對象不釋放

Question

的夫特編程語言導具有以下示例：

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 

據預計在DEINIT（）方法來打印出字符串，但它沒有印刷任何東西。這對我來說意味着對象仍然存在，並且與關閉有很強的參照週期。有沒有人得到同樣的問題？

Answer 1

記住弱捕獲，而不是無主

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