从任何 VC 获取协议定义的变量值

Question

协议（我的协议）：-

 protocol myProtocol {
        var type:String { get set }
        var sub:String { get }
        var msg:String? { get set }
    }

Class(myVC):-

class myVC: UIViewController, myProtocol {
    //Protocol Declarations
    var sub  = myTypes.type.rawValue
    var type = myTypes.type.getType()
    var msg :String?

.... }

分机：-

extension UIViewController
{
 func getData() {
        if self is myProtocol {
         let msg = self.msg

        } }
}

在 'self.msg' 出现错误说 Value of type UIViewController has no member 'sub'

我该怎么做？感谢任何帮助。

Answer 1

根据您的示例，您需要更改您的扩展定义

extension UIViewController

作为

extension myVC

Answer 2

您需要做的就是在您的扩展中再写一行代码 class。我刚刚对它进行了测试，它对我有用。这是我写的代码 -

extension UIViewController
{
    func getData() {
        if self is myProtocol {
            let x = self as! myProtocol
            let msg = x.msg
            print(x.msg)
        }
    }
}

从任何 VC 获取协议定义的变量值

Get values of variables defined by protocol from any VC

ios

swift2

swift-protocols

swift-extensions