对象不释放

Question

的夫特编程语言导具有以下示例：

class HTMLElement { 

    let name: String 
    let text: String? 

    @lazy var asHTML:() -> String = { 
     [unowned self] in 
     if let text = self.text { 
      return "<\(self.name)>\(text)</\(self.name)>" 
     } else { 
      return "<\(self.name) />" 
     } 
    } 

    init(name: String, text: String? = nil) { 
     self.name = name 
     self.text = text 
    } 

    deinit { 
     println("\(name) is being deinitialized") 
    } 

} 
var paragraph:HTMLElement? = HTMLElement(name: "p", text: "hello, world") 
println("\(paragraph!.asHTML())") 
paragraph = nil 

据预计在DEINIT（）方法来打印出字符串，但它没有印刷任何东西。这对我来说意味着对象仍然存在，并且与关闭有很强的参照周期。有没有人得到同样的问题？

Answer 1

记住弱捕获，而不是无主

class HTMLElement { 

    let name: String 
    let text: String? 

    @lazy var asHTML:() -> String = { 
     [weak self] in 
     if let text = self?.text { 
      return "<\(self?.name)>\(text)</\(self?.name)>" 
     } else { 
      return "<\(self?.name) />" 
     } 
    } 

    init(name: String, text: String? = nil) { 
     self.name = name 
     self.text = text 
    } 

    deinit { 
     println("\(name) is being deinitialized") 
    } 

} 
var paragraph:HTMLElement? = HTMLElement(name: "p", text: "hello, world") 
println("\(paragraph!.asHTML())") 
paragraph = nil