ios 如何在 Swift 中调用 deinit
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How to call deinit in Swift
提问by Leo
I wrote a code block as the following:
我写了一个代码块如下：
class Person{
let name:String;
init(name:String){
self.name = name;
println("\(name) is being initialized.");
}
deinit{
println("\(name) is being deInitialized.");
}
}
var person:Person?;
person = Person(name:"leo");
person = nil;
When initialized,printis ok. When set person to nil,the deinitmethod is not called.
初始化后，没问题print。将 person 设置为 时nil，deinit不会调用该方法。
回答by matt
The problem is that a playground is not real life. This is just one more reason for not using them (I think they are a terrible mistake on Apple's part). Use a real iOS app project and deinitwill be called as expected.
问题是游乐场不是现实生活。这只是不使用它们的另一个原因（我认为它们是 Apple 的一个可怕的错误）。使用真正的 iOS 应用程序项目并将deinit按预期调用。
Example from a real project:
来自真实项目的示例：
class ViewController: UIViewController {
class Person{
let name:String;
init(name:String){
self.name = name;
println("\(name) is being initialized.");
}
deinit{
println("\(name) is being deInitialized.");
}
}
override func viewDidLoad() {
super.viewDidLoad()
var person:Person?;
person = Person(name:"leo");
person = nil;
}
}
That does what you expect it to do.
这会做你期望它做的事情。
