Swift - 使用未解析的标识符'self' - 来自类中的Closure(Swift - Use of unresolved identifier 'self' - from Closure in a Class)

 我正在尝试从我的课程中声明的闭包中引用我的课程中的某个属性。 我无法从闭包中访问自己，我假设自己会在我的闭包中引用类API。 
 
 我想声明一个闭包，我稍后使用它作为参数传递给URLSession dataTask（它在没有一个错误行的情况下工作）。 我在标题中列出了错误。 
 
 
 
 使用未解析的标识符'self' 
 
 
 我现在一直在写一整天，而且只是将其作为一个沙箱来试用，所以我完全期待一些批评。 
 
class Api {

    struct Location {
        var name = String()
        var author = String()
        var averageRating: String?
        var id = Int()
        var lat = Double()
        var lon = Double()
        var type = String()
    }

    var locations = [Location]()

    var doSomething = {(data: Data?, response: URLResponse?, error: Error?) -> Void in
        if error != nil {
            print(error!.localizedDescription)
        } else {
            do {
                if let json = try JSONSerialization.jsonObject(with: data!, options: .allowFragments) as? [String: Any] {
                    let myResult = json["results"] as! [[String: Any]]
                    var location : Location! = Location()
                    for jsonLocation in myResult {
                        if let name = jsonLocation["name"]{location.name = name as! String}
                        if let author = jsonLocation["author"]{location.author = author as! String}
                        if let id = jsonLocation["id"]{location.id = id as! Int}
                        if let lat = jsonLocation["lat"]{location.lat = lat as! Double}
                        if let lon = jsonLocation["lon"]{location.lon = lon as! Double}
                        if let type = jsonLocation["type"]{location.type = type as! String}

                        //ERROR IS HERE, Why does self not reference class API?
                        self.locations.append(location)
                    }
                }
            } catch {
                print("error in JSONSerialization")
            }
        }
    }
}
 
 我发现了这个 ，但这个例子是不同的，所以我不确定它是否是相同的错误，或者我没有迅速理解。 

I am trying to reference a property in my class from a closure declared in my class. I cannot access self from inside my closure, and I'm assuming self would refer to the Class API from within my closure. 
 
I want to declare a closure that I use later as a parameter to pass to a URLSession dataTask (It works without the one error line). I get the error listed in the title. 
 
 
 
Use of unresolved identifier 'self'
 
 
I've been writing swift for an entire day now and am just trying things out as a sandbox, so I fully expect some criticism. 
 
class Api {

    struct Location {
        var name = String()
        var author = String()
        var averageRating: String?
        var id = Int()
        var lat = Double()
        var lon = Double()
        var type = String()
    }

    var locations = [Location]()

    var doSomething = {(data: Data?, response: URLResponse?, error: Error?) -> Void in
        if error != nil {
            print(error!.localizedDescription)
        } else {
            do {
                if let json = try JSONSerialization.jsonObject(with: data!, options: .allowFragments) as? [String: Any] {
                    let myResult = json["results"] as! [[String: Any]]
                    var location : Location! = Location()
                    for jsonLocation in myResult {
                        if let name = jsonLocation["name"]{location.name = name as! String}
                        if let author = jsonLocation["author"]{location.author = author as! String}
                        if let id = jsonLocation["id"]{location.id = id as! Int}
                        if let lat = jsonLocation["lat"]{location.lat = lat as! Double}
                        if let lon = jsonLocation["lon"]{location.lon = lon as! Double}
                        if let type = jsonLocation["type"]{location.type = type as! String}

                        //ERROR IS HERE, Why does self not reference class API?
                        self.locations.append(location)
                    }
                }
            } catch {
                print("error in JSONSerialization")
            }
        }
    }
}
 
I have found this, but this example is different so I wasn't sure if it was the same bug or me not understanding swift.

原文：https://stackoverflow.com/questions/43870954