swift – 覆盖didSet

发布时间：2020-12-14 04:35:37 所属栏目：百科来源：网络整理

导读：我想覆盖属性观察者并调用“super.didSet”.那可能吗？ class Foo { var name: String = "" { didSet { print("name has been set") } }}class Bar: Foo { override var name: String = "" { didSet { print("print this first") // print the line set in t

我想覆盖属性观察者并调用“super.didSet”.那可能吗？

class Foo {
    var name: String = "" { didSet { print("name has been set") } }
}

class Bar: Foo {
    override var name: String = "" { 
        didSet { 
            print("print this first")
            // print the line set in the superclass
        }
    }
}

解决方法

我已经在游乐场尝试了你的代码并得到了错误

Variable with getter/ setter cannot have and initial value.

所以我只是从orverriding变量中删除了=“”.如下：

class Foo {
    var name: String = "" { didSet { print("name has been set") } }
}

class Bar: Foo {
    override var name: String  {
        didSet {
            print("print this first")
            // print the line set in the superclass
        }
    }
}

let bar = Bar()
bar.name = "name"

这就是我在康复中所得到的：

name has been set
print this first

（编辑：李大同）

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