声明符合Swift2协议的UIView类型的变量-DeclarevariableoftypeUIViewconformingtoaprotocolinSwift2

I need to declare a variable of type UIView which also conforms to MyProtocol:

我需要声明一个UIView类型的变量,它也符合MyProtocol:

protocol MyProtocol: class {
    func foobar()
}

class MyClass {
    var myView: UIView! // Error: Cannot specialize non-generic type 'UIView'
}

However I get the compiler error: Cannot specialize non-generic type 'UIView'.

但是我得到了编译器错误:不能专门化非泛型类型'UIView'。

I need to access methods on the variable from UIView and MyProtocol.

我需要从UIView和MyProtocol访问变量的方法。

What is the correct variable declaration to support these requirements?

支持这些要求的正确变量声明是什么?

If it makes any difference, only UIView subclasses will implement the protocol. Currently I add protocol conformance via extensions.

如果它有任何区别,只有UIView子类才会实现该协议。目前,我通过扩展添加协议一致性。

I found this answer: https://stackoverflow.com/a/25771265/233602 but it's not clear if that answer is still the best option going in when writing in Swift 2.

我找到了这个答案:https://stackoverflow.com/a/25771265/233602但不清楚在Swift 2中写这个答案是否仍然是最好的选择。

2 个解决方案

protocol MyProtocol: class {
    func foobar()
}

class MyClass {
    var myView: T!
}

protocol UIViewType {
    var view: UIView { get }
}

extension UIView: UIViewType {
    var view: UIView { return self }
}

// the variable
var myView: protocol