index] = newValue
        }
        get {
            return self.arraY[index]
        }
    }
}

var a = ArrayProxy<Int>()
a.append(1)