从闭包内部改变结构的 属性

Question

我正在尝试在结构中的变异函数内编写闭包，并从闭包内部更改一个 属性 结构。但它给我的错误如下：

"Escaping closure captures mutating 'self' parameter "

struct Sample {
  var a = "Jonh Doe"

  mutating func sample() {
    let closure = { () in
      self.a = "eod hnoj"
    }
    print(closure)
    print(a)
  }
}

var b = Sample()
b.sample()

Answer 1

尝试下面的示例代码。

struct Sample {
  var a = "Jonh Doe"

  mutating func sample() {
    let closure = {
        Sample(a: "eod hnoj")
    }
    self = closure()
  }
}

var b = Sample()
b.sample()
print(b)