[英]Swift weakSelf in closure syntax
I have this code to get JSON: 我有这个代码来获取JSON:
Alamofire.request(.GET, worlds).responseJSON { (request, response, JSON, error) in
println(JSON)
//weakSelf.serverList = JSON
}
How to declare weakSelf here? 如何在这里申报weakSelf? I know it should be unowned in my case, but I can't find correct syntax for this. 我知道在我的情况下它应该是无主的,但我找不到正确的语法。 When I try use [unowned self].serverList instead of the commented line, the compiler shows me error "use of unresolved identifier 'unowned'". 当我尝试使用[unowned self] .serverList而不是注释行时,编译器显示错误“使用未解析的标识符'unowned'”。 I also tried to declare constant before block like this: 我也尝试在块之前声明常量,如下所示:
unowned let uSelf = self
It works like a charm, but I want to understand how to use [unowned self] in my case. 它就像一个魅力,但我想了解如何在我的情况下使用[无主自我]。
Use the capture list. 使用捕获列表。 The correct syntax is: 正确的语法是:
Alamofire.request(.GET, worlds).responseJSON { [unowned self] (request, response, JSON, error) in
println(JSON)
self.serverList = JSON
}
However take a note that you are not creating retain cycle here, so you do not have to use weak
or unowned
self here. 但请记住,您不是在这里创建保留周期,因此您不必在此处使用weak
或unowned
。 Good article on this topic: http://digitalleaves.com/blog/2015/05/demystifying-retain-cycles-in-arc/ 关于这个主题的好文章: http : //digitalleaves.com/blog/2015/05/demystifying-retain-cycles-in-arc/
You can declare a weak self reference by putting [weak self]
before your closure parameters. 您可以通过在闭包参数之前放置[weak self]
来声明弱自引用。
You can see the documentation here 您可以在此处查看文档
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